55°英制非密封管螺纹的基本尺寸及其极限偏差
螺纹尺寸代号 牙数n 螺距P 牙高h 基本直径 中径公差 小径公差 大径公差
大径d=D 中径d2=D2 小径d1=D1 内螺纹 外螺纹 内螺纹 外螺纹
下偏差 上偏差 下偏差 上偏差 下偏差 上偏差 下偏差 上偏差
A级 B级
1/16 28 0.907 0.581 7.723 7.142 6.561 0 +0.107 -0.107 -0.214 0 0 +0.282 -0.214 0
1/8 28 0.907 0.581 9.728 9.147 8.566 0 +0.107 -0.107 -0.214 0 0 +0.282 -0.214 0
1/4 19 1.337 0.856 13.157 12.301 11.445 0 +0.125 -0.125 -0.250 0 0 +0.445 -0.250 0
3/8 19 1.337 0.856 16.662 15.806 14.950 0 +0.125 -0.125 -0.250 0 0 +0.445 -0.250 0
1/2 14 1.814 1.162 20.995 19.833 18.672 0 +0.142 -0.142 -0.284 0 0 +0.541 -0.284 0
5/8 14 1.814 1.162 22.911 21.749 20.588 0 +0.142 -0.142 -0.284 0 0 +0.541 -0.284 0
3/4 14 1.814 1.162 26.441 25.279 24.118 0 +0.142 -0.142 -0.284 0 0 +0.541 -0.284 0
7/8 14 1.814 1.162 30.201 29.039 27.878 0 +0.142 -0.142 -0.284 0 0 +0.541 -0.284 0
1 11 2.309 1.479 33.249 31.770 30.292 0 +0.180 -0.180 -0.360 0 0 +0.640 -0.360 0
1 1/8 11 2.309 1.479 37.897 36.418 34.940 0 +0.180 -0.180 -0.360 0 0 +0.640 -0.360 0
1 1/4 11 2.309 1.479 41.910 40.431 38.953 0 +0.180 -0.180 -0.360 0 0 +0.640 -0.360 0
1 1/2 11 2.309 1.479 47.803 46.324 44.846 0 +0.180 -0.180 -0.360 0 0 +0.640 -0.360 0
1 3/4 11 2.309 1.479 53.746 52.267 50.789 0 +0.180 -0.180 -0.360 0 0 +0.640 -0.360 0
2 11 2.309 1.479 59.614 58.135 56.657 0 +0.180 -0.180 -0.360 0 0 +0.640 -0.360 0
2 1/4 11 2.309 1.479 65.710 64.231 62.753 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
2 1/2 11 2.309 1.479 75.184 73.705 72.227 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
2 3/4 11 2.309 1.479 81.534 80.055 78.577 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
3 11 2.309 1.479 87.884 86.405 84.927 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
3 1/2 11 2.309 1.479 100.330 98.851 97.373 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
4 11 2.309 1.479 113.030 111.551 110.073 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
4 1/2 11 2.309 1.479 125.730 124.251 122.773 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
5 11 2.309 1.479 138.430 136.951 135.473 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
5 1/2 11 2.309 1.479 151.130 149.651 148.173 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0
6 11 2.309 1.479 163.830 162.351 160.873 0 +0.217 -0.217 -0.434 0 0 +0.640 -0.434 0