英制 美制及公制螺纹基本尺寸及公差
普通的公制、英制、美制螺纹计算公式，附最新英制螺纹对照表
普通的公制、英制、美制螺纹计算公式，附最新英制螺纹对照表公制螺纹(MM牙)牙深=0.6495*牙距P(牙角60度)内牙孔径= 公称直径-1.0825*PM20x2.5-6H/7g (右手)-(单头螺纹)-(公制粗牙)(公称直径20mm) (牙距2.5mm)(内螺纹配合等级6H)(外螺纹配合等级7g)左-双头-M20x1.5 (左手)-(双头螺纹)-(公制细牙)(公称直径20mm) (牙距1.5mm)美制螺纹(统一标准螺纹)牙深= 0.6495*(25.4/每吋牙数)(牙角60度)3/4-10UNC-2A(UNC粗牙)(UNF细牙)(1A 2A 3A 外牙公差配合等级)(1B 2B 3B 内牙公差配合等级)UNC美制统一标准粗牙螺纹外径3/4英吋,每英吋10牙外牙 2级公差配合管螺纹(英制PT)牙深= 0.6403*(25.4/每吋牙数)(牙角55度)PT 3/4-14 (锥度管螺纹) 锥度管螺纹,锥度比1/16 3/4英吋管用,每英吋14牙螺纹(PS直螺纹)(PF细牙)牙深= 0.6403*(25.4/每吋牙数)(牙角55度)PS 3/4-14 (直形管螺纹)PF1 1/8-16 (直形管螺纹)(细牙)直形管螺纹3/4英吋管用,每英吋14牙1 1/8英吋管用,每英吋16牙管螺纹(美制NPT)(牙角60度)NPT 3/4-14 (锥形管螺纹) 锥形管螺纹,锥度比1/16 3/4英吋管用,每英吋14牙梯形螺纹(30度公制)TM40*6 公称直径40mm 牙距6.0mm梯形螺纹(29度爱克姆螺纹)TW26*5 外径26mm,每英吋5牙方形螺纹车牙的计算考虑条件计算公式公制牙与英制牙的转换每吋螺纹数 n = 25.4 / 牙距 P牙距 P = 25.4 / 每吋螺纹数 n因为工件材料及刀具所决定的转速转速 N = (1000周速 V ) / (圆周率 p * 直径 D )因为机器结构所决定的转速刀座快速移动的影响车牙最高转速 N = 4000/ P刀座快速移动加减速的影响下刀点与退刀点的计算(不完全牙的计算) 下刀最小距离 L1L1 = (牙距 P ) * (主轴转速 S ) / 500退刀最距离 L2L2 = (牙距 P ) * (主轴转速 S ) / 2000牙深及牙底径d 牙深 h =0.6495 * P牙底径 d =公称外径 D - 2 * h例题：车制外牙3/4'-10UNC 20mm长公制牙与英制牙的转换牙距 P = 25.4 / (吋螺纹数 n)P = 25.4 / 10 = 2.54mm因为工件材料及刀具所决定的转速外径 D = 3 / 4英吋 = 25.4 * (3/4) =19.05MM转速 N = (1000周速V) / (圆周率 p * 直径 D )N = 1000V / pD = 1000 * 120 / (3.1416*19.05)=2005 rpm (转/分)因为机器结构所决定的转速刀座快速移动的影响车牙最高转速 N =4000 / PN = 4000/2.54 = 1575 rpm综合工件材料刀具及机械结构所决定的转速 N = 1575 转N = 2005转两者转速选择较低者,即1575转刀座快速移动加减速的影响下刀点与退刀点的计算(不完全牙的计算) 下刀最小距离 L1L1 = (牙距P) * (主轴转速S) / 500L1 = 2.54*1575/500=8.00mm退刀最小距离 L2L2 = (牙距P) * (主轴转速S) / 2000L2 = 2.54*1575/2000=2.00mm牙深及牙底径d 牙深径d = 公称外径D-2*h =19.05-2*1.65 = 15.75mm附表：英制普通螺纹(惠氏螺纹) -- 小螺纹系列(BA)名义尺寸牙型代号大径螺距每英寸牙数中径小径牙型高底孔直径BA mm mm tpi mm 外螺纹H1 mmd=D p d2=D2 d3No. 14 BA 1 0.23 110.4 0.86 0.72 0.14 0.75 No. 13 BA 1.2 0.25 101.6 1.05 0.9 0.15 0.95 No. 12 BA 1.3 0.28 90.71 1.13 0.96 0.17 1 No. 11 BA 1.5 0.31 81.93 1.315 1.13 0.185 1.2 No. 10 BA 1.7 0.35 72.57 1.49 1.28 0.21 1.35 No. 9 BA 1.9 0.39 65.12 1.665 1.43 0.235 1.5 No. 8 BA 2.2 0.43 59.07 1.94 1.68 0.26 1.8 No. 7 BA 2.5 0.48 52.92 2.21 1.92 0.29 2 No. 6 BA 2.8 0.53 47.92 2.48 2.16 0.32 2.3 No. 5 BA 3.2 0.59 43.05 2.845 2.49 0.355 2.6 No. 4 BA 3.6 0.66 38.48 3.205 2.81 0.395 2.95 No. 3 BA 4.1 0.73 34.79 3.66 3.22 0.44 3.4 No. 2 BA 4.7 0.81 31.35 4.215 3.73 0.485 3.9 No. 1 BA 5.3 0.9 28.22 4.76 4.22 0.54 4.4No. 0 BA 6 1 25.4 5.4 4.8 0.6 5 55°圆锥管螺纹型式和尺寸（2006-03-13 14:38:47 ）螺纹代号基本尺寸大径螺距每英寸牙数中径小径牙型高度圆弧尺寸底英寸mm mm tpi mm 外螺纹H1 r mm d=D p d2=D2 d3R 1/16 1/16＂7.723 0.907 28 7.142 6.561 0.581 0.125 6. R 1/8 1/8＂9.728 0.907 28 9.147 8.566 0.581 0.125 8. R 1/4 1/4＂13.157 1.337 19 12.301 11.445 0.856 0.184 11 R 3/8 3/8＂16.662 1.337 19 15.806 14.95 0.856 0.184 14 R 1/2 1/2＂20.955 1.814 14 19.793 18.631 1.162 0.249 18 R 3/4 3/4＂26.441 1.814 14 25.279 24.117 1.162 0.249 23 R 1 1＂33.249 2.309 11 31.77 30.291 1.479 0.317 30 R 1 1/4 1 1/4＂ 41.91 2.309 11 40.431 38.952 1.479 0.317 38 R 1 1/2 1 1/2＂ 47.803 2.309 11 46.324 44.845 1.479 0.317 44 R 2 2＂59.614 2.309 11 58.135 56.656 1.479 0.317 56 R 2 1/2 2 1/2＂ 75.184 2.309 11 73.705 72.226 1.479 0.317 71 R 3 3＂87.884 2.309 11 86.405 84.926 1.479 0.317 85 R 4 4＂113.03 2.309 11 111.551 110.072 1.479 0.317 11 R 5 5＂138.43 2.309 11 136.951 135.472 1.479 0.317 13 R 6 6＂163.83 2.309 11 162.351 160.872 1.479 0.317 16制惠氏螺纹的型式尺寸英制普通螺纹(惠氏螺纹) -- 粗牙(BSW)名义尺寸牙型代号大径螺距每英寸牙数中径小径牙型高底孔直径Ww mm mm tpi mm 外螺纹H1 mmd=D p d2=D2 d31/16＂BSW 1.587 0.423 60 1.315 1.05 0.27 1.15 3/32＂BSW 2.381 0.529 48 2.041 1.703 0.338 1.9 1/8＂BSW 3.175 0.635 40 2.768 2.362 0.406 2.5 5/32＂BSW 3.969 0.793 32 3.459 2.952 0.507 3.2 3/16＂BSW 4.762 1.058 24 4.084 3.407 0.677 3.7 7/32＂BSW 5.556 1.058 24 4.878 4.201 0.677 4.5 1/4＂BSW 6.35 1.27 20 5.537 4.724 0.813 5.1 5/16＂BSW 7.938 1.411 18 7.034 6.131 0.904 6.53/8＂BSW 9.525 1.588 16 8.509 7.492 1.017 7.9 7/16＂BSW 11.113 1.814 14 9.951 8.789 1.162 9.2 1/2＂BSW 12.7 2.117 12 11.345 9.99 1.355 10.4 5/8＂BSW 15.876 2.309 11 14.397 12.918 1.479 13.4 3/4＂BSW 19.051 2.54 10 17.424 15.798 1.627 16.25 7/8＂BSW 22.226 2.822 9 20.419 18.611 1.807 19.25 1＂BSW 25.4 3.175 8 23.368 21.335 2.033 221 1/8＂BSW 28.576 3.629 7 26.253 23.929 2.324 24.5 1 1/4＂BSW 31.751 3.629 7 29.428 27.104 2.324 27.25 1 3/8＂BSW 34.926 4.233 6 32.215 29.505 2.711 30.25 1 1/2＂BSW 38.1 4.233 6 35.391 32.68 2.711 33.5 1 5/8＂BSW 41.277 5.08 5 38.024 34.771 3.253 35.5 1 3/4＂BSW 44.452 5.08 5 41.199 37.946 3.253 38.5 1 7/8＂BSW 47.627 5.6454 1/2 44.012 40.398 3.614 41.25 2＂BSW 50.802 5.645 4 1/2 47.187 43.573 3.614 44.5 2 1/4＂BSW 57.152 6.35 4 53.086 49.02 4.066 502 1/2＂BSW 63.502 6.35 4 59.436 55.37 4.066 562 3/4＂BSW 69.853 7.257 3 1/2 65.205 60.558 4.647 61.5 3＂BSW 76.203 7.257 3 1/2 71.556 66.909 4.647 683 1/4＂BSW 82.553 7.816 3 1/4 77.548 72.544 5.005 73.75 3 1/2＂BSW 88.903 7.816 3 1/4 83.899 78.894 5.005 803 3/4＂BSW 95.254 8.467 3 89.832 84.41 5.422 85.5 4＂BSW 101.604 8.467 3 96.182 90.76 5.422 924 1/4＂BSW 107.954 8.835 2 7/8 102.297 96.639 5.657 984 1/2＂BSW 114.304 8.835 2 7/8 108.647 102.99 5.657 104.2 4 3/4＂BSW 120.665 9.237 2 3/4 114.74 108.625 5.915 110 5＂BSW 127.005 9.237 2 3/4 121.09 115.176 5.915 116.5 5 1/4＂BSW 133.355 9.677 2 5/8 127.159 120.963 6.196 122.5 5 1/2＂BSW 139.705 9.677 2 5/8 133.509 127.313 6.196 128.5 5 3/4＂BSW 146.055 10.16 2 1/2 139.549 133.043 6.506 134.5 6＂BSW 152.406 10.16 2 1/2 145.9 139.394 6.506 141 英制普通螺纹-- 细牙-- BSF英制普通螺纹(惠氏螺纹) -- 细牙(BSW)名义尺寸牙型代号大径螺距每英寸牙数中径小径牙型高底孔直径BSF mm mm tpi mm 外螺纹H1 mm d=D p d2=D2 d33/16 BSF 4.763 0.794 32 4.255 3.747 0.508 47/32 BSF 5.556 0.907 28 4.975 4.394 0.581 4.6 1/4 BSF 6.35 0.977 26 5.725 5.1 0.625 5.3 9/32 BSF 7.142 0.977 26 6.518 5.893 0.625 6.1 5/16 BSF 7.938 1.156 22 7.199 6.459 0.739 6.8 3/8 BSF 9.525 1.27 20 8.712 7.899 0.813 8.3 7/16 BSF 11.113 1.411 18 10.209 9.304 0.904 9.7 1/2 BSF 12.7 1.588 16 11.684 10.668 1.017 11.1 9/16 BSF 14.288 1.588 16 13.272 12.256 1.017 12.7 5/8 BSF 15.875 1.814 14 14.712 13.549 1.162 1411/16 BSF 17.463 1.814 14 16.3 15.137 1.162 15.5 3/4 BSF 19.05 2.117 12 17.693 16.336 1.355 16.75 13/16 BSF 20.638 2.117 12 19.281 17.924 1.355 18.25 7/8 BSF 22.225 2.309 11 20.747 19.269 1.479 19.75 1.00 BSF 25.4 2.54 10 23.774 22.148 1.627 22.75 1 1/8 BSF 28.575 2.822 9 26.769 24.963 1.807 26.5 1 1/4 BSF 31.75 2.822 9 29.944 28.138 1.807 28.75 1 3/8 BSF 34.925 3.175 8 32.893 30.861 2.033 31.5 1 1/2 BSF 38.1 3.175 8 36.068 34.036 2.033 34.5 1 5/8 BSF 41.275 3.175 8 39.243 37.211 2.033 381 3/4 BSF 44.45 3.629 7 42.126 39.802 2.324 40.52 BSF 50.8 3.629 7 48.476 46.152 2.324 472 1/4 BSF 57.15 4.234 6 54.44 51.73 2.711 532 1/2 BSF 63.5 4.234 6 60.79 58.08 2.711 592 3/4 BSF 69.85 4.234 6 67.14 64.43 2.711 -3 BSF 76.2 5.08 5 72.946 69.692 3.253 -3 1/4 BSF 82.55 5.08 5 79.296 76.042 3.253 -3 1/2 BSF 88.9 5.6454 1/2 85.285 81.67 3.614 -3 3/4 BSF 95.25 5.645 4 1/2 91.635 88.02 3.614 -4 BSF 101.6 5.645 4 1/2 97.985 94.37 3.614 -4 1/4 BSF 107.95 6.35 4 103.886 99.822 4.066 - 55°圆柱管螺纹的型式和尺寸British Pipe Thread (惠氏管螺纹) -- 圆柱(BSPP/BSPF)螺纹代号基本尺寸大径螺距每英寸牙数中径小径牙型高度底孔尺寸mm mm tpi mm 外螺纹H1 mmd=D p d2=D2 d3G 1/8 1/8＂9.728 0.907 28 9.147 8.566 0.581 8.7 G 1/4 1/4＂13.157 1.337 19 12.301 11.445 0.856 11.6 G 3/8 3/8＂16.662 1.337 19 15.806 14.95 0.856 15G 1/2 1/2＂20.955 1.814 14 19.793 18.631 1.162 19G 5/8 5/8＂22.911 1.814 14 21.749 20.587 1.162 20.75 G 3/4 3/4＂26.441 1.814 14 25.279 24.117 1.162 24.5 G 7/8 7/8＂30.201 1.814 14 29.039 27.877 1.162 28G 1 1＂33.249 2.309 11 31.77 30.291 1.479 30.5 G 1 1/8 1 1/8＂ 37.897 2.309 11 36.418 34.939 1.479 35G 1 1/4 1 1/4＂ 41.91 2.309 11 40.431 38.952 1.479 39.5 G 1 3/8 1 3/8＂ 44.323 2.309 11 42.844 41.365 1.479 41.5 G 1 1/2 1 1/2＂ 47.803 2.309 11 46.324 44.845 1.479 45G 1 3/4 1 3/4＂ 53.746 2.309 11 52.267 50.788 1.479 51G 2 2＂59.614 2.309 11 58.135 56.656 1.479 57G 2 1/4 2 1/4＂ 65.71 2.309 11 64.231 62.752 1.479 63G 2 1/2 2 1/2＂ 75.184 2.309 11 73.705 72.226 1.479 72.5 G 2 3/4 2 3/4＂ 81.534 2.309 11 80.055 78.576 1.479 79G 3 3＂87.884 2.309 11 86.405 84.926 1.479 85.5 G 3 1/4 3 1/4＂ 93.98 2.309 11 92.501 91.022 1.479 91G 3 1/2 3 1/2＂ 100.33 2.309 11 98.351 97.372 1.479 97.75 G 3 3/4 3 3/4＂ 106.68 2.309 11 105.201 103.722 1.479 104 G 4 4＂113.03 2.309 11 111.55 110.072 1.479 110.5 G 4 1/2 4 1/2＂ 125.73 2.309 11 124.251 122.772 1.479 123 G 5 5＂138.43 2.309 11 136.951 135.472 1.479 136 G 5 1/2 5 1/2＂ 151.13 2.309 11 149.651 148.172 1.479 148.5 G 6 6＂163.83 2.309 11 162.351 160.872 1.479 161.5RC2英寸锥管螺纹，每英寸11牙，螺距=25.4/11即2.309，牙高（深）=2.309×0.64即1.479，锥度是固定的即1：16R等于1/32乘以长度1/32意思是，锥螺纹的锥度是1：16 ，单边就是1：32长度意思是：定位点加有效长度比如我定位3.0，有效长度是12.0R=1/32 X（3+12）=0.468751、密封管螺纹（R）英制密封管螺纹的基本尺寸及其公差配合方式英制密封管螺纹有两种配合方式：圆柱内螺纹与圆锥外螺纹组成“柱/锥”配合；圆锥内螺纹与圆锥外螺纹组成“锥/锥”配合.欧洲国家主要采用“柱/锥”配合螺纹；而欧洲以外国家则主要采用“柱/锥”配合螺纹.两种螺纹的检验量规存在一定不同；目前的ISO 英制密封管螺纹量规标准（ISO 7-2：2000）是按“柱/锥”配合体系设计的.编辑本段密封管螺纹的标记英制密封管螺纹的完整标记由螺纹特征代号、螺纹尺寸代号和旋向代号组成.英制密封圆柱内螺纹的特征代号为：RP；英制密封圆锥内螺纹的特征代号为：RC；英制密封圆锥外螺纹的特征代号为：R1（与英制密封圆柱内螺纹配合使用）；R2（与英制密封圆锥内螺纹配合使用）；左旋螺纹的旋向代号为LH；右旋螺纹的旋向代号省略不标.对密封管螺纹，利用RP/R1，RC/R2分别表示“柱/锥” 和“锥/锥”螺纹副.2、非密封管螺纹英制非密封管的基本尺寸及其极限偏差标记:英制非密封管螺纹的完整标记由螺纹特征代号，螺纹尺寸代号，中径公差等级代号和旋向代号组成.英制非密封圆柱螺纹的特征代号为：G对英制非密封圆柱内螺纹，其中径公差等级代号省略不标；而英制非密封圆柱外螺纹的中径公尺等级代号分别为A和B.左旋螺纹的旋向代号为LH；右旋螺纹的旋向代号省略不标.当表示英制非密封管螺纹的螺纹副时，仅标注外螺纹的标记代号.示例：尺寸代号为2的右旋，非密封圆柱内螺纹：G2尺寸代号为3的A级，右旋，非密封圆柱外螺纹：G3A尺寸代号为4的B级，左旋，非密封圆柱外螺纹：G4 B-LH尺寸代号为2的右旋，非密封圆柱内螺纹与A级圆柱外螺纹组成的螺纹副：G2A加工内孔螺纹的是管螺纹丝锥加工外螺纹的有板牙。
(完整word版)螺纹基本尺寸对照表
11.156
11.328
11。608
11。875
12。017
12.7
9/16″×18UNF
14.252
14.031
13.335
13。221
12。573
12。751
13。081
13.371
13.52
14.288
3/4″×16UNF
19。012
18.773
17.981
17.854
17。12
17.323
15.11
15.875
1—1/16″×14UN
26。947
26.683
25.743
25.608
24。74
24.968
25.375
25。783
25.961
26。987
其它美制螺纹
9/16″×16UN
14.252
14。013
13.221
13。101
12。36
12。573
12。929
13。256
13。411
螺纹代号
外螺纹
内螺纹
公差等级
公差等级
2A
2B
大径
中径
小径
小径
中径
大径
最大
最小
最大
最小
最小
最大
最小
最大
JIC螺纹
7/16″×20UNF
11。079
10.874
10.254
10。147
9.568
9.728
10。033
10。287
10。424
11.113
1/2″×20UNF
12。667
12。461
公制,英制,美制螺纹尺寸对照表
螺纹简介：1.1螺纹的起源一般认为，阿基米德（公元前287-212年）是首先将螺纹用于工业目的，即将低处的水移到高处的一种工具。
1659年法国人贝兹逊发明螺纹切割机；其后，经过英国的威阿特、亨利•莫斯列，到其子弟约瑟夫•惠氏于1841年才统一原本混乱的螺纹，促进螺纹制品的全球普及；因此，惠氏螺纹也随英国工业的发达而广泛传播世界。
美制螺纹依据塞勒氏螺纹（Seller's thread）而问世于1924年；二次世界大战中，美国、英国、加拿大三国协定发展成统一制螺纹Unified thread。
随着国际交流的频繁，1947年成立的ISO国际标准化组织（International standard organization)成为推动国际标准化的重要力量。
1.2螺纹概述按用途分类，可分为紧固螺纹、密封螺纹、传动螺纹、管螺纹、专用螺纹。
1.3螺纹的分类A、公制螺纹表示螺纹的记号为M,公称直径d或D与螺距P是以mm毫米来标识，螺纹牙尖角为60度。
这是我国GB标准所规定使用的螺纹，也是常见到的。
B、英美制统一螺纹表示螺纹的记号为U,公称直径d或D为英寸，螺距是以每英寸（25.4mm）的牙树来标识，螺纹牙尖角为60度。
这是通俗成为美制规格的螺纹。
C、惠氏螺纹表示螺纹的记号为W，螺纹直径为英寸，螺距以每英寸（25.4mm）的牙树来标识，螺纹牙尖角为55度。
这是英国采用的标准，牙尖角有点特殊的螺纹。
D、管用螺纹主要指英国BSP螺纹系统，用在管接头，分为推拔螺纹（记号为PT）和平和螺纹（记号为PS），牙尖角为55度，螺距以每英寸（25.4mm）的牙树来标识；公称方法依据所配的钢管的公称方法（英寸），因此，实际的螺纹外径与公称直径不同。
E、自行车用螺纹表示螺纹的记号为BC,螺纹的牙尖角为60度，一般用的公称直径为英寸，轮辐用的公称直径为mm，螺距是以每25.4mm的牙树来标识。
F、缝纫机用螺纹表示螺纹的记号为SM，为缝纫机专用螺纹，牙尖角为60度，公称直径为英寸，螺距是以每25.4mm的牙树来标识。
公制、英制、美制各类螺纹标准
公制标准牙公制幼牙尺寸牙距(MM)底孔直径(MM)尺寸牙距(MM)底孔直径(MM)尺寸牙距(MM)底孔直径(MM)M10.250.7(0.75) M1.10.250.8(0.85) M1.20.250.9(0.95) M1.40.3 1.1M1.60.35 1.2(1.25) M1.80.35 1.4(1.45) M20.4 1.6M2.20.45 1.7(1.75) M2.50.45 2.0(2.05) M30.5 2.5M3.50.6 2.9M40.7 3.3M4.50.75 3.7M50.8 4.2M615M716M8 1.25 6.8M9 1.257.8M10 1.58.5M11 1.59.5M12 1.7510.2M14212M16214M18 2.515.5M20 2.517.5M22 2.519.5M24321M27324M30 3.526.5M33 3.529.5M36432M39435M42 4.537.5M45 4.540.5M48543M52547M56 5.550.5M2.50.35 2.1(2.15)M30.35 2.6(2.65)M3.50.35 3.1(3.15)M40.5 3.5M4.50.54M50.5 4.5M5.50.55M60.75 5.2M70.75 6.2M80.757.217M90.758.218M100.759.2191.258.8M110.7510.2110M121111.2510.81.510.5M141131.2512.81.512.5M151141.513.5M161151.514.5M171161.515.5M181171.516.5216M201191.518.5218M22121M241231.522.5222124M25 1.523.5223126M27 1.525.5225127M28 1.526.5226129M301.528.5228327M321.530.52301.531.5M33231330M35 1.533.51.534.5M36234333M38 1.536.5M391.537.5237336M401.538.5238337M421.540.52403394381.543.51/1660 1.153/3248 1.81/840 2.65/3232 3.13/1624 3.67/3224 4.41/420 5.19/3220 5.81.520.5220M45243342441尺寸英制标准牙BSW英制幼牙BSF美制标准牙UNC美制幼牙UNF美制幼牙UNEF英制喉牙G,BSP英制锥喉牙Rc,BSPT美制喉牙NPS美制锥喉牙NPT 英制(tach)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)牙距(per inch)底孔直径(MM)5/1618 6.53/8167.97/16149.31/21210.59/1612121113.511/1611153/410 6.513/1610187/8919.25920.751"8221.1/8724.751.1/4727.751.3/8630.51.1/2633.51.5/8535.51.3/45391.7/8 4.541.55/82" 4.544.52.1/44502.1/2456.52.3/43.5623" 3.568.532428 4.726 5.426 6.222 6.8208.3189.81611.21612.714141415.7512171218.511201121.751023926929832835837.5740743746.5652658.5664.5569.7520 5.118 6.6168149.41310.81212.21113.51016.5919.5822.25725728630.75634539.54.5454.551.5457.25463.547028 5.524 6.9248.5209.92011.51812.91814.51617.51420.41223.251226.51229.51232.75123632 5.5327.1328.62810.12811.724132414.752017.52019.252020.752022.252023.751826.751830183318362416.25288.8288.6278.51911.81911.518111915.2519151814.514191418.5141814211424.5142414231428.251130.751130.2511.5291818141411.511.51518.52430278.91135.51139.5113911.53811.53911421145114511.54411.5451149.611571156.511.55611.5571163.31179.111511172.81171.48678681185.5883884美制小牙孔标准牙(NC)美制小牙孔幼牙(NC)牙距(per inch)编号底孔直径(MM)底孔深度(MM)螺纹深度(MM)牙距(per inch)编号底孔直径(MM)底孔深度(MM)螺纹深度(MM)64#1-64 1.5(1.55)5456#2-56 1.8(1.85)6448#3-48 2.17540 2.3(2.35)8640#5-40 2.6(2.65)9632#6-32 2.8(2.85)10732#8-32 3.511824#10-24 3.9131024#12-24 4.51511#4-4080#0-80 1.2(1.25)4372#1-72 1.5(1.55)5464#2-64 1.96456 2.1(2.15)7548#4-48 2.48644#5-44 2.79640#6-40 2.9(2.95)10736#8-36 3.511832#10-32 4.11310#3-5628#12-28 4.71511制订:审核:日期:公制,英制,美制螺纹标准。
螺纹基本尺寸对照表
螺纹代号
基面上的直径
螺纹长度
大径
中径
小径
有效长度
管端至基面长
Z1/8″×27
10.272
9.519
8.766
7
4.572
Z1/4″×18
13.572
12.443
11.314
9.5
5.080
Z3/8″×18
17.055
15.926
14.797
10.5
6.096
18.019
18.184
19.05
7/8″×14UNF
22.184
21.923
21.006
20.869
20.025
20.269
20.676
21.046
21.224
22.225
1-1/16″×12UN
26.944
26.655
25.57
25.425
24.425
24.689
25.146
25.613
25.801
内螺纹
公差等级
公差等级
2A
2B
大径
中径
小径
小径
中径
大径
最大
最小
最大
最小
最小
最大
最小
最大
JIC螺纹
7/16″×20UNF
11.079
10.874
10.254
10.147
9.568
9.728
10.033
10.287
10.424
11.113
1/2″×20UNF
12.667
12.461
11.841
英制美制及公制螺纹基本尺寸及公差
英制美制及公制螺纹基本尺寸及公差英制、美制及公制螺纹基本尺寸及公差一、英制圆柱管螺纹BSP BSPP P的基本尺寸及公差（牙形角55o）螺纹代号基本直径内螺纹外螺纹大径中径小径中径公差小径公差A级B级中径公差大径公差中径公差大径公差G1/8″×28 9.728 9.147 8.566 +0.170 +0.282-0.107-0.214-0.214-0.214G1/4″×19 13.157 12.301 11.445 +0.125 +0.445 -0.125 -0.250 -0.250 0-0.250G3/8″×19 16.662 15.806 14.950 +0.125+0.445-0.125-0.250-0.250-0.250G1/2″×14 20.955 19.793 18.631 +0.142+0.541-0.142-0.284-0.284-0.284G5/8″×14 22.911 21.749 20.587 +0.142+0.541-0.284-0.284-0.284G3/4″×14 26.441 25.279 24.117 +0.142 +0.541-0.142-0.284-0.284-0.284G1″×11 33.249 31.770 30.291 +0.180+0.640-0.180-0.360-0.360-0.360G1.1/4″×11 41.910 40.431 38.952 +0.180 +0.640-0.180-0.360-0.360-0.360G1.1/2″×11 47.803 46.324 44.854 +0.180 +0.640-0.180-0.360-0.360-0.360G2″×11 59.614 58.135 56.656 +0.180+0.640-0.360-0.360-0.360G2.1/2”X11 75.184 73.705 72.226 +0.217+0.640-0.217-0.434-0.434-0.434G3”X11 87.884 86.405 84.926 +0.217+0.640-0.217-0.434-0.434-0.434G3.1/2”X11 100.330 98.851 97.372 +0.217+0.640-0.217-0.434-0.434-0.434二、英制圆锥管螺纹（BSPTBSPTBSPT）的基本尺寸及公差（牙形角55o）螺纹代号基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向位移偏差（±mm）大径中径小径基本最大最小基本最大最小R1/8″×28 9.728 9.147 8.566 4.0 4.9 3.1 6.5 7.4 5.6 1.1R1/4″×19 13.157 12.301 11.445 6.0 7.3 4.7 9.7 11.0 8.4 1.7 R3/8″×19 16.662 15.806 14.950 6.4 7.7 5.1 10.1 11.4 8.8 1.7 R1/2″×14 20.955 19.793 18.631 8.2 10.0 6.4 13.2 15.0 11.4 2.3 R3/4″×14 26.441 25.279 24.117 9.5 11.3 7.7 14.5 16.3 12.7 2.3 R1″×11 33.249 31.770 30.291 10.4 12.7 8.1 16.8 19.1 14.5 2.9 R1.1/4″×11 41.910 40.431 38.952 12.7 15.0 10.4 19.1 21.4 16.8 2.9 R1.1/2″×11 47.803 46.324 44.845 12.7 15.0 10.4 19.1 21.4 16.8 2.9 R2″×11 59.614 58.135 56.656 15.9 18.2 13.6 23.4 25.7 21.1 2.9 R2.1/2”X11 75.184 73.705 72.226 17.5 21.0 14.0 26.7 30.2 23.2 3.5 R3”X11 87.884 86.405 84.926 20.6 24.1 17.1 29.8 33.3 26.3 3.5 R3.1/2”X11 100.330 98.851 97.372 22.2 25.7 18.7 31.4 34.927.9 3.5三、美制管螺纹（UN(F)UN(F)UN(F)）基本尺寸及公差（牙形角60o）螺纹代号外螺纹内螺纹公差等级公差等级2A 2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC螺纹7/16″×20UNF 11.079 10.874 10.254 10.147 9.568 9.72810.033 10.287 10.424 11.113 1/2″×20UNF 12.667 12.461 11.84111.732 11.156 11.328 11.608 11.875 12.017 12.7 9/16″×18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.288 3/4″×16UNF 19.012 18.773 17.981 17.854 17.12 17.323 17.678 18.019 18.184 19.05 7/8″×14UNF 22.184 21.923 21.006 20.869 20.025 20.269 20.676 21.046 21.224 22.225 1-1/16″×12UN 26.944 26.655 25.57 25.425 24.425 24.689 25.146 25.613 25.801 26.988 1-5/16″×12UN 33.294 33.005 31.92 31.77330.775 31.039 31.496 31.963 32.154 33.338 1-5/8″×12UN 41.229 40.94 39.885 39.705 38.71 38.989 39.446 39.901 40.094 41.275 1-7/8″×12UN 47.579 47.29 46.205 46.053 45.06 45.339 45.796 46.251 46.449 47.625 2-1/2″×12UN 63.452 63.162 62.078 61.92 60.932 61.214 61.671 62.126 62.332 63.5ORFS螺纹9/16″×18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.288 11/16″×16UN 17.427 17.188 16.396 16.274 15.535 15.748 16.104 16.431 16.589 17.463 13/16″×16UN 20.599 20.361 19.568 19.444 18.707 18.923 19.279 19.606 19.766 20.638 1″×14UNF 25.357 25.095 24.178 24.036 23.195 23.444 23.825 24.221 24.407 25.4 1-3/16″×12UN 30.119 29.83 28.745 28.598 27.6 27.864 28.321 28.788 28.979 30.163 1-7/16″×12UN 36.467 36.177 35.093 34.943 33.947 34.214 34.671 35.138 35.331 36.513 1-11/16″×12UN 42.817 42.527 41.443 41.29 40.297 40.564 41.021 41.488 41.686 42.863 2″×12UN 50.754 50.465 49.38 49.225 48.235 48.514 48.971 49.426 49.627 50.8SAE螺纹5/8″×18UNF 15.839 15.618 14.923 14.803 14.161 14.351 14.681 14.958 15.11 15.875 1-1/16″×14UN 26.947 26.683 25.743 25.608 24.74 24.968 25.375 25.783 25.961 26.987其它美制螺纹9/16″×16UN 14.252 14.013 13.221 13.101 12.36 12.573 12.929 13.256 13.411 14.288 7/8″×12UN 22.182 21.892 20.808 20.668 19.662 19.939 20.396 20.851 21.034 22.225 2-1/4″×12UN 57.104 56.815 55.73 55.575 54.585 54.864 55.321 55.776 55.976 57.15 注：UNC粗牙螺纹系列，UNF细牙螺纹系列，UNEF超细牙螺纹系列，UN不变螺距系列四、布锥管螺纹（NPTNPTNPT）基本尺寸及公差(牙形角60o)螺纹代号基面上的直径螺纹长度大径中径小径有效长度管端至基面长Z1/8″×27 10.272 9.519 8.766 7 4.572 Z1/4″×18 13.572 12.443 11.314 9.5 5.080 Z3/8″×18 17.055 15.926 14.797 10.5 6.096 Z1/2″×14 21.223 19.772 18.321 13.5 8.028 Z3/4″×14 26.568 25.117 23.666 14 8.611 Z1″×11.5 33.228 31.461 29.694 17.5 10.160 Z1.1/4″×11.5 41.985 40.218 38.451 18 10.688 Z1.1/2″×11.5 48.054 46.287 44.520 18.5 10.688 Z2″×11.5 60.09258.325 56.558 19 11.074五、公制螺纹基本尺寸及公差(牙形角60o)螺纹代号基本直径内螺纹外螺纹大径中径小径公差等级公差等级6H 7H 6g中径公差小径公差中径公差小径公差中径公差大径公差M10X1 10 9.350 8.917 +0.150+0.236+0.190+0.300-0.026-0.138-0.026-0.206M12X1 12 11.350 10.917 +0.160+0.236+0.200+0.300-0.144-0.026-0.206M14X1 14 13.350 12.917 +0.160 +0.236+0.200+0.300-0.026-0.144-0.026-0.206M12X1.25 12 11.188 10.647 +0.180 +0.265+0.224+0.335-0.028-0.160-0.028-0.240M14X1.25 14 13.188 12.647 +0.180 +0.265+0.224+0.335-0.028-0.160-0.028-0.240M12X1.5 12 11.026 10.376 +0.190 +0.300+0.375-0.032-0.172-0.032-0.268M14X1.5 14 13.026 12.376 +0.190 +0.300+0.236+0.375-0.032-0.172-0.032-0.268M16X1.5 16 15.026 14.376 +0.190 +0.300+0.236+0.375-0.032-0.172-0.032-0.268M18X1.5 18 17.026 16.373 +0.190 +0.300+0.236+0.375-0.032-0.172-0.032-0.268M20X1.5 20 19.026 18.376 +0.190 +0.300+0.236+0.375-0.032-0.172-0.032-0.268M22X1.5 22 21.026 20.376 +0.190 +0.300+0.236+0.375-0.032-0.172-0.032-0.268M24X1.5 24 23.026 22.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M26X1.5 26 25.026 24.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M27X1.5 27 26.026 25.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M30X1.5 30 29.026 28.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M33X1.5 33 32.026 31.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M36X1.5 36 35.026 34.376 +0.200 +0.300+0.250+0.375-0.182-0.032-0.268M39X1.5 39 38.026 37.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M42X1.5 42 41.026 40.376 +0.200 +0.300+0.250+0.375-0.032-0.182-0.032-0.268M27X2 27 25.701 24.835 +0.224 +0.375+0.280+0.475-0.038-0.208-0.038-0.318M30X2 30 28.701 27.835 +0.224 +0.375+0.475-0.038-0.208-0.038-0.318M33X2 33 31.701 30.835 +0.224 +0.375+0.280+0.475-0.038-0.208-0.038-0.318M36X2 36 34.701 33.835 +0.224 +0.375+0.280+0.475-0.038-0.208-0.038-0.318M39X2 39 37.701 36.835 +0.224 +0.375+0.280+0.475-0.038-0.208-0.038-0.318M42X2 42 40.701 39.835 +0.224 +0.375+0.280+0.475-0.038-0.208-0.038-0.318M45X2 45 43.701 42.835 +0.224 +0.375+0.280+0.475-0.038-0.208-0.038-0.318M52X2 52 50.701 49.835 +0.236 +0.375+0.300+0.475-0.038-0.218-0.038-0.318M60X2 60 58.701 57.835 +0.236 +0.375+0.300+0.475-0.038-0.218-0.038-0.318M64X2 64 62.701 61.835 +0.236 +0.375+0.300+0.475-0.038-0.218-0.038-0.318M72X2 72 70.701 69.835 +0.236 +0.375+0.300+0.475-0.038-0.218-0.038-0.318。
美制英制公制螺纹孔尺寸表
螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.3052 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.2793 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.3304 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.3565 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406-12 26.944 26.655 0.290 24.689 25.146 0.457 6 11/16-12 33.294 33.005 0.290 31.039 31.496 0.457 7 15/168 15/-12 41.229 40.940 0.290 38.989 39.446 0.4578-12 47.579 47.290 0.290 45.339 45.796 0.457 9 17/8-12 63.452 63.162 0.290 61.214 61.671 0.457 10 21/2公制细牙6g外螺纹大径6H内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.2402 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.3003 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.3004 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.3005 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.3006 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.3007 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.3008 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.3009 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.30010 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.30011 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.3000.375 12 M27*2 26.962 26.682 0.280 24.83525.21013 M30*2 29.962 29.682 0.280 27.835 28.210 0.37514 M33*2 32.962 32.682 0.280 30.835 31.210 0.37515 M36*2 35.962 35.682 0.280 33.835 34.210 0.37516 M42*2 41.962 41.682 0.280 39.835 40.210 0.375英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.2822 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.4453 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.4454 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.5415 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.5416 G1-11 33.249 32.889 0.360 30.291 30.931 0.640-11 41.910 41.550 0.360 38.952 39.592 0.6407 G11/4-11 47.803 47.443 0.360 44.845 45.485 0.6408 G11/2公制/美制/英制螺纹对照表给大家分享一下 A型美制螺纹（UNF）常用规格牙型角60外螺纹内螺纹 -4 9/16"-19牙 14.28 13.08 -6 11/16''-16 17.46 16.1 -8 13/16''-16 20.64 19.28 -10 1''-14 2 5.40 23.57 -12 1(3/16)''-12 30.00 28.32 -16 1(7/16)''-12 36.51 34.67 -20 1(11/16)' '-12 42.86 41.02 C型JIC37度美制UNF螺纹常用规格牙型角60-4 7/16”-20 11.11 10.03 -5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 -83/4”-16 19.00 17.68 -10 7/8”-14 22.22 20.68 -12 1(1/16)"-12 26.98 25.15 -16 1 (5/16)"-12 33.33 31.5 -20 1(5/8)"-12 41.28 39.44 -24 1(7/8)"-12 47.62 45.8 -32 2(1/2)"-12 63.5 61.67 英制圆柱管螺纹（BSPP）常用规格牙型角55-4 1/4”-19 13.157 11.55 -6 3/8”-19 16.662 14.95 -8 1/2”-14 20.955 18.63 -12 3/4”-14 26.441 24.11 -16 1”-11 33.249 30.29 -20 1(1/4)''-11 41.91 38.95 英制圆锥管螺纹（BSPT）常用规格牙型角55基面大径基准距离1/4”-19 13.157 6 3/8”-19 16.662 6.4 1/2”-14 20.955 8.2 3/4”-14 26.441 9.5 1”-11 33.249 10.4 1(1/4)''-11 41.91 12.7 美制圆锥管螺纹（NPT）牙型角601/8”-27 10.24 4 1/4”-18 13.60 4 3/8”-18 17.04 4.32 1/2”-14 21.22 4.48 3/4”-14 26.57 4.75 1”-11(1/2)” 33.22 4.6 1(1/4)”-11.5 41.96 4.83螺纹的一般知识第一章国标螺纹的一般知识一. 螺纹的分类1. 螺纹分内螺纹和外螺纹两种；2. 按牙形分可分为：1）三角形螺纹2）梯形螺纹3）矩形螺纹4）锯齿形螺纹；3. 按线数分单头螺纹和多头螺纹；4. 按旋入方向分左旋螺纹和右旋螺纹两种, 右旋不标注，左旋加LH，如M24×1.5LH；5. 按用途不同分有：米制普通螺纹、用螺纹密封的管螺纹、非螺纹密封的管螺纹、60°圆锥管螺纹、米制锥螺纹等二. 米制普通螺纹1. 米制普通螺纹用大写M表示，牙型角2α=60°（α表示牙型半角）；2. 米制普通螺纹按螺距分粗牙普通螺纹和细牙普通螺纹两种；2.1. 粗牙普通螺纹标记一般不标明螺距，如M20表示粗牙螺纹；细牙螺纹标记必须标明螺距，如M30×1.5表示细牙螺纹、其中螺距为1.5。
螺纹基本尺寸对照表
|英制管螺纹基本尺寸及公差（牙形角55º）BSPP英制锥管螺纹基本尺寸及公差（牙形角55º）BSPT美制管螺纹基本尺寸及公差（牙形角60º）UN(F)公制螺纹基本尺寸及公差(牙形角60º) M|55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)4 R55"11'R66"{11聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm 的大口径厚壁卷管，可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
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螺纹基本尺寸对照表.
英制管螺纹基本尺寸及公差（牙形角 55o） BSPP英制锥管螺纹基本尺寸及公差（牙形角 55o） BSPT美制管螺纹基本尺寸及公差（牙形角 60o） UN（F）布锥管螺纹基本尺寸及公差（牙形角60o） NPT公制螺纹基本尺寸及公差（牙形角 60o） M55 °圆锥管螺纹基本尺寸对照表最新下载-汇兴达55 °圆锥管螺纹基本尺寸对照表最新下载-汇兴达55 °圆锥管螺纹(BSPT)R1 /2 1/220.9551.8141419.79318.6311.1622R4.3 3/4 26. 1.8 14 25. 1 1.162/ 441 14 27914730.R1" 33. 2.31131.2 1.4791 249 09 7791R 31 141. 2.3 40.8.1 1/4 910 09 11 431 9 1.479 / 54 2R 41 147. 2.3 46.4.1 1/2 803 09 11 324 8 1.479 / 42 556.R2" 59. 2.31158.6 1.4792 614 09 13556R 2 2 75. 2.3 11 73.72.1.479 1/2184 09 7051 2/ 22 684.R 87. 2.3 86.3" 11 9 1.4793 884 09 4052611113 111R 2.3 0.4" .03 11 .55 1.4794 09 00 17213138 136R 2.3 5.5" .43 11 .95 1.4795 09 40 17216163 162R 2.3 0.6" .83 11 .35 1.4796 09 80 172聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm —1020mm*200mm 合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm ，壁厚16mm-100mm ，外径精度±0.5%, 壁厚精度±5% 热轧中厚壁无缝钢管、16Mn 外径400 —1600mm 、壁厚20 —60mm 的大口径厚壁卷管，可定尺到16 米及各种规格的无缝方管、异型无缝钢管等. 常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
螺纹标记(公制、美制和英制)
螺纹标记（公制、美制和英制）1，公制螺纹标记：.11标记方法完整的螺纹标记由螺纹特征代号、尺寸代号、公差代号及其他代号组成。
螺纹特征代号用“M”表示。
单线螺纹的尺寸代号为“公称直径╳螺距”，公称直径和螺距数值的单位为毫米。
对粗牙螺纹，可以省略标注其螺距项。
多线螺纹的尺寸代号为“公称直径╳Ph导程、P螺距“、公称直径、导程.和螺距数值的单位为毫米.可以在后面增加括号说明线数(英文).公差带代号包含中径和顶径公差带代号, 中径公差带代号在前, 顶径公差带代号在后.内螺纹用大写字母,外螺纹用小写字母，.如果中径公差带代号和顶径公差带代号相同,则只标注一个公差带代号，.螺纹尺寸代号与公差带间用”━”号分开.大批生产的紧固件螺纹(中等公差精度和中等旋合长度,6H/6g)不标注其公差带代号。
表示螺纹配合时, 内螺纹公差带代号在前, 外螺纹公差带代号在后,中间用斜线分开.对旋合长度为短组和长组的螺纹,在公差带代号后应分别标注”S”和:”L”代号.旋合长度代号和公差带间用”━”号分开。
中等旋合长度组不标注.旋合长度代号（N）。
左旋螺纹应在旋合长度代号之后标注“LH”代号。
旋合长度代号与旋向代号间用”━”号分开。
右旋螺纹不标注旋向代号。
1.2 标记示例1.2.1普通螺纹特征代号和尺寸代号部分的标注公称直径为8mm、螺距为1mm的单线细牙螺纹：M8×1公称直径为8mm、螺距为1.25mm的单线粗牙螺纹：M8公称直径为16mm、螺距为1.5mm、导程为3mm的双线螺纹：M16×Ph3P1.5或M16×Ph3P1.5（two starts）1.2.2 增加公差带代号后的标注中径公差带为5g、顶径公差带为6g的外螺纹：M10×1-5g6g中径公差带和顶径公差带为6g的粗牙外螺纹：M10-6g中径公差带为5H、顶径公差带为6H的内螺纹：M10×10-5H6H中径公差带和顶径公差带为6H的粗牙内螺纹：M10-6H中径公差带和顶径公差带均为6g、中等公差径精度的粗牙外螺纹：M10中径公差带和顶径公差带均为6g、中等公差径精度的粗牙内螺纹：M10公差带为6H的内螺纹与公差带为5g6g外螺纹组成配合：M20×2-6H/5g6g公差带为6H的内螺纹与公差带为6g的外螺纹组成配合（中等精度、粗牙）：M201.2.3增加旋合长度代号后的标注短旋合长度的内螺纹：M20×2-5H-S长旋合长度的内、外螺纹：M6-7H/7g6g-L中等旋合长度的外螺纹（粗牙、中等精度的6g公差带）：M61.2.4 增加旋向代号后的标注（完整标注）左旋螺纹：M8×1-LH（公差带代号和旋合长度代号被省略）M6×0.75-5h6h-S-LHM14×Ph6P2-L-LH 或M14×Ph6P2（three starts）-L-LH右旋螺纹：M6（螺距、公差带代号和旋向代号被省略）2美制统一螺纹标注2.1美制统一螺纹的基本标记对标准系列、标准旋合长度和标准公差的统一螺纹，其标记包含五项基本内容。
公制美制英制螺纹对照表
公制/美制/英制螺纹对照表A型美制螺纹（UNF）常用规格外螺纹螺纹-4 9/16"-19牙 14.28 13.08 -6 11/16''-16 17.46 16.1-8 13/16''-16 20.64 19.28-10 1''-14 25.40 23.57-12 1(3/16)''-12 30.00 28.32 -16 1(7/16)''-12 36.51 34.67 -20 1(11/16)''-12 42.86 41.02C型JIC37度美制UNF螺纹常用规格-4 7/16”-20 11.11 10.03-5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08-8 3/4”-16 19.00 17.68-10 7/8”-14 22.22 20.68-12 1(1/16)"-12 26.98 25.15 -16 1(5/16)"-12 33.33 31.5 -20 1(5/8)"-12 41.28 39.44 -24 1(7/8)"-12 47.62 45.8-32 2(1/2)"-12 63.5 61.67英制圆柱管螺纹（BSPP）常用规格-4 1/4”-19 13.157 11.55-6 3/8”-19 16.662 14.95-8 1/2”-14 20.955 18.63-12 3/4”-14 26.441 24.11-16 1”-11 33.249 30.29-20 1(1/4)''-11 41.91 38.95英制圆锥管螺纹（BSPT）常用规格基面大径基准距离1/4”-19 13.157 63/8”-19 16.662 6.41/2”-14 20.955 8.23/4”-14 26.441 9.51”-11 33.249 10.41(1/4)''-11 41.91 12.7美制圆锥管螺纹（NPT）1/8”-27 10.24 41/4”-18 13.60 43/8”-18 17.04 4.321/2”-14 21.22 4.483/4”-14 26.57 4.751”-11(1/2)” 33.22 4.61(1/4)”-11.5 41.96 4.832007-4-20 16:33评论(7)3/8-16 0.3643 0.3737 0.3287 0.3331 0.2970 8.40 8.44(0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.3485 9.83 9.87(0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.4041 11.34 11.38(0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.4587 12.80 12.84(0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.5119 14.27 14.32 (0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.6255 17.28 17.33 (0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.7368 20.27 20.32(0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.8446 23.22 23.27(1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
螺纹规格-美制、英制、公制对照表
螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.3052 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.2793 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.3304 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.3565 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.4066 11/16-12 26.944 26.655 0.290 24.689 25.146 0.4577 15/16-12 33.294 33.005 0.290 31.039 31.496 0.4578 15/8-12 41.229 40.940 0.290 38.989 39.446 0.4579 17/8-12 47.579 47.290 0.290 45.339 45.796 0.45710 21/2-12 63.452 63.162 0.290 61.214 61.671 0.457公制细牙6g外螺纹大径6H内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.2402 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.3003 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.3004 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.3005 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.3006 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.3007 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.3008 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.3009 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.30010 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.30011 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.30012 M27*2 26.962 26.682 0.280 24.835 25.210 0.37513 M30*2 29.962 29.682 0.280 27.835 28.210 0.37514 M33*2 32.962 32.682 0.280 30.835 31.210 0.37515 M36*2 35.962 35.682 0.280 33.835 34.210 0.37516 M42*2 41.962 41.682 0.280 39.835 40.210 0.375英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.2822 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.4453 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.4454 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.5415 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.5416 G1-11 33.249 32.889 0.360 30.291 30.931 0.6407 G11/4-11 41.910 41.550 0.360 38.952 39.592 0.6408 G11/2-11 47.803 47.443 0.360 44.845 45.485 0.640 公制/美制/英制螺纹对照表给大家分享一下f a NpX?,A型美制螺纹（UNF）常用规格-,!3 ,oiq外螺纹内螺纹 UX x^Y2-4 9/16"-19牙 14.28 13.08 8-j,M4D*&-6 11/16''-16 17.46 16.1 {lh szc-8 13/16''-16 20.64 19.28 cM iO|N@1-10 1''-14 25.40 23.57 h |t B-12 1(3/16)''-12 30.00 28.32 )Al{84<(}-16 1(7/16)''-12 36.51 34.67 Ys$3}LA{-20 1(11/16)''-12 42.86 41.02 SW 7V7 S*Qz{A h02V@C型JIC37度美制UNF螺纹常用规格(" G'W CLz-4 7/16”-20 11.11 10.03 -e~ xb Qr-5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 NH'YgL6*-8 3/4”-16 19.00 17.68 lxv;6S!J-10 7/8”-14 22.22 20.68 P |J &?KbC-12 1(1/16)"-12 26.98 25.15 Ki; ++-16 1(5/16)"-12 33.33 31.5 ZF !Bk Z U o-20 1(5/8)"-12 41.28 39.44 LX+c Z-24 1(7/8)"-12 47.62 45.8 iDP @c g-32 2(1/2)"-12 63.5 61.67j/5 1 j@^L\e w;h4 y英制圆柱管螺纹（BSPP）常用规格dApg z U@ ;-4 1/4”-19 13.157 11.55 |,hu r8BE\-6 3/8”-19 16.662 14.95 @"%@;>W<t-8 1/2”-14 20.955 18.63 F )$7 ?')p-12 3/4”-14 26.441 24.11 Q} &f3?-16 1”-11 33.249 30.29 YZ @pwhZ<-20 1(1/4)''-11 41.91 38.95 SmU'a o.\<v{UpdB" ]5英制圆锥管螺纹（BSPT）常用规格b sDc <lI基面大径基准距离A4<q_07#1/4”-19 13.157 6 }@E K'k3/8”-19 16.662 6.4 .gy5/-.SZ1/2”-14 20.955 8.2 R0?/' gt3/4”-14 26.441 9.5 aF4L{ 'qK1”-11 33.249 10.4 Q,Y do1(1/4)''-11 41.91 12.7 i '9m o0bmO@;ir e_^C X "TaT"(1 G # 美制圆锥管螺纹（NPT） 9 mJ f1/8”-27 10.24 4 3 x VYo $g 1/4”-18 13.60 4 L8 |v?J 3/8”-18 17.04 4.32D[-ijs3/4”-14 26.57 4.75 GIry1(1/4)”-11.5 41.96 4.83。
螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55º） BSPP螺纹代号基本直径内螺纹外螺纹大径中径小径中径公差小径公差A级B级中径公差大径公差中径公差大径公差G1/8″×289.7289.1478.566+0.170+0.282-0.107-0.214-0.214-0.214G1/4″×1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8″×1916.66215.80614.950+0.125+0.445-0.125-0.250-0.250-0.250G1/2″×1420.95519.79318.631+0.142+0.541-0.142-0.284-0.284-0.284G5/8″×1422.91121.74920.587+0.142+0.541-0.142-0.284-0.284-0.284G3/4″×1426.44125.27924.117+0.142+0.541-0.142-0.284-0.284-0.284G1″×1133.24931.77030.291+0.180+0.640-0.180-0.360-0.360-0.360G1.1/4″×1141.91040.43138.952+0.180+0.640-0.180-0.360-0.360-0.360G1.1/2″×1147.80346.32444.854+0.180+0.640-0.180-0.360-0.360-0.360G2″×1159.61458.13556.656+0.180+0.640-0.180-0.360-0.360-0.360G2.1/2”X1175.18473.70572.226+0.217+0.640-0.217-0.434-0.434-0.434G3”X1187.88486.40584.926+0.217+0.640-0.217-0.434-0.434-0.434G3.1/2”X11100.33098.85197.372+0.217+0.640-0.217-0.434-0.434-0.434英制锥管螺纹基本尺寸及公差（牙形角55º） BSPT螺纹代号基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向位移偏差（±mm）大径中径小径基本最大最小基本最大最小R1/8″×289.7289.1478.566 4.0 4.9 3.1 6.57.4 5.6 1.1 R1/4″×1913.15712.30111.445 6.07.3 4.79.711.08.4 1.7 R3/8″×1916.66215.80614.950 6.47.7 5.110.111.48.8 1.7 R1/2″×1420.95519.79318.6318.210.0 6.413.215.011.4 2.3 R3/4″×1426.44125.27924.1179.511.37.714.516.312.7 2.3 R1″×1133.24931.77030.29110.412.78.116.819.114.5 2.9 R1.1/4″×1141.91040.43138.95212.715.010.419.121.416.8 2.9 R1.1/2″×1147.80346.32444.84512.715.010.419.121.416.8 2.9 R2″×1159.61458.13556.65615.918.213.623.425.721.1 2.9 R2.1/2”X1175.18473.70572.22617.521.014.026.730.223.2 3.5 R3”X1187.88486.40584.92620.624.117.129.833.326.3 3.5 R3.1/2”X11100.33098.85197.37222.225.718.731.434.927.9 3.5美制管螺纹基本尺寸及公差（牙形角60º） UN(F)螺纹代号外螺纹内螺纹公差等级公差等级2A2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC螺纹7/16″×20UNF11.07910.87410.25410.1479.5689.72810.03310.28710.42411.113 1/2″×20UNF12.66712.46111.84111.73211.15611.32811.60811.87512.01712.7 9/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.288 3/4″×16UNF19.01218.77317.98117.85417.1217.32317.67818.01918.18419.05 7/8″×14UNF22.18421.92321.00620.86920.02520.26920.67621.04621.22422.225 1-1/16″×12UN26.94426.65525.5725.42524.42524.68925.14625.61325.80126.988 1-5/16″×12UN33.29433.00531.9231.77330.77531.03931.49631.96332.15433.338 1-5/8″×12UN41.22940.9439.88539.70538.7138.98939.44639.90140.09441.275 1-7/8″×12UN47.57947.2946.20546.05345.0645.33945.79646.25146.44947.625 2-1/2″×12UN63.45263.16262.07861.9260.93261.21461.67162.12662.33263.5ORFS螺纹9/16″×18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.288 11/16″×16UN17.42717.18816.39616.27415.53515.74816.10416.43116.58917.463 13/16″×16UN20.59920.36119.56819.44418.70718.92319.27919.60619.76620.638 1″×14UNF25.35725.09524.17824.03623.19523.44423.82524.22124.40725.4 1-3/16″×12UN30.11929.8328.74528.59827.627.86428.32128.78828.97930.163 1-7/16″×12UN36.46736.17735.09334.94333.94734.21434.67135.13835.33136.513 1-11/16″×12UN42.81742.52741.44341.2940.29740.56441.02141.48841.68642.863 2″×12UN50.75450.46549.3849.22548.23548.51448.97149.42649.62750.8SAE螺纹5/8″×18UNF15.83915.61814.92314.80314.16114.35114.68114.95815.1115.875 1-1/16″×14UN26.94726.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺纹9/16″×16UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.288 7/8″×12UN22.18221.89220.80820.66819.66219.93920.39620.85121.03422.225 2-1/4″×12UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注：UNC粗牙螺纹系列，UNF细牙螺纹系列， UNEF超细牙螺纹系列， UN不变螺距系列布锥管螺纹基本尺寸及公差(牙形角60º) NPT螺纹代号基面上的直径螺纹长度大径中径小径有效长度管端至基面长Z1/8″×2710.2729.5198.7667 4.572 Z1/4″×1813.57212.44311.3149.5 5.080 Z3/8″×1817.05515.92614.79710.5 6.096 Z1/2″×1421.22319.77218.32113.58.028 Z3/4″×1426.56825.11723.666148.611 Z1″×11.533.22831.46129.69417.510.160 Z1.1/4″×11.541.98540.21838.4511810.688 Z1.1/2″×11.548.05446.28744.52018.510.688 Z2″×11.560.09258.32556.5581911.074公制螺纹基本尺寸及公差(牙形角60º) M螺纹代号基本直径内螺纹外螺纹大径中径小径公差等级公差等级6H7H6g中径公差小径公差中径公差小径公差中径公差大径公差M10X1109.3508.917+0.150+0.236+0.190+0.300-0.026-0.138-0.026-0.206M12X11211.35010.917+0.160+0.236+0.200+0.300-0.026-0.144-0.026-0.206M14X11413.35012.917+0.160+0.236+0.200+0.300-0.026-0.144-0.026-0.206M12X1.251211.18810.647+0.180+0.265+0.224+0.335-0.028-0.160-0.028-0.240M14X1.251413.18812.647+0.180+0.265+0.224+0.335-0.028-0.160-0.028-0.240M12X1.51211.02610.376+0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M14X1.51413.02612.376+0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M16X1.51615.02614.376+0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M18X1.51817.02616.373+0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M20X1.52019.02618.376+0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M22X1.52221.02620.376+0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M24X1.52423.02622.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M26X1.52625.02624.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M27X1.52726.02625.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M30X1.53029.02628.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M33X1.53332.02631.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M36X1.53635.02634.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M39X1.53938.02637.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M42X1.54241.02640.376+0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M27X22725.70124.835+0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M30X23028.70127.835+0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M33X23331.70130.835+0.224+0.375+0.280+0.475-0.038-0.0380000-0.208-0.318M36X23634.70133.835+0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M39X23937.70136.835+0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M42X24240.70139.835+0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M45X24543.70142.835+0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M52X25250.70149.835+0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318M60X26058.70157.835+0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318M64X26462.70161.835+0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318M72X27270.70169.835+0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318。
螺纹基本尺寸对照表
英制管螺纹基本尺寸及公差（牙形角55o）BSPP基本直径内螺纹外螺纹螺纹代号A 级B 级大径中径小径中径公差小径公差中径公差大径公差中径公差大径公差G1/8″× 289.7289.1478.566+0.170+0.2820000 0-0.107-0.214-0.214-0.214G1/4″× 1913.15712.30111.445+0.125+0.445-0.125-0.250-0.2500-0.250G3/8″× 1916.66215.80614.950+0.125+0.4450000 00-0.125-0.250-0.250-0.250G1/2″× 1420.95519.79318.631+0.142+0.5410000 00-0.142-0.284-0.284-0.284G5/8″× 1422.91121.74920.587+0.142+0.5410000 00-0.142-0.284-0.284-0.284G3/4″× 1426.44125.27924.117+0.142+0.5410000 00-0.142-0.284-0.284-0.284G1″× 1133.24931.77030.291+0.180+0.6400000 00-0.180-0.360-0.360-0.360G1.1/4″× 1141.91040.43138.952+0.180+0.6400000 00-0.180-0.360-0.360-0.360G1.1/2″× 1147.80346.32444.854+0.180+0.6400000 00-0.180-0.360-0.360-0.360G2″× 1159.61458.13556.656+0.180+0.6400000 00-0.180-0.360-0.360-0.360G2.1/2 ” X1175.18473.70572.226+0.217+0.640000000-0.217-0.434-0.434-0.434 G3” X1187.88486.40584.926+0.217+0.640000000-0.217-0.434-0.434-0.434G3.1/2 ” X11100.33098.85197.372+0.217+0.6400000 00-0.217-0.434-0.434-0.434英制锥管螺纹基本尺寸及公差（牙形角55o）BSPT基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向螺纹代号大径中径小径基本最大最小基本最大最小位移偏差（± mm）R1/8″× 289.7289.1478.566 4.0 4.9 3.1 6.57.4 5.6 1.1R1/4″× 1913.15712.30111.445 6.07.3 4.79.711.08.4 1.7R3/8″× 1916.66215.80614.950 6.47.7 5.110.111.48.8 1.7R1/2″× 1420.95519.79318.6318.210.0 6.413.215.011.4 2.3R3/4″× 1426.44125.27924.1179.511.37.714.516.312.7 2.3 R1″× 1133.24931.77030.29110.412.78.116.819.114.5 2.9R1.1/4″× 1141.91040.43138.95212.715.010.419.121.416.8 2.9R1.1/2″× 1147.80346.32444.84512.715.010.419.121.416.8 2.9 R2″× 1159.61458.13556.65615.918.213.623.425.721.1 2.9 R2.1/2 ” X1175.18473.70572.22617.521.014.026.730.223.2 3.5 R3” X1187.88486.40584.92620.624.117.129.833.326.3 3.5R3.1/2 ” X11100.33098.85197.37222.225.718.731.434.927.9 3.5美制管螺纹基本尺寸及公差（牙形角60o）UN(F)外螺纹内螺纹公差等级公差等级螺纹代号2A2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC 螺纹7/16″× 20UNF11.07910.87410.25410.1479.5689.72810.03310.28710.42411.1131/2″× 20UNF12.66712.46111.84111.73211.15611.32811.60811.87512.01712.79/16″× 18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.288 3/4″× 16UNF19.01218.77317.98117.85417.1217.32317.67818.01918.18419.05 7/8″× 14UNF22.18421.92321.00620.86920.02520.26920.67621.04621.22422.225 1-1/16″× 12UN26.94426.65525.5725.42524.42524.68925.14625.61325.80126.988 1-5/16″× 12UN33.29433.00531.9231.77330.77531.03931.49631.96332.15433.338 1-5/8″× 12UN41.22940.9439.88539.70538.7138.98939.44639.90140.09441.275 1-7/8″× 12UN47.57947.2946.20546.05345.0645.33945.79646.25146.44947.625 2-1/2″× 12UN63.45263.16262.07861.9260.93261.21461.67162.12662.33263.5ORFS 螺纹9/16″× 18UNF14.25214.03113.33513.22112.57312.75113.08113.37113.5214.288 11/16″× 16UN17.42717.18816.39616.27415.53515.74816.10416.43116.58917.463 13/16″× 16UN20.59920.36119.56819.44418.70718.92319.27919.60619.76620.638 1″× 14UNF25.35725.09524.17824.03623.19523.44423.82524.22124.40725.4 1-3/16″× 12UN30.11929.8328.74528.59827.627.86428.32128.78828.97930.163 1-7/16″× 12UN36.46736.17735.09334.94333.94734.21434.67135.13835.33136.513 1-11/16″× 12UN42.81742.52741.44341.2940.29740.56441.02141.48841.68642.863 2″× 12UN50.75450.46549.3849.22548.23548.51448.97149.42649.62750.8SAE 螺纹5/8″× 18UNF15.83915.61814.92314.80314.16114.35114.68114.95815.1115.8751-1/16″× 14UN26.94726.68325.74325.60824.7424.96825.37525.78325.96126.987其它美制螺纹9/16″× 16UN14.25214.01313.22113.10112.3612.57312.92913.25613.41114.288 7/8″× 12UN22.18221.89220.80820.66819.66219.93920.39620.85121.03422.225 2-1/4″× 12UN57.10456.81555.7355.57554.58554.86455.32155.77655.97657.15注： UNC 粗牙螺纹系列，UNF 细牙螺纹系列，UNEF 超细牙螺纹系列，UN 不变螺距系列布锥管螺纹基本尺寸及公差 (牙形角 60o)NPT基面上的直径螺纹长度螺纹代号大径中径小径有效长度管端至基面长Z1/8 ″× 2710.2729.5198.7667 4.572 Z1/4 ″× 1813.57212.44311.3149.5 5.080 Z3/8 ″× 1817.05515.92614.79710.5 6.096 Z1/2 ″× 1421.22319.77218.32113.58.028 Z3/4 ″× 1426.56825.11723.666148.611 Z1 ″× 11.533.22831.46129.69417.510.160 Z1.1/4″× 11.541.98540.21838.4511810.688Z1.1/2″× 11.548.05446.28744.52018.510.688 Z2 ″× 11.560.09258.32556.5581911.074公制螺纹基本尺寸及公差(牙形角 60o)M基本直径螺纹代号大径中径小径M10X1109.3508.917 M12X11211.35010.917 M14X11413.35012.917 M12X1.251211.18810.647 M14X1.251413.18812.647 M12X1.51211.02610.376 M14X1.51413.02612.376 M16X1.51615.02614.376 M18X1.51817.02616.373 M20X1.52019.02618.376 M22X1.52221.02620.376 M24X1.52423.02622.376 M26X1.52625.02624.376 M27X1.52726.02625.376 M30X1.53029.02628.376 M33X1.53332.02631.376 M36X1.53635.02634.376 M39X1.53938.02637.376 M42X1.54241.02640.376 M27X22725.70124.835 M30X23028.70127.835 M33X23331.70130.835 M36X23634.70133.835 M39X23937.70136.835 M42X24240.70139.835 M45X24543.70142.835 M52X25250.70149.835 M60X26058.70157.835 M64X26462.70161.835 M72X27270.70169.835内螺纹外螺纹公差等级公差等级6H7H6g中径公差小径公差中径公差小径公差中径公差大径公差+0.150+0.236+0.190+0.300-0.026-0.026 0000-0.138-0.206 +0.160+0.236+0.200+0.300-0.026-0.026 0000-0.144-0.206 +0.160+0.236+0.200+0.300-0.026-0.026 0000-0.144-0.206 +0.180+0.265+0.224+0.335-0.028-0.028 0000-0.160-0.240 +0.180+0.265+0.224+0.335-0.028-0.028 0000-0.160-0.240 +0.190+0.300+0.236+0.375-0.032-0.032 0000-0.172-0.268 +0.190+0.300+0.236+0.375-0.032-0.032 0000-0.172-0.268 +0.190+0.300+0.236+0.375-0.032-0.032 0000-0.172-0.268 +0.190+0.300+0.236+0.375-0.032-0.032 0000-0.172-0.268 +0.190+0.300+0.236+0.375-0.032-0.032 0000-0.172-0.268 +0.190+0.300+0.236+0.375-0.032-0.032 0000-0.172-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.200+0.300+0.250+0.375-0.032-0.032 0000-0.182-0.268 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.224+0.375+0.280+0.475-0.038-0.038 0000-0.208-0.318 +0.236+0.375+0.300+0.475-0.038-0.038 0000-0.218-0.318 +0.236+0.375+0.300+0.475-0.038-0.038 0000-0.218-0.318 +0.236+0.375+0.300+0.475-0.038-0.038 0000-0.218-0.318 +0.236+0.375+0.300+0.475-0.038-0.038 0000-0.218-0.31855 °圆锥管螺纹基本尺寸对照表最新下载-汇兴达55 °圆锥管螺纹基本尺寸对照表最新下载-汇兴达55 °圆锥管螺纹 (BSPT)螺纹基本尺寸大径螺距每英寸中小径径外mm牙型高度代号R 1 / 1 6R 1 / 8R 1 / 4R 3 / 8mm英寸d=D1/17.76"231/89.7"281/413."1573/816."662mmp0.9070.9071.3371.337牙数tpi28281919螺d2H1纹=Dd236.7.150.58142618.9.15470.5816611.12.40.8563014514.15.90.8568065R18.11/220. 1.819.1.162146/"95514793321R 24.3 3/4 26. 1.825. / "4411411.1621427941 73 R 33. 2.3 0.31. 1"24911 2 1.4791097791R 3 112.3 8.41.40.11/4091191.479910431/ "5 42R 4 1 14.1 47.2.31146.1.4791/28/ 80309324"4 2556.R59.2.358. 1.4792"11626140913556R 75.2.3 73.2 1171.4792184097051/22.1"2 /2 268R87. 2.34.86.3"884119 1.4793094052611131111R 2.311.550.4".03 1.47940910721 1381363R 2.311.955.5".43 1.479509147211631626R0.2.36".8311.35 1.479 60980172聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm— 1020mm*200mm合金钢管、外径22mm-127mm 冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、 16Mn外径400—1600mm、壁厚20 —60mm的大口径厚壁卷管，可定尺到16 米及各种规格的无缝方管、异型无缝钢管等 . 常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
各国标准螺纹基本尺寸对照表介绍
英制管螺纹基本尺寸及公差（牙形角55o）BSPP英制锥管螺纹基本尺寸及公差（牙形角55o）BSPT美制管螺纹基本尺寸及公差（牙形角60o）UN(F)公制螺纹基本尺寸及公差(牙形角60o) M55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹基本尺寸对照表最新下载-汇兴达55°圆锥管螺纹(BSPT)0 1 872聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm*1mm—1020mm*200mm合金钢管、外径22mm-127mm冷轧无缝钢管、外径127mm-600mm，壁厚16mm-100mm，外径精度±0.5%,壁厚精度±5%热轧中厚壁无缝钢管、16Mn外径400—1600mm、壁厚20—60mm的大口径厚壁卷管，可定尺到16米及各种规格的无缝方管、异型无缝钢管等.常备钢管种类有:构造用无缝钢管、流体用无缝钢管、液压无缝钢管、电力用无缝钢管、石油输送用无缝钢管、化肥设备用无缝钢管、煤矿用无缝钢管、不锈钢无缝钢管、化工用无缝钢管、纺织机械用无缝钢管、汽车；水利用无缝钢管，精密无缝钢管、光亮无缝钢管、军工医疗用无缝钢管、管道用无缝钢管、支柱用无缝钢管、合金无缝管、高压无缝管、大口径直缝焊管等。
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管螺纹的基本尺寸表(2010-10-25 15:57:35)标签：表（1）螺纹基本尺寸G1/2 、ZG1/2 (单位:mm)尺寸代号每25.4mm类的牙数n螺距p 牙型高度h圆弧半径r≈基面上的基本直径基准距离有效螺纹长度大径（基准直径）d=D中径d2=D2小径d1=D11/16 28 0.907 0.581 0.125 7.723 7.142 6.561 4.0 6.5 1/8 28 0.907 0.581 0.125 9.728 9.147 8.566 4.0 6.5 1/4 19 1.337 0.586 0.184 13.157 12.301 11.445 6.0 9.7 3/8 19 1.337 0.586 0.184 16.662 15.806 14.950 6.4 10.1 1/2 14 1.814 1.162 0.249 20.955 19.793 18.631 8.2 13.2锥管螺纹的基本尺寸表（3-28）1/2PT 、1/2NPT 表（2）螺纹基本尺寸 (单位:mm)寸 Ww牙型代号大径 mm d=D螺距 mm p每英寸牙数 tpi中径 mmd2=D2 小径外螺纹 d3牙型高H1底孔直径 mm1/16" BSW 1.587 0.423 60 1.315 1.050 0.270 1.15 3/32" BSW2.381 0.529 482.041 1.703 0.338 1.901/8" BSW 3.175 0.635 40 2.768 2.362 0.406 2.50 5/32" BSW 3.969 0.793 32 3.459 2.952 0.507 3.20 3/16" BSW 4.762 1.058 24 4.084 3.407 0.677 3.70 7/32" BSW 5.556 1.058 24 4.878 4.201 0.677 4.50 1/4" BSW 6.350 1.270 20 5.537 4.724 0.813 5.10 5/16" BSW 7.938 1.411 18 7.034 6.131 0.904 6.50 3/8" BSW 9.525 1.588 16 8.509 7.492 1.017 7.90 7/16" BSW 11.113 1.814 14 9.951 8.789 1.162 9.20 1/2" BSW 12.700 2.117 12 11.345 9.990 1.355 10.40 5/8" BSW 15.876 2.309 11 14.397 12.918 1.479 13.40 3/4" BSW 19.051 2.540 10 17.424 15.798 1.627 16.25 7/8" BSW 22.226 2.822 9 20.419 18.611 1.807 19.25 1" BSW 25.400 3.175 8 23.368 21.335 2.033 22.001 1/BSW 28.576 3.629 7 26.253 23.929 2.324 24.50 8"1 1/BSW 31.751 3.629 7 29.428 27.104 2.324 27.25 4"1 3/BSW 34.926 4.233 6 32.215 29.505 2.711 30.25 8"1 1/BSW 38.100 4.233 6 35.391 32.680 2.711 33.50 2"1 5/BSW 41.277 5.080 5 38.024 34.771 3.253 35.50 8"1 3/BSW 44.452 5.080 5 41.199 37.946 3.253 38.50 4"1 7/BSW 47.627 5.645 4 1/2 44.012 40.398 3.614 41.25 8"2" BSW 50.802 5.645 4 1/2 47.187 43.573 3.614 44.502 1/4"BSW 57.152 6.350 4 53.086 49.020 4.066 50.00 2 1/2"BSW 63.502 6.350 4 59.436 55.370 4.066 56.00 2 3/4"BSW 69.853 7.257 3 1/2 65.205 60.558 4.647 61.50 3" BSW 76.203 7.257 3 1/2 71.556 66.909 4.647 68.00 3 1/4"BSW 82.553 7.816 3 1/4 77.548 72.544 5.005 73.75 3 1/2"BSW 88.903 7.816 3 1/4 83.899 78.894 5.005 80.00 3 3/4"BSW 95.254 8.467 3 89.832 84.410 5.422 85.504" BSW 101.6048.467 3 96.182 90.760 5.422 92.004 1/ 4" BSW107.9548.835 2 7/8 102.297 96.639 5.657 98.004 1/ 2" BSW114.3048.835 2 7/8 108.647102.995.657 104.204 3/ 4" BSW120.6659.237 2 3/4 114.740108.6255.915 110.005" BSW 127.0059.237 2 3/4 121.090115.1765.915 116.505 1/ 4" BSW133.3559.677 2 5/8 127.159120.9636.196 122.505 1/ 2" BSW139.7059.677 2 5/8 133.509127.3136.196 128.505 3/ 4" BSW146.05510.162 1/2 139.549133.0436.506 134.506" BSW 152.40610.162 1/2 145.900139.3946.506 141.00英制普通螺纹-- 细牙-- BSF 英制普通螺纹(惠氏螺纹) -- 细牙(BSW)名义尺寸BSF 牙型代号大径mmd=D螺距mmp每英寸牙数tpi中径mmd2=D2小径外螺纹d3牙型高H1底孔直径mm3/16 BSF 4.763 0.794 32 4.255 3.747 0.508 4.00 7/32 BSF 5.556 0.907 28 4.975 4.394 0.581 4.60 1/4 BSF 6.350 0.977 26 5.725 5.100 0.625 5.30 9/32 BSF 7.142 0.977 26 6.518 5.893 0.625 6.10 5/16 BSF 7.938 1.156 22 7.199 6.459 0.739 6.80 3/8 BSF 9.525 1.27 20 8.712 7.899 0.813 8.30 7/16 BSF 11.113 1.411 18 10.209 9.304 0.904 9.70 1/2 BSF 12.700 1.588 16 11.684 10.668 1.017 11.10 9/16 BSF 14.288 1.588 16 13.272 12.256 1.017 12.70 5/8 BSF 15.875 1.814 14 14.712 13.549 1.162 14.00 11/16 BSF 17.463 1.814 14 16.300 15.137 1.162 15.50 3/4 BSF 19.050 2.117 12 17.693 16.336 1.355 16.75 13/16 BSF 20.638 2.117 12 19.281 17.924 1.355 18.25 7/8 BSF 22.225 2.309 11 20.747 19.269 1.479 19.75 1 BSF 25.400 2.54 10 23.774 22.148 1.627 22.75 1 1/8 BSF 28.575 2.822 9 26.769 24.963 1.807 26.50 1 1/4 BSF 31.750 2.822 9 29.944 28.138 1.807 28.75 1 3/8 BSF 34.925 3.175 8 32.893 30.861 2.033 31.50 1 1/2 BSF 38.100 3.175 8 36.068 34.036 2.033 34.50 1 5/8 BSF 41.275 3.175 8 39.243 37.211 2.033 38.001 3/4 BSF 44.450 3.629 7 42.126 39.802 2.324 40.502 BSF 50.800 3.629 7 48.476 46.152 2.324 47.00 2 1/4 BSF 57.150 4.234 6 54.440 51.730 2.711 53.00 2 1/2 BSF 63.500 4.234 6 60.790 58.080 2.711 59.002 3/4 BSF 69.850 4.234 6 67.140 64.430 2.711 -3 BSF 76.200 5.08 5 72.946 69.692 3.253 -3 1/4 BSF 82.550 5.085 79.296 76.042 3.253 -3 1/2 BSF 88.900 5.6454 1/2 85.285 81.670 3.614 -3 3/4 BSF 95.250 5.645 4 1/2 91.635 88.020 3.614 -4 BSF 101.600 5.645 4 1/2 97.985 94.370 3.614 -4 1/4 BSF 107.950 6.35 4 103.886 99.822 4.066 -螺纹标记的标注当螺纹精度要求较高时，除标注螺纹代号外，还应标注螺纹公差带代号和螺纹旋合长度。
公制英制美标内螺纹顶径公差
M9 X1.25 7.65 7.85(85%) 7.85(85%) 7.92(80%) 7.647 7.859 7.912 7.982
M10 X1.5 8.38 8.54(90%) 8.62(85%) 8.70(80%) 8.376 8.612 8.676 8.751
M11 X1.5 9.38 9.54(90%) 9.62(85%) 9.70(80%) 9.376 9.612 9.676 9.751
M14X2
※ 12.1(90%) 12.2(85%) 12.3(80%) 11.835 12.135 12.210 12.310
M16X2
※ 14.1(90%) 14.2(85%) 14.3(80%) 13.835 14.135 14.210 14.310
M18X2.5 15.3 15.6(90%) 15.7(85%) 15.8(80%) 15.294 15.649 15.744 15.854
M36X4
31.7 32.1(90%) 32.1(90%) 32.3(85%) 31.670 32.145 32.270 32.420
M39X4
34.7 35.1(90%) 35.1(90%) 35.3(85%) 34.670 35.145 35.270 35.420
M42X4.5
※ 37.6(90%) 37.6(90%) 37.9(85%) 37.129 37.659 37.799 37.979
* M5 X0.9 4.03 4.07(95%) 4.17(85%) 4.17(85%) 3.930 4.090 4.170 4.170 M5 X0.8 * 4.26(85%) 4.31(80%) 4.35(75%) 4.134 4.294 4.334 4.384
螺纹规格-美制、英制、公制对照表
螺纹规格-美制、英制、公制对照表螺纹规格-美制、英制、公制美制细牙UNF 2A 外螺纹大径UNFUN 2B内螺纹小径（UN、UNF）序号规格型号最大最小公差最小最大公差1 7/16"-20 11.079 10.874 0.206 9.728 10.033 0.3052 1/2"-20 12.667 12.461 0.206 11.328 11.608 0.2793 9/16"-18 14.252 14.031 0.221 12.751 13.081 0.3304 3/4"-16 19.012 18.773 0.239 17.323 17.678 0.3565 7/8"-14 22.184 21.923 0.262 20.269 20.676 0.406-12 26.944 26.655 0.290 24.689 25.146 0.4576 11/167 15/-12 33.294 33.005 0.290 31.039 31.496 0.457 168 15/-12 41.229 40.940 0.290 38.989 39.446 0.45789 17/-12 47.579 47.290 0.290 45.339 45.796 0.4578-12 63.452 63.162 0.290 61.214 61.671 0.457 10 21/2公制细牙6g外螺纹大径6H内螺纹小径1 M10*1 9.974 9.794 0.180 8.917 9.157 0.2402 M12*1.5 11.968 11.732 0.236 10.376 10.676 0.3003 M14*1.5 13.968 13.732 0.236 12.376 12.676 0.3004 M16*1.5 15.968 15.732 0.236 14.376 14.676 0.3005 M18*1.5 17.968 17.732 0.236 16.376 16.676 0.3006 M20*1.5 19.968 19.732 0.236 18.376 18.676 0.3007 M22*1.5 21.968 21.732 0.236 20.376 20.676 0.3008 M24*1.5 23.968 23.732 0.236 22.376 22.676 0.3009 M26*1.5 25.968 25.732 0.236 24.376 24.676 0.30010 M27*1.5 26.968 26.732 0.236 25.376 25.676 0.30011 M30*1.5 29.968 29.732 0.236 28.376 28.676 0.30012 M27*2 26.962 26.682 0.280 24.835 25.210 0.37513 M30*2 29.962 29.682 0.280 27.835 28.210 0.37514 M33*2 32.962 32.682 0.280 30.835 31.210 0.37515 M36*2 35.962 35.682 0.280 33.835 34.210 0.37516 M42*2 41.962 41.682 0.280 39.835 40.210 0.375 英制管螺纹1 G1/8-28 9.728 9.514 0.214 8.566 8.848 0.2822 G1/4-19 13.157 12.907 0.250 11.445 11.890 0.4453 G3/8-19 16.662 16.412 0.250 14.950 15.395 0.4454 G1/2-14 20.955 20.671 0.284 18.631 19.172 0.5415 G3/4-14 26.441 26.157 0.284 24.117 24.658 0.5416 G1-11 33.249 32.889 0.360 30.291 30.931 0.6407 G11/-11 41.910 41.550 0.360 38.952 39.592 0.6404-11 47.803 47.443 0.360 44.845 45.485 0.6408 G11/2公制/美制/英制螺纹对照表给大家分享一下 f NpX?,A型美制螺纹（UNF）常用规格-,!3,o iq外螺纹内螺纹UX x^Y2-4 9/16"-19牙14.28 13.08 8-j,M4D*&-6 11/16''-16 17.46 16.1 {lh szc-8 13/16''-16 20.64 19.28 cM iO|N@1-10 1''-14 25.40 23.57 h |t B-12 1(3/16)''-12 30.00 28.32 )Al{84<(}-16 1(7/16)''-12 36.51 34.67 Ys$3}LA{-20 1(11/16)''-12 42.86 41.02 SW7V7S*Qz{Akh02V@C型JIC37度美制UNF螺纹常用规格 (" G'W CLz -4 7/16”-20 11.11 10.03 -e~xb Qr-5 1/2”-20 12.70 11.32-6 9/16”-18 14.28 13.08 NH'YgL6*-8 3/4”-16 19.00 17.68 lxv;6S!J-10 7/8”-14 22.22 20.68 P|J&?KbC-12 1(1/16)"-12 26.98 25.15 Ki; ++-16 1(5/16)"-12 33.33 31.5 ZF!BkZ Uo-20 1(5/8)"-12 41.28 39.44 LX+c Z-24 1(7/8)"-12 47.62 45.8 iDP@c g-32 2(1/2)"-12 63.5 61.67 j/5j@^L\e w;h4y英制圆柱管螺纹（BSPP）常用规格 dApgz U@;-4 1/4”-19 13.157 11.55 |,hu r8BE\-6 3/8”-19 16.662 14.95 @"%@;>W<t< p=""> -8 1/2”-14 20.955 18.63 F)$7 ?')p-12 3/4”-14 26.441 24.11 Q} &f3?-16 1”-11 33.249 30.29 YZ@pwhZ<-20 1(1/4)''-11 41.91 38.95 SmU'a o.\<v{UpdB"]5英制圆锥管螺纹（BSPT）常用规格 b sDck <li< p="">基面大径基准距离 A4<q_07#< p="">1/4”-19 13.157 6}@E K'k3/8”-19 16.662 6.4 .gy5/-.SZ1/2”-14 20.955 8.2 R0?/'gt3/4”-14 26.441 9.5aF4L{'qK1”-11 33.249 10.4Q,Y do1(1/4)''-11 41.91 12.7 i'9m o0bmO@;ir e_^C X "TaT"(1美制圆锥管螺纹（NPT）mJ f1/8”-27 10.24 4 3VYo$g 1/4”-18 13.60 4 L8|v.?J 3/8”-18 17.04 4.32D[-ijs1/2”-14 21.22 4.48"Lx Hg]') 3/4”-14 26.57 4.75 GIry1”-11(1/2)”33.22 4.6 qBc!A~8K4' 1(1/4)”-11.5 41.96 4.83 </q_07#<></li<></t<>。
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英制、美制及公制螺纹基本尺寸及公差一、英制圆柱管螺纹BSPBSPP P的基本尺寸及公差（牙形角55º）螺纹代号基本直径内螺纹外螺纹大径中径小径中径公差小径公差A级B级中径公差大径公差中径公差大径公差G1/8″×28 9.728 9.147 8.566 +0.170 +0.282-0.107-0.214-0.214-0.214G1/4″×19 13.157 12.301 11.445 +0.125 +0.445 -0.125 -0.250 -0.250 0-0.250G3/8″×19 16.662 15.806 14.950 +0.125+0.445-0.125-0.250-0.250-0.250G1/2″×14 20.955 19.793 18.631 +0.142+0.541-0.142-0.284-0.284-0.284G5/8″×14 22.911 21.749 20.587 +0.142+0.541-0.142-0.284-0.284-0.284G3/4″×14 26.441 25.279 24.117 +0.142+0.541-0.142-0.284-0.284-0.284G1″×11 33.249 31.770 30.291 +0.180+0.640-0.180-0.360-0.360-0.360G1.1/4″×11 41.910 40.431 38.952 +0.180+0.640-0.180-0.360-0.360-0.360G1.1/2″×11 47.803 46.324 44.854 +0.180+0.640-0.180-0.360-0.360-0.360G2″×11 59.614 58.135 56.656 +0.180+0.640-0.180-0.360-0.360-0.360G2.1/2”X11 75.184 73.705 72.226 +0.217+0.640-0.217-0.434-0.434-0.434G3”X11 87.884 86.405 84.926 +0.217+0.640-0.217-0.434-0.434-0.434G3.1/2”X11 100.330 98.851 97.372 +0.217+0.640-0.217-0.434-0.434-0.434二、英制圆锥管螺纹（BSPTBSPTBSPT）的基本尺寸及公差（牙形角55º）螺纹代号基面上的直径基准长度有效螺纹长度圆锥内螺纹基面轴向位移偏差（±mm）大径中径小径基本最大最小基本最大最小R1/8″×28 9.728 9.147 8.566 4.0 4.9 3.1 6.5 7.4 5.6 1.1 R1/4″×19 13.157 12.301 11.445 6.0 7.3 4.7 9.7 11.0 8.4 1.7 R3/8″×19 16.662 15.806 14.950 6.4 7.7 5.1 10.1 11.4 8.8 1.7 R1/2″×14 20.955 19.793 18.631 8.2 10.0 6.4 13.2 15.0 11.4 2.3 R3/4″×14 26.441 25.279 24.117 9.5 11.3 7.7 14.5 16.3 12.7 2.3 R1″×11 33.249 31.770 30.291 10.4 12.7 8.1 16.8 19.1 14.5 2.9 R1.1/4″×11 41.910 40.431 38.952 12.7 15.0 10.4 19.1 21.4 16.8 2.9 R1.1/2″×11 47.803 46.324 44.845 12.7 15.0 10.4 19.1 21.4 16.8 2.9 R2″×11 59.614 58.135 56.656 15.9 18.2 13.6 23.4 25.7 21.1 2.9 R2.1/2”X11 75.184 73.705 72.226 17.5 21.0 14.0 26.7 30.2 23.2 3.5 R3”X11 87.884 86.405 84.926 20.6 24.1 17.1 29.8 33.3 26.3 3.5 R3.1/2”X11 100.330 98.851 97.372 22.2 25.7 18.7 31.4 34.9 27.9 3.5三、美制管螺纹（UN(F)UN(F)UN(F)）基本尺寸及公差（牙形角60º）螺纹代号外螺纹内螺纹公差等级公差等级2A 2B大径中径小径小径中径大径最大最小最大最小最小最大最小最大JIC螺纹7/16″×20UNF 11.079 10.874 10.254 10.147 9.568 9.728 10.033 10.287 10.424 11.113 1/2″×20UNF 12.667 12.461 11.841 11.732 11.156 11.328 11.608 11.875 12.017 12.7 9/16″×18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.288 3/4″×16UNF 19.012 18.773 17.981 17.854 17.12 17.323 17.678 18.019 18.184 19.05 7/8″×14UNF 22.184 21.923 21.006 20.869 20.025 20.269 20.676 21.046 21.224 22.225 1-1/16″×12UN 26.944 26.655 25.57 25.425 24.425 24.689 25.146 25.613 25.801 26.988 1-5/16″×12UN 33.294 33.005 31.92 31.773 30.775 31.039 31.496 31.963 32.154 33.338 1-5/8″×12UN 41.229 40.94 39.885 39.705 38.71 38.989 39.446 39.901 40.094 41.275 1-7/8″×12UN 47.579 47.29 46.205 46.053 45.06 45.339 45.796 46.251 46.449 47.625 2-1/2″×12UN 63.452 63.162 62.078 61.92 60.932 61.214 61.671 62.126 62.332 63.5ORFS螺纹9/16″×18UNF 14.252 14.031 13.335 13.221 12.573 12.751 13.081 13.371 13.52 14.288 11/16″×16UN 17.427 17.188 16.396 16.274 15.535 15.748 16.104 16.431 16.589 17.463 13/16″×16UN 20.599 20.361 19.568 19.444 18.707 18.923 19.279 19.606 19.766 20.638 1″×14UNF 25.357 25.095 24.178 24.036 23.195 23.444 23.825 24.221 24.407 25.4 1-3/16″×12UN 30.119 29.83 28.745 28.598 27.6 27.864 28.321 28.788 28.979 30.163 1-7/16″×12UN 36.467 36.177 35.093 34.943 33.947 34.214 34.671 35.138 35.331 36.513 1-11/16″×12UN 42.817 42.527 41.443 41.29 40.297 40.564 41.021 41.488 41.686 42.863 2″×12UN 50.754 50.465 49.38 49.225 48.235 48.514 48.971 49.426 49.627 50.8SAE螺纹5/8″×18UNF 15.839 15.618 14.923 14.803 14.161 14.351 14.681 14.958 15.11 15.875 1-1/16″×14UN 26.947 26.683 25.743 25.608 24.74 24.968 25.375 25.783 25.961 26.987其它美制螺纹9/16″×16UN 14.252 14.013 13.221 13.101 12.36 12.573 12.929 13.256 13.411 14.288 7/8″×12UN 22.182 21.892 20.808 20.668 19.662 19.939 20.396 20.851 21.034 22.225 2-1/4″×12UN 57.104 56.815 55.73 55.575 54.585 54.864 55.321 55.776 55.976 57.15 注：UNC粗牙螺纹系列，UNF细牙螺纹系列，UNEF超细牙螺纹系列，UN不变螺距系列四、布锥管螺纹（NPTNPTNPT）基本尺寸及公差(牙形角60º)螺纹代号基面上的直径螺纹长度大径中径小径有效长度管端至基面长Z1/8″×27 10.272 9.519 8.766 7 4.572 Z1/4″×18 13.572 12.443 11.314 9.5 5.080 Z3/8″×18 17.055 15.926 14.797 10.5 6.096 Z1/2″×14 21.223 19.772 18.321 13.5 8.028 Z3/4″×14 26.568 25.117 23.666 14 8.611 Z1″×11.5 33.228 31.461 29.694 17.5 10.160 Z1.1/4″×11.5 41.985 40.218 38.451 18 10.688 Z1.1/2″×11.5 48.054 46.287 44.520 18.5 10.688 Z2″×11.5 60.092 58.325 56.558 19 11.074五、公制螺纹基本尺寸及公差(牙形角60º)螺纹代号基本直径内螺纹外螺纹大径中径小径公差等级公差等级6H 7H 6g中径公差小径公差中径公差小径公差中径公差大径公差M10X1 10 9.350 8.917 +0.150+0.236+0.190+0.300-0.026-0.138-0.026-0.206M12X1 12 11.350 10.917 +0.160+0.236+0.200+0.300-0.026-0.144-0.026-0.206M14X1 14 13.350 12.917 +0.160+0.236+0.200+0.300-0.026-0.144-0.026-0.206M12X1.25 12 11.188 10.647 +0.180+0.265+0.224+0.335-0.028-0.160-0.028-0.240M14X1.25 14 13.188 12.647 +0.180+0.265+0.224+0.335-0.028-0.160-0.028-0.240M12X1.5 12 11.026 10.376 +0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M14X1.5 14 13.026 12.376 +0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M16X1.5 16 15.026 14.376 +0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M18X1.5 18 17.026 16.373 +0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M20X1.5 20 19.026 18.376 +0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M22X1.5 22 21.026 20.376 +0.190+0.300+0.236+0.375-0.032-0.172-0.032-0.268M24X1.5 24 23.026 22.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M26X1.5 26 25.026 24.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M27X1.5 27 26.026 25.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M30X1.5 30 29.026 28.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M33X1.5 33 32.026 31.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M36X1.5 36 35.026 34.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M39X1.5 39 38.026 37.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M42X1.5 42 41.026 40.376 +0.200+0.300+0.250+0.375-0.032-0.182-0.032-0.268M27X2 27 25.701 24.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M30X2 30 28.701 27.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M33X2 33 31.701 30.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M36X2 36 34.701 33.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M39X2 39 37.701 36.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M42X2 42 40.701 39.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M45X2 45 43.701 42.835 +0.224+0.375+0.280+0.475-0.038-0.208-0.038-0.318M52X2 52 50.701 49.835 +0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318M60X2 60 58.701 57.835 +0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318M64X2 64 62.701 61.835 +0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318M72X2 72 70.701 69.835 +0.236+0.375+0.300+0.475-0.038-0.218-0.038-0.318。