公制美制螺纹牙距表
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
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。
公制、英制、美制螺纹标准钻孔底径
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)M1.40.31.1M1.60.351.2(1.25)M1.80.351.4(1.45)M20.41.6M2.20.451.7(1.75)M2.50.452.0(2.05)M30.52.5M3.50.62.9M40.73.3M4.50.753.7M50.84.2M615M716M81.256.8M91.257.8M101.58.5M111.59.5M121.7510.2M14212M16214M182.515.5M202.517.5M222.519.5M24321M27324M303.526.5M333.529.5M36432M39435M424.537.5M454.540.5M48543M52547M565.550.5M2.50.352.1(2.15)M30.352.6(2.65)M3.50.353.1(3.15)M40.53.5M4.50.54M50.54.5M5.50.55M60.755.2M70.756.2M80.757.217M90.758.218M100.759.2191.258.8M110.7510.2110M121111.2510.81.510.5M141131.2512.81.512.5M151141.513.5M161151.514.5M171161.515.5M181171.516.5216M201191.518.5218M22121M241231.522.5222124M251.523.5223126M271.525.5225127M281.526.5226129M301.528.5228327M321.530.52301.531.5M33231330M351.533.51.534.5M36234333M381.536.5M39 1.537.5237336M401.538.5238337M421.540.52403394381.543.51/16601.153/32481.81/8402.65/32323.13/16243.67/32244.41/4205.19/32205.81.520.5220M45243342441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)5/16186.53/8167.97/16149.31/21210.59/1612121113.511/1611153/4106.513/1610187/8919.25920.751"8221.1/8724.751.1/4727.751.3/8630.51.1/2633.51.5/8535.51.3/45391.7/84.541.55/82"4.544.52.1/44502.1/2456.52.3/43.5623"3.568.5324284.7265.4266.2226.8208.3189.81611.21612.714141415.7512171218.511201121.751023926929832835837.5740743746.5652658.5664.5569.75205.1186.6168149.41310.81212.21113.51016.5919.5822.25725728630.75634539.54.5454.551.5457.25463.5470285.5246.9248.5209.92011.51812.91814.51617.51420.41223.251226.51229.51232.751236325.5327.1328.62810.12811.724132414.752017.52019.252020.752022.252023.751826.751830183318362416.25288.8288.6278.51911.81911.518111915.2519151814.514191418.5141814211424.5142414231428.251130.751130.2511.5291818141411.511.51518.52430278.91135.51139.5113911.53811.53911421145114511.54411.5451149.611571156.511.55611.5571163.31179.111511172.81171.48678681185.5883884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#1-641.5(1.55)5456#2-561.8(1.85)6448#3-482.175402.3(2.35)8640#5-402.6(2.65)9632#6-322.8(2.85)10732#8-323.511824#10-243.9131024#12-244.51511#4-4080#0-801.2(1.25)4372#1-721.5(1.55)5464#2-641.964562.1(2.15)7548#4-482.48644#5-442.79640#6-402.9(2.95)10736#8-363.511832#10-324.11310#3-5628#12-284.71511制订:审核:日期:公制,英制,美制螺纹标准谢敬锋。
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。
螺纹牙距表
螺纹牙距表螺距（P）：相邻牙在中径线上对应两点的轴向距离或相邻牙山或牙谷间的距离。
1、公制牙距直接以距离（毫米mm）标识。
2、美制或英制是以每1英寸单位内，包含的牙的个数来标识。
3、对统一标准螺纹，直径小于1/4英寸的，以号数来标识。
公制螺纹牙距表美制 统一标准螺纹牙数表公称直径牙距 mm公称直径直径尺寸牙距＝每英寸牙数毫米粗牙细牙号＜ 1/4"英寸 in毫米 mm粗牙 UNC细牙 UNF M10.250.20#0.06 1.524-80 M1.20.250.21#0.073 1.8546472 M1.60.350.22#0.086 2.1845664 M20.40.253#0.099 2.5154856 M2.50.450.354#0.112 2.8454048 M30.50.355#0.125 3.1754044 M40.70.56#0.138 3.5053240 M50.80.58#0.164 4.1663236 M610.7510#0.19 4.8262432 M8 1.25112#0.216 5.4862428 M10 1.5 1.251/4"0.25 6.352028 M12 1.75 1.255/16"0.31257.9381824 M142 1.53/8"0.3759.5251624 M162 1.57/16"0.437511.1131420 M18 2.5 1.51/2"0.512.71320 M20 2.5 1.59/16"0.562514.2881218 M22 2.5 1.55/8"0.62515.8751118 M24323/4"0.7519.051016 M27327/8"0.87522.225914 M30 3.521"125.4812 (M33) 3.521-1/8" 1.12528.575712 M36431-1/4" 1.2531.75712(M39)431-3/8" 1.37534.925612 M42 4.531-1/2" 1.538.1612 (M45) 4.531-3/4" 1.7544.455-M48532"250.8 4.5-自攻螺钉牙距表公称牙距公称AB 牙 A 牙ST1.50.54#2424ST1.90.65#2020ST2.20.86#2018ST2.60.97#1916ST2.9 1.18#1815ST3.3 1.310#1612ST3.5 1.312#1411ST3.9 1.414#1410ST4.2 1.4日本墙板钉ST4.8 1.6公称粗牙细牙ST5.5 1.86#918ST6.3 1.87#916ST8.0 2.18#915ST9.5 2.110#8127英制螺纹－惠氏螺纹牙数表公称直径尺寸牙距＝每英寸牙数无号数英寸 in毫米 mm粗牙 BSW细牙 BSF3/32"0.0938 2.38148-1/8"0.125 3.17540-5/32"0.1563 3.96932-3/16"0.1875 4.76324321/4"0.25 6.3520265/16"0.31257.93818223/8"0.3759.52516207/16"0.437511.11314181/2"0.512.71216 5/8"0.62515.8751114 3/4"0.7519.051012 7/8"0.87522.225911 1"125.4810 1-1/8" 1.12528.57579 1-1/4" 1.2531.7579 1-1/2" 1.538.168 1-3/4" 1.7544.4557 2"250.8 4.57。