美制锥管螺纹尺寸表
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。
NPT螺纹尺寸-npt螺纹规格
NPT英制螺纹标准与技术数据螺纹规格螺距外径C1 底径螺纹标号螺牙角度备注NPT1/4 1、411 13、616 18 60NPT3/8 1、411 17、055 18 60NPT1/2 1、814 21、223 14 60NPT5/8 1、814 26、568 14 60NPT1 2、208 33、227 11 1/2 60NPT1 1/4 2、208 41、984 11 1/2 60NPT1 1/2 2、208 48、053 11 1/2 60NPT2 2、208 60、091 11 1/2 60NPT2 1/2 3、175 72、699 8 60NPT3 3、175 88、608 8 60NPT3 1/2 3、175 100、013 8 60PT:美国标准得60度锥管螺纹美制一般密封管螺纹得基本尺寸:尺寸代号牙数n螺距P牙型高度h基准平面内得基本直径基准距离L1装配余量L3外螺纹小端面内得基本小径大径d=D中径d1=D2小径d1=D1mm 圈数mm 圈数mm mm1/16 27 0、941 0、752 7、894 7、142 6、389 4、32 4、064 3 2、822 6、137 1/8 27 0、941 0、752 10、242 9、489 8、737 4、36 4、102 3 2、822 8、481 1/4 18 1、411 1、129 13、616 12、487 11、358 4、10 5、785 3 4、233 10、996 3/8 18 1、411 1、129 17、055 15、926 14、797 4、32 6、096 3 4、233 14、417 1/2 14 1、814 1、451 21、224 19、772 18、321 4、48 8、128 3 5、443 17、813 3/4 14 1、814 1、451 26、569 25、117 23、666 4、75 8、618 3 5、443 23、1271 11、5 2、209 1、767 33、228 31、461 29、694 4、60 10、160 3 6、626 29、06011/411、5 2、209 1、767 41、985 40、218 38、451 4、83 10、668 3 6、350 37、788 11/211、5 2、209 1、767 48、054 46、287 44、520 4、83 10、668 3 6、350 43、8532 11、5 2、209 1、767 60、092 58、325 56、558 5、01 11、0653 6、350 55、86721/28 3、175 2、540 72、699 70、159 67、619 5、46 17、335 2 6、350 66、5353 8 3、175 2、540 88、608 86、068 83、528 6、13 19、463 2 6、350 62、31131/28 3、175 2、540 101、316 98、776 96、236 6、57 20、860 2 6、350 94、9324 8 3、175 2、540 113、973 111、433 108、893 6、75 21、431 2 6、350 107、5545 8 3、175 2、540 140、952 138、412 135、872 7、50 23、812 2 6、350 134、3846 8 3、175 2、540 167、792 165、252 162、712 7、66 24、320 2 6、350 161、1918 8 3、175 2、540 218、441 215、901 213、361 8、50 26、988 2 6、350 211、67310 8 3、175 2、540 272、312 269、772 267、232 9、68 30、734 2 6、350 265、31112 8 3、175 2、540 323、032 320、492 317、952 10、88 34、544 2 6、350 315、793 14O、D、8 3、175 2、540 354、904 352、364 349、824 12、50 39、688 2 6、350 347、345 16O、D、8 3、175 2、540 405、784 403、244 400、704 14、50 46、038 2 6、350 397、828 18O、D、8 3、175 2、540 456、565 454、025 451、485 16、00 50、800 2 6、350 448、310 20O、D、8 3、175 2、540 507、246 504、706 502、166 17、00 53、975 2 6、350 498、792 24O、D、8 3、175 2、540 608、608 606、068 603、528 19、00 60、325 2 6、350 599、758注: ①可参考表中得最右边一列数据选择攻丝前得麻花钻直径;②螺纹收尾长度(V)为3、47 P;③O、D、就是英文管子外径(outside diameter)得缩写。
美制NPSM螺纹
8
0.0022
2.841
2.826
2.7600
2.7526
2.708
2.727
2.7622
2.7720
3
8
0.0023
3.467
3.452
3.3862
3.3786
3.334
3.353
3.3885
3.3.968
3.953
3.8865
3.8788
3.835
3.848
采用符合8（d）节规定的量规检查时在牙顶和牙底处不发生干涉。
3.本表取自美国联邦螺纹标准手册H28 P363航空标准化编辑部出
NPSM机械连接（自由配合）用直管内螺纹和外螺纹的尺寸（英制）
管子公称尺寸
每英寸牙数
2A极外螺纹
2B级内螺纹
容隙
大径
中径
小径
中径
最大
最小
最大
最小
最小
最大
最小a
最大
1
2
3
4
5
6
7
8
9
10
11
1/8
27
0.0011
0.397
0.390
0.3725
0.3689
0.358
0.364
0.3736
0.3763
1/4
3.8888
3.8988
4
8
0.0023
4.466
4.451
4.3848
4.3771
4.333
4.346
4.3871
4.3971
5
8
0.0024
5.528
5.513
各国标准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) 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)R4 4"113.032.30911111.551110.0721.479R5 5"138.432.30911136.951135.4721.479R66"163.832.30911162.351160.8721.479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)转载▼标签：杂谈表（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=D1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)螺纹标准的一种，按外形分圆柱、圆锥两种；按牙型角分55°、60°两种。
各国标准螺纹基本尺寸对照表
英制锥管螺纹基本尺寸及公差牙形角55ºBSPT公制螺纹基本尺寸及公差牙形角60ºM55°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BSPTR66" 11聊城市鑫茂祥管业有限公司专业经营钢管规格：5mm1mm—1020mm200mm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;适用于工程、煤矿、纺织、电力、锅炉、机械、军工等各个领域;公司以良好的信用、优质的产品、雄厚的实力、低廉的价钱享誉全国30多个省、市、自治区、直辖市及国外,产品深得用户依赖;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 1/8 28 1/4 19 3/8 19 1/2 14 3/4 14 1 11 4 11 2 11 2 112 113 11 2 11锥管螺纹的基本尺寸表3-281/2PT 、1/2NPT表2螺纹基本尺寸单位:mm螺纹标准的一种,按外形分圆柱、圆锥两种；按牙型角分55°、60°两种;螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径,单位是英寸;一吋等于8分,1/4 吋就是2分,如此类推;国外常用英制螺纹的代号、名称和标准号：标准惠氏粗牙系列,一般用途圆柱螺纹标准惠氏细牙系列,一般用途圆柱螺纹附加的惠氏可选择系列,一般用途圆柱螺纹Whit 惠氏牙型的非标准螺纹以上为英国标准BS84 牙型角为55°的英制螺纹UN 恒定螺距系列的统一螺纹UNC 粗牙系列的统一螺纹UNF 细牙系列的统一螺纹UNEF 超细牙系列的统一螺纹UNS①特殊系列的统一螺纹UNR 圆弧牙底恒定螺距系列的统一螺纹UNRC 圆弧牙底粗牙系列统一螺纹UNRF 圆弧牙底细牙系列统一螺纹UNREF 圆弧牙底超细牙系列统一螺纹UNRS 圆弧牙底特殊系列统一螺纹以上为美国标准标准牙型牙底是平的或随意倒圆的的内、外螺纹圆弧牙底的UNR、UNRC、UNRF、UNRE F、NRS只用于外螺纹而没有内螺纹NPT②一般用途的锥管螺纹NPSC 管接头用直管螺纹NPTR 导杆连接用锥管螺纹NPSM 机械连接用直管螺纹NPSL 锁紧螺母用直管螺纹NPSH 软管连接用直管螺纹以上为美国标准牙型角为60°的英制管螺纹NPTF 干密封标准型锥管螺纹美国标准Ⅰ型PTF-SAE SHORT 干密封短型锥管螺纹美国标准Ⅱ型NPSF 干密封标准型燃油用直管内螺纹美国标准Ⅲ型NPS1 干密封标准型一般用直管内螺纹美国标准Ⅳ型ACME③一般用途的梯形螺纹美国标准牙型角为29°的英制传动螺纹①尺寸和公差使用与标准系列相同的公式计算的标准系列之外的所有直径与螺距组合;②我国的60°圆锥管螺纹GB/T12716-1991与之等效;③ACME螺纹包括一般用途的和定心的两种配合的梯形螺纹,其中一般用途者与我国标准GB/T5796-1986规定的梯形螺纹的性能相类同;螺距用每英寸的牙数来表示,如：每英寸11牙,则螺距＝11＝螺纹如何区分英制和公制默认分类2009-08-24 22:03:14 阅读1281 评论0 字号：大中小粗略判断的话好像英制的比公职的牙距大同规格的NPT,PT,G 都是管螺纹．NPT 是National American Pipe Thread 的縮寫,屬於美国標准的60 度锥管螺纹,用於北美地區．国家標准可查阅GB/T12716-1991PT 是Pipe Thread 的縮寫,是55 度密封圓锥管螺纹,屬惠氏螺紋家族,多用於欧洲及英联邦国家．常用於水及煤气管行业,锥度規定为1:16．国家標准可查阅GB/T7306-2000G 是55 度非螺纹密封管螺纹,屬惠氏螺紋家族．标记为G 代表圓柱螺紋．国家標准可查阅GB/T730 7-2001另外螺纹中的1/4、1/2、1/8 标记是指螺紋尺寸的直徑,單位是英吋．行內人通常用分來稱呼螺紋尺寸,一吋等於８分,1/4 吋就是２分,如此類推G 好像就是管螺纹的统称Guan,55,60度的划分属于功能性的,俗称管圆;即螺纹由一圆柱面加工而成;ZG俗称管锥,即螺纹由一圆锥面加工而成,一般的水管接头都是这样的,老国标标注为Rc公制螺纹用螺距来表示,美英制螺纹用每英寸内的螺纹牙数来表示,这是它们最大的区别,公制螺纹是60度等边牙型,英制螺纹是等腰55度牙型,美制螺纹60度;公制螺纹用公制单位, 美英制螺纹用英制单位;管螺纹主要用来进行管道的连接,其内外螺纹的配合紧密,有直管与锥管两种;公称直径是指所连接的管道直径,显然螺纹大径比公称直径大;1/4,1/2,1/8是英制螺纹的公称直径,单位是英寸;英制螺纹标准规格表寸Ww 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mm1/16" BSW 603/32" BSW 481/8" BSW 405/32" BSW 323/16" BSW 247/32" BSW 241/4" BSW 205/16" BSW 183/8" BSW 167/16" BSW 141/2" BSW 125/8" BSW 113/4" BSW 107/8" BSW 9 1" BSW 81 1/8"BSW 71 1/4"BSW 71 3/8"BSW 61 1/2"BSW 61 5/8"BSW 51 3/4"BSW 51 7/8"BSW 4 1/2 2" BSW 4 1/2 2 1/4BSW 4"2 1/2"BSW 42 3/4"BSW 3 1/2 3" BSW 3 1/2 3 1/4"BSW 3 1/4 3 1/2"BSW 3 1/4 3 3/4"BSW 3 4" BSW 34 1/4"BSW 2 7/8 4 1/2"BSW 2 7/8 4 3/4"BSW 2 3/4 5" BSW 2 3/4 5 1/4"BSW 2 5/8 5 1/2"BSW 2 5/8 5 3/4"BSW 2 1/2 6" BSW 2 1/2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 32 7/32 BSF 28 1/4 BSF 26 9/32 BSF 26 5/16 BSF 22 3/8 BSF 20 7/16 BSF 18 1/2 BSF 169/16 BSF 165/8 BSF 1411/16 BSF 143/4 BSF 1213/16 BSF 127/8 BSF 111 BSF 101 1/8 BSF 91 1/4 BSF 91 3/8 BSF 81 1/2 BSF 81 5/8 BSF 81 3/4 BSF 72 BSF 72 1/4 BSF 62 1/2 BSF 62 3/4 BSF 6 -3 BSF 5 -3 1/4 BSF5 -3 1/2 BSF4 1/2 -3 3/4 BSF 4 1/2 -4 BSF 4 1/2 -4 1/4 BSF 4 -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;螺纹标记的标注格式为：螺纹代号—螺纹公差带代号中径、顶径—旋合长度有关标注内容的说明：1 公差带代号由数字加字母表示内螺纹用大写字母,外螺纹用小写字母,如7H、6g等,应特别指出,7H,6g等代表螺纹公差,而H7,g6代表圆柱体公差代号;2 旋合长度规定为短用S表示、中用N表示、长用L表示三种;一般情况下,不标注螺纹旋合长度,其螺纹公差带按中等旋合长度N确定;必要时,可加注旋合长度代号S或L,如“M20-5g6g－L”;特殊需要时,可注明旋合长度的数值,如“M20-5g6g－30”;相关链接。
NPT美国标准的60度锥管螺纹
23.666
4.75 8.618 3 5.443 23.127
1
11.5 2.209 1.767 33.228
11/4 11.5 2.209 1.767 41.985
11/2 11.5 2.209 1.767 48.054
2
11.5 2.209 1.767 60.092
21/2
8 3.175 2.540 72.699
NPT：美国标准的 60 度锥管螺纹
美制一般密封管螺纹的基本尺寸：
基准平面内的基本直径
外螺纹
牙型
螺距
小端面
尺寸 牙数 P
代号
n
高度 h
大径 d=D
中径 d1=D2
小径 d1=D1
基准距离 L1 装配余量 L3
内的基 本小径
mm
圈数 mm 圈数 mm
mm
1/16 27 0.941 0.752 7.894
320.492
317.952 10.88 34.544 2 6.350 315.793
14O.D. 8 3.175 2.540 354.904
352.364
349.824 12.50 39.688 2 6.350 347.345
16O.D. 8 3.175 2.540 405.784
403.244
400.704 14.50 46.038 2 6.350 397.828
3
8 3.175 2.540 88.608
86.068
83.528
6.13 19.463 2 6.350 62.311
31/2
8 3.175 2.540 101.316
98.776
96.236
6.57 20.860 2 6.350 94.932
英制管螺纹美制管螺纹对照表
英制管螺纹美制管螺纹对照表英制管螺纹美制管螺纹对照表(若需要原件请留言) 2008-06-03 16:57分类:专业知识字号: 大中小英制管螺纹美制管螺纹对照表英制管螺纹英制管螺纹美制管螺纹钻孔径标准径有交牙钻孔径标准长部之长度(最NPT 规格标准径规格不用纹刀度(最小)中规格最大最小使用纹刀时小)中之毋螺NPS 时之毋螺牙内径使用绞刀时不用绞刀时牙内径PS 1/16-28 6.50 6.632 6.490 PT 1/16-28 6.10 6.20 6.244 6.384 1/16 - 27 6.10 6.25 6.35 PS 1/8-28 8.50 8.637 8.495 PT 1/8-28 8.10 8.20 8.249 8.388 1/8 - 27 8.33 8.43 8.7411.0PS 1/4-19 11.40 11.549 11.341 PT 1/4 -19 10.70 10.962 11.174 1/4 - 18 10.72 11.13 11.13 014.5PS 3/8-19 15.00 15.054 14.846 PT 3/8 -19 14.20 14.448 14.658 3/8 - 18 14.27 14.27 14.68 018.0PS 1/2-14 18.50 18.773 18.489 PT 1 /2-14 17.60 17.979 18.263 1/2 - 14 17.48 17.86 18.26 023.5PS 3/4-14 24.00 24.259 23.975 PT 3/4 -14 23.00 23.378 23.663 3/4 - 14 22.63 23.01 23.42 029.5PS 1-11 30.20 30.471 30.111 PT 1 -11 29.00 29.459 29.822 1 - 11-1/2 28.58 28.98 29.36 0electricity at no cost, revenue from electricity sales. Poverty alleviation to the removal, to desperate farmers out of poverty, in conjunction with urbanization, new communities are centrally placed. Poverty in the enterprise, enterprise more powerful, more social responsibility, they should allow more people to enjoy the fruits of development. Conditions to encourage private enterprises to establish Charity Fund for poverty alleviation, employment, grants, financial aid and other forms of poverty alleviation activities, let povertyalleviation aid corporate social responsibility in the specific embodiment, the proper meaning of giving back to the community. Finally reveals to implement poverty alleviation policies, older age, incapacity, cannot be achieved through industry support and employment support, such as poverty, children and unable to support the poor, Lo-Fi policyreveals the role to play, eventually incorporated into the low range,and fundamentally solve the problem of poverty. (C) establishing and perfecting retreat mechanism. Poverty alleviation is a dynamic project, we must strengthen the farmers ' information management, dynamic management of poor, really "poor" no place to hide, "poverty" a timely exit, "poor" and "return to the poor" get maximum support and help. To build up the information network system of the poor, poverty the basic information and dynamic entry to the system, to implement dynamic management. According to pro-poor development, timely adjustment on38.0PS 1-1/4-11 38.80 39.132 38.772 PT 1 -1/4-11 37.50 37.976 38.339 1-1/4-11-1/2 37.31 37.69 38.10 044.0PS 1-1/2-11 44.80 45.025 44.665 PT 1 -1/2-11 43.40 43.869 44.232 1-1/2-11-1/2 43.66 44.04 44.45 055.5PS 2 - 11 56.50 56.836 56.476 PT 2 - 11 54.90 55.412 55.844 0NPT螺纹PT螺纹G螺纹和公制螺纹的区别NPT，PT，G 都是管螺纹(( PS——日本管螺纹 )NPT 是 National (American) Pipe Thread 的缩写，属于美国标准的 60 度锥管螺纹，用于北美地区(国家标准可查阅 GB/T12716-1991 PT 是 Pipe Thread 的缩写，是 55 度密封圆锥管螺纹，属惠氏螺纹家族，多用于欧洲及英联邦国家(常用于水及煤气管行业，锥度规定为 1:16( 国家标准可查阅 GB/T7306-2000G 是 55 度非螺纹密封管螺纹，属惠氏螺纹家族(标记为 G 代表圆柱螺纹(国家标准可查阅 GB/T7307-2001另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英吋(行内人通常用分来称呼螺纹尺寸，一吋等于,分，1/4 吋就是,分，如此类推(G 就是管螺纹的统称(Guan)，55，60度的划分属于功能性的，俗称管圆。
美制管螺纹尺寸表[美制螺纹标准对照表]
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美制管螺纹尺寸表[美制螺纹标准对照表]美制螺纹标准对照表每英寸牙数 8-32 (0.164-32) 10-24 (0.190-24) 12-24 (0.216-24) 1/4-20 (0.250-20) 5/16-18 (0.3175-18) 3/8-16 (0.375-16)7/16-14 (0.4375-14) 1/2-13 (0.50-13) 9/16-12 (0.5625-12) 5/8-11 (0.625-11) 3/4-10 (0.750-10) 7/8-9 (0.875-9) 1"-8 (1.000-8)UNC美制外螺纹（2A）常用规格极限尺寸附注（粗牙）大径极限最小 0.1571 3.9903 0.1818 4.6177 0.2078 5.2781 0.2408 6.1163 0.3026 7.6860 0.3643 9.2532 0.4258 10.81530.4876 12.3850 0.5495 13.9573 0.6113 15.5270 0.7353 18.6766 0.8592 21.8237 0.9830 24.9682最大 0.1631 4.1427 0.1890 4.8006 0.2150 5.4610 0.24896.3221 0.31137.9070 0.3737 9.4920 0.4361 11.0769 0.498512.6619 0.5609 14.2469 0.6234 15.8344 0.7482 19.0043 0.8731 22.1767 0.9980 25.3492中径极限最小 0.1399 3.5535 0.1586 4.0284 0.1845 4.6863 0.2127 5.4026 0.2712 6.8885 0.3287 8.3490 0.3850 9.77900.4435 11.2649 0.5016 12.7406 0.5589 14.1961 0.6773 17.2034 0.7946 20.1828 0.9100 23.1140最大 0.1428 3.6271 0.1619 4.1123 0.1879 4.7727 0.21645.4966 0.27526.9901 0.3331 8.4607 0.3897 9.8984 0.448511.3919 0.5068 12.8727 0.5644 14.3358 0.6832 17.3533 0.8009 20.3429 0.9168 23.2867代号小径max0.1248 3.1699 0.1379 3.5027 0.1639 4.1631 0.1876 4.7650 0.2431 6.1747 0.2970 7.5438 0.3485 8.8519 0.4041 10.26410.4587 11.6510 0.5119 13.0023 0.6255 15.8877 0.7368 18.7147 0.8446 21.4528最小 3.58 4.07 4.72 5.45 6.94 8.40 9.83 11.34 12.80 14.27 17.28 20.27 23.22螺胚直径最大 3.61 4.10 4.75 5.48 6.98 8.44 9.87 11.38 12.84 14.32 17.33 20.32 23.27公称尺寸和螺纹系列1.螺胚直径指滚丝前的尺寸，数值为依历练公式计算而得，在实践中需验证。
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。
美制英制公制螺纹孔尺寸表
螺纹规格-美制、英制、公制公制/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。
NPT美国60°锥管螺纹尺寸标准与数据
.度锥管螺纹：美国标准的60NPT美制一般密封管螺纹的基本尺寸：外螺纹基准平面内的基本直径牙型装配余小端面螺距L1 基准距离高度小径大径中径牙L3 内的基P 量尺寸h d1=D1 d=D d1=D2 数本小径代号n圈圈数mmmm mm mm 数6.137 3 2.822 7.142 6.389 4.32 4.064 1/16 27 0.941 0.7527.8948.481 3 2.822 9.489 8.737 4.36 4.102 1/8 27 0.941 0.752 10.24210.996 3 4.233 11.358 4.10 5.785 1/4 18 1.411 1.129 13.616 12.48714.417 3 4.233 14.797 4.32 6.096 3/8 18 1.411 1.129 17.055 15.92617.813 4.48 18.321 8.128 3 5.443 1/2 14 1.814 1.451 21.224 19.77223.127 4.75 8.618 3 5.443 14 1.814 1.451 26.569 25.117 23.666 3/429.060 29.694 4.60 10.160 3 6.626 1 11.5 2.209 1.767 33.228 31.46137.788 38.451 4.83 10.668 3 6.350 11.5 2.209 1.767 41.985 40.218 11/4 43.853 4.83 10.668 3 6.350 2.209 1.767 48.054 46.287 44.520 11/2 11.5 55.867 5.01 11.065 3 6.350 2.209 1.767 60.092 58.325 56.558 2 11.566.535 5.46 17.335 2 6.350 2.540 72.699 70.159 67.619 21/2 8 3.17562.311 19.463 2 6.350 88.608 86.068 83.528 6.13 3 8 3.175 2.54094.932 20.860 2 6.350 101.316 98.776 96.236 6.57 31/2 8 3.175 2.540107.554 21.431 2 6.350 113.973 111.433 108.893 6.75 4 8 3.175 2.540 134.384 138.412 135.872 7.50 23.812 2 6.350 3.175 5 8 2.540 140.952 161.191 165.252 162.712 7.66 24.320 2 6.350 6 8 3.175 2.540 167.792 211.673 213.361 8.50 26.988 2 6.350 8 3.175 2.540 218.441 215.901 8 265.311 267.232 9.68 30.734 2 6.350 3.175 2.540 272.312 269.772 10 8 315.793 34.544 2 6.350 323.032 320.492 317.952 10.88 12 8 3.175 2.540 347.345 349.824 12.50 39.688 2 6.350 354.904 14O.D. 8 3.175 2.540 352.364 397.828 14.50 46.038 2 6.350 3.175 8 2.540 405.784 403.244 400.704 16O.D. 448.310 50.800 2 6.350 454.025 451.485 16.00 456.565 18O.D. 8 3.175 2.540 498.792 53.975 2 6.350 502.166 3.175 8 2.540 507.246 504.706 17.00 20O.D. 599.758603.528 608.608 3.175 24O.D. 8 2.540 606.068 19.00 60.325 2 6.350.可参考表中的最右边一列数据选择攻丝前的麻花钻直径注）3.47螺纹收尾长度V outside diameter）的缩写。
美制英制公制螺纹孔尺寸表
”-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”-
1133.249
10.4
1(1/4)"-11
41.91
12.
英制圆锥管螺纹（
美制圆锥管螺纹（NPT）9mJ f牙型角60
1/8
”-27
10.24
43x VYo $g
1/4
13.157
12.907
0.250
11.445
11.890
0.445
3
G3/8-19
16.662
16.412
0.250
14.950
15.395
0.445
4
G1/2-14
20.955
20.671
0.284
18.631
19.172
0.541
5
G3/4-14
26.441
26.157
0.284
24.117
24.658
”-18
13.60
4L8 |v.?J
3/8
”-18
17.04
4.32
1/2
”-14
21.22
4.48
"Lx Hg]')
3/4
”-14
26.57
4.75
GIry h +&a
1”-
11(1/2)
”33.22
4.6qBc!A~8K4'
1(1/4)”-11 国标螺纹的一般知识
英美制标准螺纹尺寸表
最大最小最小1最大最小公差范圍最小最大2A 0.00050.05950.0563…0.05140.04960.00180.04462B 0.04650.05143A 0.00000.06000.0568…0.05190.05060.00130.04513B 0.04650.05142A 0.00060.07240.0686…0.06230.06030.00200.05382B 0.05610.06233A 0.00000.07300.0692…0.06290.06140.00150.05443B 0.05610.06232A 0.00060.07240.0689…0.06340.06150.00190.05592B 0.05800.06353A 0.00000.07300.0695…0.06400.06260.00140.05653B 0.05800.06352A 0.00060.08540.0813…0.07380.07170.00210.06422B 0.06670.07373A 0.00000.08600.0819…0.07440.07280.00160.06483B 0.06670.07372A 0.00060.08540.0816…0.07530.07330.00200.06682B 0.06910.07533A 0.00000.08600.0822…0.07590.07440.00150.06743B 0.06910.07532A 0.00070.09830.0938…0.08480.08250.00230.07342B 0.07640.08453A 0.00000.09900.0945…0.08550.08380.00170.07413B 0.07640.08452A 0.00070.09830.0942…0.08670.08450.00220.07712B 0.07970.08653A 0.00000.09900.0949…0.08740.08580.00160.07783B 0.07970.08652A 0.00080.11120.1061…0.09500.09250.00250.08142B 0.08490.09393A 0.00000.11200.1069…0.09580.09390.00190.08223B 0.08490.09392A 0.00070.11130.1068…0.09780.09540.00240.08642B 0.08940.09683A 0.00000.11200.1075…0.09850.09670.00180.08713B 0.08940.09682A 0.00080.12420.1191…0.10800.10540.00260.09442B 0.09790.10623A 0.00000.12500.1199…0.10880.10690.00190.09523B 0.09790.10622A 0.00070.12430.1195…0.10950.10700.00250.09722B 0.10040.10793A 0.00000.12500.1202…0.11020.10830.00190.09793B 0.10040.10792A 0.00080.13720.1312…0.11690.11410.00280.10002B 0.10400.1143A 0.00000.13800.1320…0.11770.11560.00210.10083B 0.10400.11402A 0.00080.13720.1321…0.12100.11840.00260.10742B 0.1110.1193A 0.00000.13800.1329…0.12180.11980.00200.10823B 0.11100.11862A 0.00090.16310.1571…0.14280.13990.00290.12592B 0.1300.1393A 0.00000.16400.1580…0.14370.14150.00220.12683B 0.13000.13892A 0.00080.16320.1577…0.14520.14240.00280.13012B 0.1340.1423A0.00000.16400.1585…0.14600.14390.00210.13093B0.13400.1416等級允許偏差角最大等級2-56/0.086-562-64/0.086-643-48/0.099-483-56/0.099-560-80/0.060-801-64/0.073-641-72/0.073-726-32/0.138-326-40/0.138-408-32/0.164-328-36/0.164-364-40/0.112-404-48/0.112-485-40/0.125-405-44/0.125-44UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.00100.18900.1818…0.16190.15860.00330.13942B 0.1450.1563A 0.00000.19000.1828…0.16290.16040.00250.14043B 0.14500.15552A 0.00090.18910.1831…0.16880.16580.00300.15192B 0.1560.1643A 0.00000.19000.1840…0.16970.16740.00230.15283B 0.15600.16412A 0.00100.21500.2078…0.18790.18450.00340.16542B 0.1710.1813A 0.00000.21600.2088…0.18890.18630.00260.16643B 0.17100.18072A 0.00100.21500.2085…0.19180.18860.00320.17242B 0.1770.1863A 0.00000.21600.2095…0.19280.19040.00240.17343B 0.17700.18572A 0.00090.21510.2091…0.19480.19170.00310.17792B 0.1820.1903A 0.00000.21600.2100…0.19570.19330.00240.17883B 0.18200.18951A 0.00110.24890.2367…0.21640.21080.00560.18941B 0.1960.2072A 0.00110.24890.24080.23670.21640.21270.00370.18942B 0.1960.2073A 0.00000.25000.2419…0.21750.21470.00280.19053B 0.19600.20671A 0.00100.24900.2392…0.22580.22080.00500.20641B 0.2110.2202A 0.00100.24900.2425…0.22580.22250.00330.20642B 0.2110.2203A 0.00000.25000.2435…0.22680.22430.00250.20743B 0.21100.21902A 0.00100.24900.2430…0.22870.22550.00320.21182B 0.2160.2243A 0.00000.25000.2440…0.22970.22730.00240.21283B 0.21600.22291A 0.00120.31130.2982…0.27520.26910.00610.24521B 0.2520.2652A 0.00120.31130.30260.29820.27520.27120.00400.24522B 0.2520.2653A 0.00000.31250.3038…0.27640.27340.00300.24643B 0.25200.26302A 0.00120.31130.3032…0.27880.27480.00400.25182B 0.2580.2703A 0.00000.31250.3044…0.28000.27700.00300.25303B 0.25800.26801A 0.00110.31140.3006…0.28430.27880.00550.26181B 0.2670.2772A 0.00110.31140.3042…0.28430.28060.00370.26182B 0.2670.2773A 0.00000.31250.3053…0.28540.28270.00270.26293B 0.26700.27542A 0.00100.31150.3050…0.28830.28490.00340.26892B 0.2740.2823A 0.00000.31250.3060…0.28930.28670.00260.26993B 0.27400.28072A 0.00100.31160.3055…0.29120.28800.00320.27432B 0.2790.2863A0.00000.31250.3065…0.29220.28980.00240.27533B0.27900.284712-32/0.216-321/4-20/0.250-201/4-28/0.250-281/4-32/0.250-3210-24/0.190-2410-32/0.190-3212-24/0.216-2412-28/0.216-285/16-32/0.3125-325/16-18/0.3125-185/16-20/0.3125-205/16-24/0.3125-245/16-28/0.3125-28UNC UNF UNC UNF UNC UN UNF UN UNEF UNCUNF UNEF UNEF最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級1A 0.00130.37370.3595…0.33310.32660.00650.29921B 0.3070.3212A 0.00130.37370.36430.35950.33310.32870.00440.29922B 0.3070.3213A 0.00000.37500.3656…0.33440.33110.00330.30053B 0.30700.31822A 0.00120.37380.3657…0.34130.33720.00410.31432B 0.3210.3323A 0.00000.37500.3669…0.34250.33940.00310.31553B 0.32100.32971A 0.00110.37390.3631…0.34680.34110.00570.32431B 0.3300.3402A 0.00110.37390.3667…0.34680.34300.00380.32432B 0.3300.3403A 0.00000.37500.3678…0.34790.34500.00290.32543B 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0.00200.99800.9755…0.91680.90670.01010.84921B 0.8650.8902A 0.00200.99800.98300.97550.91680.91000.00680.84922B 0.8650.8903A 0.0000 1.00000.9850…0.91880.91370.00510.85123B 0.86500.87971A 0.00180.99820.9810…0.94410.93530.00880.89901B 0.9100.9282A 0.00180.99820.9868…0.94410.93820.00590.89902B 0.9100.9283A 0.0000 1.00000.9886…0.94590.94150.00440.90083B 0.91000.91981A 0.00170.99830.9828…0.95190.94350.00840.91321B 0.9230.9382A 0.00170.99830.9880…0.95190.94630.00560.91322B 0.9230.9383A 0.0000 1.00000.9897…0.95360.94940.00420.91493B 0.92300.93162A 0.00150.99850.9891…0.95790.95290.00500.92402B 0.9320.9463A 0.0000 1.00000.9906…0.95940.95570.00370.92553B 0.93200.94082A 0.00140.99860.9905…0.96610.96160.00450.93912B 0.9460.9573A 0.0000 1.00000.9919…0.96750.96410.00340.94053B 0.94600.95372A 0.00120.99880.9923…0.97560.97160.00400.95622B 0.9610.9703A 0.0000 1.00000.9935…0.97680.97380.00300.95743B 0.96100.96762A 0.00110.99890.9929…0.97860.97480.00380.96172B 0.9660.9743A 0.0000 1.00000.9940…0.97970.97690.00280.96283B 0.96600.97192A 0.0020 1.0605 1.0455…0.97930.97250.00680.91172B 0.9270.9523A0.00001.06251.0475…0.98130.97620.00510.91373B0.92700.942215/16-16/0.9375-1615/16-20/0.9375-2015/16-28/0.9375-2815/16-32/0.9375-3215/16-12/0.9375-121-20/1.000-201-28/1.000-281-32/1.000-321-1/16-8/1.0625-81-8/1.000-81-12/1.000-121-14/1.000-141-16/1.000-16UN UNCUNFUNS(5)UN UN UNEF UN UN UNEF UN UN UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.0017 1.0608 1.0494… 1.0067 1.00100.00570.96162B 0.9720.9903A 0.0000 1.0625 1.0511… 1.0084 1.00420.00420.96333B 0.97200.98232A 0.0015 1.0610 1.0516… 1.0204 1.01540.00500.98652B 0.995 1.0093A 0.0000 1.0625 1.0531… 1.0219 1.01820.00370.98803B 0.9950 1.00332A 0.0014 1.0611 1.0524… 1.0250 1.02030.00470.99502B 1.002 1.0153A 0.0000 1.0625 1.0538… 1.0264 1.02280.00360.99643B 1.0020 1.01052A 0.0014 1.0611 1.0530… 1.0286 1.02410.0045 1.00162B 1.008 1.0203A 0.0000 1.0625 1.0544… 1.0300 1.02660.0034 1.00303B 1.0080 1.01622A 0.0012 1.0613 1.0548… 1.0381 1.03410.0040 1.01872B 1.024 1.0323A 0.0000 1.0625 1.0560… 1.0393 1.03630.0030 1.01993B 1.0240 1.03011A 0.0022 1.1228 1.0982… 1.0300 1.0191 1.01090.95271B 0.9700.9982A 0.0022 1.1228 1.1064 1.0982 1.0300 1.02280.00720.95272B 0.9700.9983A 0.0000 1.1250 1.1086… 1.0322 1.02680.00540.95493B 0.97000.98752A 0.0021 1.1229 1.1079 1.1004 1.0417 1.03480.00690.97412B 0.990 1.0153A 0.0000 1.1250 1.1100… 1.0438 1.03860.00520.97623B 0.9900 1.00471A 0.0018 1.1232 1.1060… 1.0691 1.06010.0090 1.02401B 1.035 1.0532A 0.0018 1.1232 1.1118… 1.0691 1.06310.0060 1.02402B 1.035 1.0533A 0.0000 1.1250 1.1136… 1.0709 1.06640.0045 1.02583B 1.0350 1.04482A 0.0015 1.1235 1.1141… 1.0829 1.07790.0050 1.04902B 1.057 1.0713A 0.0000 1.1250 1.1156… 1.0844 1.08070.00370.05053B 1.0570 1.06582A 0.0014 1.1236 1.1149… 1.0875 1.08280.0047 1.05752B 1.065 1.0783A 0.0000 1.1250 1.1163… 1.0889 1.08530.0036 1.05893B 1.0650 1.07302A 0.0014 1.1236 1.1155… 1.0911 1.08660.0045 1.06412B 1.071 1.0823A 0.0000 1.1250 1.1169… 1.0925 1.08910.0034 1.06553B 1.0710 1.07872A 0.0012 1.1238 1.1173… 1.1006 1.09660.0040 1.08122B 1.086 1.0953A 0.0000 1.1250 1.1185… 1.1018 1.09880.0030 1.08243B 1.0860 1.09262A 0.0021 1.1854 1.1704… 1.1042 1.09720.0070 1.03662B 1.052 1.0773A 0.0000 1.1875 1.1725… 1.1063 1.10110.0052 1.03873B 1.0520 1.06722A 0.0017 1.1858 1.1744… 1.1317 1.12590.0058 1.08662B 1.097 1.1153A0.00001.18751.1761…1.13341.12910.0043 1.08833B1.0970 1.10731-1/16-28/1.0625-281-1/8-7/1.125-71-1/8-8/1.125-81-1/8-12/1.125-121-1/16-12/1.0625-121-1/16-16/1.0625-161-1/16-18/1.0625-181-1/16-20/1.0625-201-3/16-8/1.1875-81-3/16-12/1.1875-121-1/8-16/1.125-161-1/8-18/1.125-181-1/8-20/1.125-201-1/8-28/1.125-28UN UN UNEF UN UN UNEF UN UN UN UNC UN UNF UN UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.0015 1.1860 1.1766… 1.1454 1.14030.0051 1.11152B 1.120 1.1343A 0.0000 1.1875 1.1781… 1.1469 1.14310.0038 1.11303B 1.1200 1.12832A 0.0015 1.1860 1.1773… 1.1499 1.14500.0049 1.11992B 1.127 1.1403A 0.0000 1.1875 1.1788… 1.1514 1.14780.0036 1.12143B 1.1270 1.13552A 0.0014 1.1861 1.1780… 1.1536 1.14890.0047 1.12662B 1.133 1.1453A 0.0000 1.1875 1.1794… 1.1550 1.15150.0035 1.12803B 1.1330 1.14122A 0.0012 1.1863 1.1798… 1.1631 1.15900.0041 1.14372B 1.149 1.1573A 0.0000 1.1875 1.1810… 1.1643 1.16120.0031 1.14493B 1.1490 1.15511A 0.0022 1.2478 1.2232… 1.1550 1.14390.0111 1.07771B 1.095 1.1232A 0.0022 1.2478 1.2314 1.2232 1.1550 1.14760.0074 1.07772B 1.095 1.1233A 0.0000 1.2500 1.2336… 1.1572 1.15170.0055 1.07993B 1.0950 1.11252A 0.0021 1.2479 1.2329 1.2254 1.1667 1.15970.0070 1.09912B 1.115 1.1403A 0.0000 1.2500 1.2350… 1.1688 1.16350.0053 1.10123B 1.1150 1.12971A 0.0018 1.2482 1.2310… 1.1941 1.18490.0092 1.14901B 1.160 1.1782A 0.0018 1.2482 1.2368… 1.1941 1.18790.0062 1.14902B 1.160 1.1783A 0.0000 1.2500 1.2386… 1.1959 1.19130.0046 1.15083B 1.1600 1.16982A 0.0015 1.2485 1.2391… 1.2079 1.20280.0051 1.17402B 1.182 1.1963A 0.0000 1.2500 1.2406… 1.2094 1.20560.0038 1.17553B 1.1820 1.19082A 0.0015 1.2485 1.2398… 1.2124 1.20750.0049 1.18242B 1.190 1.2033A 0.0000 1.2500 1.2413… 1.2139 1.21030.0036 1.18393B 1.1900 1.19802A 0.0014 1.2486 1.2405… 1.2161 1.21140.0047 1.18912B 1.196 1.2073A 0.0000 1.2500 1.2419… 1.2175 1.21400.0035 1.19053B 1.1960 1.20372A 0.0012 1.2488 1.2423… 1.2256 1.22150.0041 1.20622B 1.211 1.2203A 0.0000 1.2500 1.2435… 1.2268 1.22370.0031 1.20743B 1.2110 1.21762A 0.0021 1.3104 1.2954… 1.2292 1.22210.0071 1.16162B 1.177 1.2023A 0.0000 1.3125 1.2975… 1.2313 1.22600.0053 1.16373B 1.1770 1.19222A 0.0017 1.3108 1.2994… 1.2567 1.25090.0058 1.21162B 1.222 1.2403A 0.0000 1.3125 1.3011… 1.2584 1.25410.0043 1.21333B 1.2220 1.23232A 0.0015 1.3110 1.3016… 1.2704 1.26530.0051 1.23652B 1.245 1.2593A0.00001.31251.3031…1.27191.26810.0038 1.23803B1.2450 1.25331-3/16-16/1.1875-161-3/16-18/1.1875-181-1/4-12/1.250-121-1/4-16/1.250-161-1/4-18/1.250-181-1/4-20/1.250-201-3/16-20/1.1875-201-3/16-28/1.1875-281-1/4-7/1.250-71-1/4-8/1.250-81-1/4-28/1.250-281-5/16-8/1.3125-81-5/16-12/1.3125-121-5/16-16/1.3125-16UN UN UNC UN UN UNEF UN UN UN UNUNF UN UNEF UN最大最小最小1最大最小公差范圍最小最大等級允許偏差角最大等級2A 0.0015 1.3110 1.3023… 1.2749 1.27000.0049 1.24492B 1.252 1.2653A 0.0000 1.3125 1.3038… 1.2764 1.27280.0036 1.24643B 1.2520 1.26052A 0.0014 1.3111 1.3030… 1.2786 1.27390.0047 1.25162B 1.258 1.2703A 0.0000 1.3125 1.3044… 1.2800 1.27650.0035 1.25303B 1.2580 1.26622A 0.0012 1.3113 1.3048… 1.2881 1.28400.0041 1.26872B 1.274 1.2823A 0.0000 1.3125 1.3060… 1.2893 1.28620.0031 1.26993B 1.2740 1.28011A 0.0024 1.3726 1.3453… 1.2643 1.25230.0120 1.17421B 1.195 1.2252A 0.0024 1.3726 1.3544 1.3453 1.2643 1.25630.0080 1.17422B 1.195 1.2253A 0.0000 1.3750 1.3568… 1.2667 1.26070.0060 1.17663B 1.1950 1.21462A 0.0022 1.3728 1.3578 1.3503 1.2916 1.28440.0072 1.22402B 1.240 1.2653A 0.0000 1.3750 1.3600… 1.2938 1.28840.0054 1.22623B 1.2400 1.25471A 0.0019 1.3731 1.3559… 1.3190 1.30960.0094 1.27391B 1.285 1.3032A 0.0019 1.3731 1.3617… 1.3190 1.31270.0063 1.27392B 1.285 1.3033A 0.0000 1.3750 1.3636… 1.3209 1.31620.0047 1.27583B 1.2850 1.29482A 0.0015 1.3735 1.3641… 1.3329 1.32780.0051 1.29902B 1.307 1.3213A 0.0000 1.3750 1.3656… 1.3344 1.33060.0038 1.30053B 1.3070 1.31582A 0.0015 1.3735 1.3648… 1.3374 1.33250.0049 1.30742B 1.315 1.3283A 0.0000 1.3750 1.3663… 1.3389 1.33530.0036 1.30893B 1.3150 1.32302A 0.0014 1.3736 1.3655… 1.3411 1.33640.0047 1.31412B 1.321 1.3323A 0.0000 1.3750 1.3669… 1.3425 1.33900.0035 1.31553B 1.3210 1.32872A 0.0012 1.3738 1.3673… 1.3506 1.34650.0041 1.33122B 1.336 1.3453A 0.0000 1.3750 1.3685… 1.3518 1.34870.0031 1.33243B 1.3360 1.34262A 0.0024 1.4351 1.4169… 1.3268 1.31880.0080 1.23672B 1.257 1.2883A 0.0000 1.4375 1.4193… 1.3292 1.32320.0060 1.23913B 1.2570 1.27712A 0.0022 1.4353 1.4203… 1.3541 1.34690.0072 1.28652B 1.302 1.3273A 0.0000 1.4375 1.4225… 1.3563 1.35090.0054 1.28873B 1.3020 1.31722A 0.0018 1.4357 1.4243… 1.3816 1.37570.0059 1.33652B 1.347 1.3653A 0.0000 1.4375 1.4261… 1.3834 1.37900.0044 1.33833B 1.3470 1.35732A 0.0016 1.4359 1.4265… 1.3953 1.39010.0052 1.36142B 1.370 1.3843A0.00001.43751.4281…1.39691.39300.0039 1.36303B1.3700 1.37831-5/16-18/1.3125-181-5/16-20/1.3125-201-5/16-28/1.3125-281-3/8-6/1.375-61-3/8-20/1.375-201-3/8-28/1.375-281-7/16-6/1.4375-61-7/16-8/1.4375-81-3/8-8/1.375-81-3/8-12/1.375-121-3/8-16/1.375-161-3/8-18/1.375-181-7/16-12/1.4375-121-7/16-16/1.4375-16UN UNF UN UNEF UNEF UN UN UNC UNUN UN UN UN UN最大最小最小1最大最小公差范圍最小最大外螺紋内螺紋外 徑中 徑孔 徑等級允許偏差外徑倒角最大等級螺紋规格螺紋型式2A 0.0015 1.4360 1.4273… 1.3999 1.39490.0050 1.36992B 1.377 1.3903A 0.0000 1.4375 1.4288… 1.4014 1.39770.0037 1.37143B 1.3770 1.38552A 0.0014 1.4361 1.4280… 1.4036 1.39880.0048 1.37662B 1.383 1.3953A 0.0000 1.4375 1.4294… 1.4050 1.40140.0036 1.37803B 1.3830 1.39122A 0.0013 1.4362 1.4297… 1.4130 1.40880.0042 1.39362B 1.399 1.4073A 0.0000 1.4375 1.4310… 1.4143 1.41120.0031 1.39493B 1.3990 1.40511A 0.0024 1.4976 1.4703… 1.3893 1.37720.0121 1.29921B 1.320 1.3502A 0.0024 1.4976 1.4794 1.4703 1.3893 1.38120.0081 1.29922B 1.320 1.3503A 0.0000 1.5000 1.4818… 1.3917 1.38560.0061 1.30163B 1.3200 1.33962A 0.0022 1.4978 1.4828 1.4753 1.4166 1.40930.0073 1.34902B 1.365 1.3903A 0.0000 1.5000 1.4850… 1.4188 1.41330.0055 1.35123B 1.3650 1.37971A 0.0019 1.4981 1.4809… 1.4440 1.43440.0096 1.39891B 1.410 1.4282A 0.0019 1.4981 1.4867… 1.4440 1.43760.0064 1.39892B 1.410 1.4283A 0.0000 1.5000 1.4886… 1.4459 1.44110.0048 1.40083B 1.4100 1.41982A 0.0016 1.4984 1.4890… 1.4578 1.45260.0052 1.42392B 1.432 1.4463A 0.0000 1.5000 1.4906… 1.4594 1.45550.0039 1.42553B 1.4320 1.44082A 0.0015 1.4985 1.4898… 1.4624 1.45740.0050 1.43242B 1.440 1.4523A 0.0000 1.5000 1.4913… 1.4639 1.46020.0037 1.43393B 1.4400 1.44802A 0.0014 1.4986 1.4905… 1.4661 1.46130.0048 1.43912B 1.446 1.4573A 0.0000 1.5000 1.4919… 1.4675 1.46390.0036 1.44053B 1.4460 1.45372A 0.0013 1.4987 1.4922… 1.4755 1.47130.0042 1.45612B 1.461 1.4703A0.00001.50001.4935…1.47681.47370.0031 1.45743B1.4610 1.46761-1/2-20/1.500-201-1/2-28/1.500-281-7/16-28/1.4375-281-1/2-6/1.500-61-1/2-8/1.500-81-1/2-12/1.500-121-1/2-16/1.500-161-1/2-18/1.500-181-7/16-18/1.4375-181-7/16-20/1.4375-20UNEF UN UN UNEF UN UNUN UNC UN UNF角最小最小最大公差范圍0.05190.05420.00230.0600 0.05190.05360.00170.0600 0.06290.06550.00260.0730 0.06290.06480.00190.0730 0.06400.06650.00250.0730 0.06400.06590.00190.0730 0.07440.07720.00280.0860 0.07440.07650.00210.0860 0.07590.07860.00270.0860 0.07590.07790.00200.0860 0.08550.08850.00300.0990 0.08550.08770.00220.0990 0.08740.09020.00280.0990 0.08740.08950.00210.0990 0.09580.09910.00330.1120 0.09580.09820.00240.1120 0.09850.10160.00310.1120 0.09850.10080.00230.1120 0.10880.11210.00330.1250 0.10880.11130.00250.1250 0.11020.11340.00320.1250 0.11020.11260.00240.1250 0.11770.12140.00370.1380 0.11770.12040.00270.1380 0.12180.12520.00340.1380 0.12180.12430.00250.1380 0.14370.14750.00380.1640 0.14370.14650.00280.1640 0.14600.14960.00360.1640 0.14600.14870.00270.1640最小最大公差范圍角最小0.16290.16720.00430.1900 0.16290.16610.00320.1900 0.16970.17360.00390.1900 0.16970.17260.00290.1900 0.18890.19330.00440.2160 0.18890.19220.00330.2160 0.19280.19700.00420.2160 0.19280.19590.00310.2160 0.19570.19980.00410.2160 0.19570.19880.00310.2160 0.21750.22480.00730.2500 0.21750.22240.00490.2500 0.21750.22110.00360.2500 0.22680.23330.00650.2500 0.22680.23110.00430.2500 0.22680.23000.00320.2500 0.22970.23390.00420.2500 0.22970.23280.00310.2500 0.27640.28430.00790.3125 0.27640.28170.00530.3125 0.27640.28030.00390.3125 0.28000.28520.00570.3125 0.28000.28390.00390.3125 0.28540.29250.00710.3125 0.28540.29020.00480.3125 0.28540.28900.00360.3125 0.28930.29370.00440.3125 0.28930.29260.00330.3125 0.29220.29640.00420.3125 0.29220.29530.00310.3125最小最大公差范圍角最小0.33440.34290.00850.3750 0.33440.34010.00570.3750 0.33440.33870.00430.3750 0.34250.34790.00540.3750 0.34250.34650.00400.3750 0.34790.35530.00740.3750 0.34790.35280.00490.3750 0.34790.35160.00370.3750 0.35180.35640.00460.3750 0.35180.35530.00350.3750 0.35470.35910.00440.3750 0.35470.35800.00330.3750 0.39110.40030.00920.4375 0.39110.39720.00610.4375 0.39110.39570.00460.4375 0.39690.40280.00590.4375 0.39690.40140.00450.4375 0.40500.41310.00810.4375 0.40500.41040.00540.4375 0.40500.40910.00410.4375 0.41430.41890.00460.4375 0.41430.41780.00350.4375 0.41720.42160.00440.4375 0.41720.42050.00330.4375 0.45000.45970.00970.5000 0.45000.45650.00650.5000 0.45000.45480.00480.5000 0.45940.46550.00610.5000 0.45940.46400.00460.5000 0.46750.47590.00840.5000 0.46750.47310.00560.5000 0.46750.47170.00420.5000最小最大公差范圍角最小0.47680.48160.00480.5000 0.47680.48040.00360.5000 0.47970.48420.00450.5000 0.47970.48310.00340.5000 0.50840.51860.01020.5625 0.50840.51520.00680.5625 0.50840.51350.00510.5625 0.52190.52800.00610.5625 0.52190.52650.00460.5625 0.52640.53530.00890.5625 0.52640.53230.00590.5625 0.52640.53080.00440.5625 0.53000.53550.00550.5625 0.53000.53410.00410.5625 0.53540.54050.00510.5625 0.53540.53920.00380.5625 0.53930.54410.00480.5625 0.53930.54290.00360.5625 0.54220.54670.00450.5625 0.54220.54560.00340.5625 0.56600.57670.01070.6250 0.56600.57320.00720.6250 0.56600.57140.00540.6250 0.57090.57800.00710.6250 0.57090.57620.00530.6250 0.58440.59060.00620.6250 0.58440.58900.00460.6250 0.58890.59800.00910.6250 0.58890.59490.00600.6250 0.58890.59340.00450.6250最小最大公差范圍角最小0.59250.59810.00560.6250 0.59250.59670.00420.6250 0.59790.60310.00520.6250 0.59790.60180.00390.6250 0.60180.60670.00490.6250 0.60180.60550.00370.6250 0.60470.60930.00460.6250 0.60470.60820.00350.6250 0.63340.64050.00710.6875 0.63340.63870.00530.6875 0.64690.65310.00620.6875 0.64690.65150.00460.6875 0.65500.66060.00560.6875 0.65500.65920.00420.6875 0.66040.66560.00520.6875 0.66040.66430.00390.6875 0.66430.66920.00490.6875 0.66430.66800.00370.6875 0.66720.67180.00460.6875 0.66720.67070.00350.6875 0.68500.69650.01150.7500 0.68500.69270.00770.7500 0.68500.69070.00570.7500 0.69590.70310.00720.7500 0.69590.70130.00540.7500 0.70940.71920.00980.7500 0.70940.71590.00650.7500 0.70940.71430.00490.7500 0.71750.72320.00570.7500 0.71750.72180.00430.7500最小最大公差范圍角最小0.72680.73180.00500.7500 0.72680.73050.00370.7500 0.72970.73440.00470.7500 0.72970.73330.00360.7500 0.75840.76560.00720.8125 0.75840.76380.00540.8125 0.77190.77820.00630.8125 0.77190.77660.00470.8125 0.78000.78570.00570.8125 0.78000.78430.00430.8125 0.78930.79430.00500.8125 0.78930.79300.00370.8125 0.79220.79690.00470.8125 0.79220.79580.00360.8125 0.80280.81510.01230.8750 0.80280.81100.00820.8750 0.80280.80890.00610.8750 0.82090.82810.00720.8750 0.82090.82630.00540.8750 0.82860.83920.01060.8750 0.82860.83560.00700.8750 0.82860.83390.00530.8750 0.83440.84070.00630.8750 0.83440.83910.00470.8750 0.84250.84820.00570.8750 0.84250.84680.00430.8750 0.85180.85680.00500.8750 0.85180.85550.00370.8750 0.85470.85940.00470.8750 0.85470.85830.00360.8750。
美国标准管螺纹
美国标准管螺纹一. 标准：ANSI B1.20.1美国标准管螺纹。
美国标准管螺纹不仅用于压力较低的水、煤气管道，也同时用于高温、高压系统。
就管螺纹而言，目前在世界范围内形成了以ISO标准为一方，以美国标准为另一方的两大管螺纹标准体系。
二. 螺纹类型1. 基本牙型：牙型角60°。
锥度1：16。
牙型为平顶平底。
2. 基本类型NPT 一般用途的美国标准锥管螺纹NPSC 管接头用美国标准直管螺纹NPTR 导杆连接用美国标准锥管螺纹NPSM 设备上的自由配合机械连接用美国标准直管螺纹NPSL 锁紧螺母的松配合机械连接用美国标准直管螺纹另有薄壁管上采用的UNS——薄壁管用特殊统一螺纹三. 一般用途的锥管螺纹NPT1. 标记：3/8-18NPT。
2. 基本中径和基准距离：锥管螺纹的基本中径是根据管子外径、螺距和手旋合长度确定的，内外螺纹之间用手旋合的公称长度为基准距离，内螺纹的基面为螺纹大端处截面（该截面上的螺纹中径为基本中径），外螺纹基面在离小端距离为基准距离处。
3. 常用螺纹尺寸四. 管接头用直管内螺纹NPSF1. 该螺纹与标准锥管螺纹装配时，能形成耐压密封连接，但只在压力较低的情况下才采用。
2. 标记示例：1/8-27NPSF3. 常用螺纹尺寸五. 导杆连接用锥管螺纹NPTR1. NPTR螺纹的牙型与标准锥管螺纹是一样的。
导杆连接要求用内、外锥螺纹形成一个刚性的机械螺纹连接。
2. 标记示例：1/2-14NPTR3. 常用螺纹尺寸六. 机械连接用直管螺纹NPSM、NPSL1. 设备上自由配合的机械连接，内、外螺纹均采用NPSM螺纹；带锁紧螺母的松配合机械连接，内、外螺纹均采用NPSL螺纹。
2. 标记示例：1/8-27NPSM1/8-27NPSL3. 常用螺纹尺寸七. 薄壁管用特殊统一螺纹UNS1. 对一般用途的薄壁管，推荐采用27牙系列、1/4至1英寸的特殊统一螺纹UNS，螺纹等级为2A和2B级。