美制螺纹底孔直径表

4.826 5.690 7.264 8.865 10.338 11.938 13.386 14.986 17.958 21.133 24.308
4.623 5.486 7.087 8.661 10.135 11.709 13.132 14.732 17.678 20.853 24.028
美制管螺纹
钻孔径
8.382 9.729
11.607 13.081
11.329 12.751
14.681
14.351
17.678 20.675
17.323 20.270
23.571 26.746
23.114 26.289
29.921
29.464
33.096 36.271
32.639 35.814
规格 （UNEF)
NO.12-32 1/4--32 5/16-32 3/8-32 7/16-28 1/2-28 9/16-24 5/8-24 3/4-20 7/8-20
英制电器螺纹
规格 2BA 3BA 4BA 5BA 6BA
钻孔径 4.0-4.2
3.0-3.2 2.7-2.8 2.4-2.5
美制迫牙丝攻钻孔径
精度等级
G4-G6
G7-G8
G9
1.94 2.23 2.50 2.83 3.07 3.73 4.24 4.90
-
1.97 2.27 2.56 2.86 3.16 3.78 4.39 4.99 5.85 7.36
-
3.77 4.30 4.96 5.72 7.24 8.74 10.20 11.27 4.43 5.04 5.90 7.41 9.00 10.48 12.07
9.144 10.592
12.446 13.386
11.989 12.868
18.840
16.307
19.761 22.606
19.177 21.971
25.349 28.524
24.638 27.813
31.115
30.353
34.290 39.827
33.528 38.964
45.593
44.679
1-8 1-1/8-7 1-1/4-7 1-3/8-6 1-1/2-6 1-3/4-5 2-4-1/2
规格
NO.2-56UNC NO.3-48 NO.4-40 NO.5-40 NO.6-32 NO.8-32 NO.10-24 NO.12-24 1/4-20 5/16-18 3/8-16 7/16-14 1/2-13
8.81 10.30 11.82 10.54 12.13
规格 （UNF)
NO.0-80(1.524) NO.1-72(1.854) NO.2-64(2.184) NO.3-56(2.515) NO.4-48(2.845) NO.5-44(3.175) NO.6-40(3.505) NO.8-36(4.166) NO.10-32(4.826) NO.12-28(5.846)
2级牙钻孔径
最大
最小
1.582
1.425
1.871
1.695
2.146 2.385
1.941 2.157
2.697 2.895
2.487 2.642
3.530
3.302
3.962 4.597
3.683 4.344
5.257 6.731
4.979 6.401
8.153
7.798
9.550 11.023
1-20
规格
1/16-27 1/8-27 1/4-18 3/8-18 1/2-14 3/4-14 1-11-1/2 1-1/4-11-1/2 1-1/2-11-1/2 2-11-1/2
美制特细螺纹
标准径
2级牙钻孔径
最大
最小
4.70 5.60 7.10 8.70 10.20 11.80 13.20 14.80 17.80 21.00 24.00
NPT
使用绞刀时 不用绞刀时
6.10
6.25
8.33
8.Байду номын сангаас3
10.72
11.13
14.27
14.27
17.48
17.86
22.63
23.01
28.58
28.98
37.31
37.69
43.66
44.04
55.58
55.96
NPS
6.35 8.74 11.13 14.68 18.26 23.42 29.36 38.10 44.45 56.36
1/4-28 5/16-24 3/8-24 7/16-20 1/2-20 9/16-18 5/8-18 3/4-16 7/8-14
1-12 1-1/8-12 1-1/4-12 1-3/8-12 1-1/2-12
美制细螺纹
标准径
1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 17.50 20.50 23.20 26.50 29.50 32.80 36.0
2级牙钻孔径
最大
最小
1.305
1.182
1.612
1.474
1.912 2.197
1.756 2.025
2.458 2.740
2.271 2.551
3.022
2.820
3.606 4.165
3.404 3.963
4.724 5.588
4.496 5.360
7.035
6.782
8.636 10.033
规格 （UNC) NO.1-64(1.854) NO.2-56(2.184) NO.3-48(2.515) NO.4-40(2.845) NO.5-40(3.175) NO.6-32(3.505) NO.8-32(4.166) NO.10-24(4.826) NO.12-24(5.486) 1/4 -20 5/16 -18 3/8 -16 7/16 -14 1/2 -13 9/16 -12 5/8 -11 3/4 -10 7/8 -9
NO.2-64UNF NO.3-56 NO.4-48 NO.5-44 NO.6-40 NO.8-36 NO.10-32 NO.12-28 1/4-28 5/16-24 3/8-24 7/16-20 1/2-20
美制粗螺纹
标准径
1.55 1.80 2.10 2.30 2.60 2.80 3.40 3.90 4.50 5.10 6.60 8.00 9.40 10.80 12.20 13.60 16.50 19.50 22.20 25.00 28.20 30.80 34.00 39.50 45.20