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GB /T 34632 - 2017 The blank diameters for rolling unified screw threads

螺纹
0# 1# 1# 2# 2# 3# 3 4 4 5 5 6 6 8
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
80 64 72 56 64 48 56 40 48 40 44 32 40 32
UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC UNF UNC
1.312 1.593 1.619 1.886 1.921 2.167 2.213 2.433 2.496 2.761 2.793 2.993 3.089 3.647
1.301 1.579 1.606 1.87 1.907 2.152 2.198 2.413 2.478 2.742 2.774 2.972 3.068 3.626
1.297 1.575 1.601 1.868 1.903 2.147 2.193 2.41 2.476 2.738 2.773 2.969 3.066 3.62
1.278 1.553 1.581 1.845 1.882 2.122 2.168 2.381 2.448 2.706 2.744 2.938 3.035 3.589
螺纹
8 10 10 12 12 12 1/4 1/4 1/4 5/16 5/16 5/16 3/8 3/8
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
36 24 32 24 28 32 20 28 32 18 24 32 16 24
UNF UNC UNF UNC UNF UNEF UNC UNF UNEF UNC UNF UNEF UNC UNF
3.703 4.143 4.304 4.8 4.892 4.963 5.53 5.749 5.821 7.026 7.239 7.406 8.492 8.82
3.681 4.12 4.281 4.774 4.869 4.937 5,503 5.727 5.799 6.995 7.214 7.381 8.463 8.794
3.68 4.114 4.278 4.771 4.863 4.934 5.499 5.719 5,792 6.991 7.207 7.377 8.456 8.789
3.645 4.078 4.244 4.732 4.827 4.895 5.457 5.685 5.757 6.943 7.165 7.339 8,406 8.747
螺纹
3/8 7/16 7/16 7/16 7/16 1/2 1/2 1/2 1/2 9/16 9/16 9/16 9/16 5/8
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
32 14 16 20 28 13 16 20 28 12 16 18 24 11
UNEF UNC UN UNF UNEF UNC UN UNF UNEF UNC UN UNF UNEF UNC
8.99 9.936 10.075 10.276 10.501 11.436 11.659 11.861 12.088 12.901 13.239 13.354 13.574 14.366
8.967 9.904 10.041 10.245 10.478 11.397 11.625 11.827 12.062 12.879 13.21 13.321 13.549 14.342
8.961 9.897 10.036 10.239 10.47 11.394 11.62 11.825 12.056 12.856 13.199 13.315 13.54 14.319
8.923 9.842 9.981 10.188 10.431 11.33 11.563 11.77 12.015 12.81 13.148 13.262 13.497 14.267
螺纹
5/8 5/8 5/8 5/8 3/4 3/4 3/4 3/4 7/8 7/8 7/8 7/8 7/8 1
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
12 16 18 24 10 12 16 20 9 12 14 16 20 8
UN UN UNF UNEF UNC UN UNF UNEF UNC UN UNF UN UNEF UNC
14.494 14.824 14.94 15.161 17.389 17.664 17.996 18.202 20.379 20.828 21.02 21.164 21.372 23.33
14.458 14.793 14.905 15.136 17.359 17.627 17.96 18.17 20.348 20.796 20.984 21.135 21.341 23.294
14.45 14.785 14.901 15.126 17.339 17.617 17.954 18.165 20.327 20.781 20.976 21.122 21.335 23.275
14.388 14.731 14.842 15.084 17.279 17.553 17.895 18.113 20.263 20.721 20.914 21.07 21.284 23.207
螺纹
1 1 1 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-3/8
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
12 16 20 7 8 12 16 18 7 8 12 16 18 6
UNF UN UNEF UNC UN UNF UN UNEF UNC UN UNF UN UNEF UNC
24.00 24.337 24.546 26.233 26.500 27.173 27.511 27.63 29.379 29.661 30.343 30.682 30.802 32.176
23.963 24.309 24.515 26.179 26.461 27.133 27.48 27.596 29.346 29.629 30.304 30.654 30.77 32.132
23.951 24.295 24.506 26.172 26.442 27.124 27.469 27.59 29.318 29.603 30.294 30.640 30.76 32.11
23.883 24.241 24.455 26.083 26.369 27.053 27.415 27.534 29.247 29.538 30.221 30.587 30.703 32.025
螺纹
1-3/8 1-3/8 1-3/8 1-3/8 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 1-5/8 1-5/8 1-5/8 1-5/8 1-3/4
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
8 12 16 18 6 8 12 16 18 8 12 16 18 8
UN UNF UN UNEF UNC UN UNF UN UNEF UN UN UN UNEF UN
32.833 33.517 33.856 33.976 35.346 36.005 36.691 37.031 37.151 39.17 39.86 40.201 40.3ZZ 42.343
32.798 33.475 33.826 33.942 35.299 35.968 36.646 37.000 37.116 39.139 39.832 40.176 40.29 42.31
32.772 33.465 33.814 33.934 35.28 35.944 36.638 36.986 37.109 39.108 39.809 40.155 40.279 42.279
32.702 33.39 33.758 33.877 35.193 35.872 36.561 36.93 37.049 39.044 39.753 40.104 40.226 42.212
螺纹
1-3/4 1-3/4 1-7/8 1-7/8 1-7/8 2 2 2
牙数
螺纹系列代号
材料 3A 最大值
最小值
2A 最大值
最小值
12 16 8 12 16 8 12 16
UN UN UN UN UN UN UN UN
43.034 43.376 45.517 46.209 46.55 48.69 49.383 49.725
43.003 43.348 45.483 46.178 46.522 48.654 49.352 49.697
42.983 43.33 45.452 46.158 46.505 48.626 49.332 49.679
42.925 43.279 45.38 46.099 46.454 48.552 49.271 49.626
① 计算3A螺纹毛坯直径时,螺纹环规通、止端中径的内缩量减半。

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