|
美 制 管 螺 纹
|
|
|
规格(UNEF)
|
标准径
|
2级牙钻孔径
|
|
|
最大
|
最小
|
|
|
NO.12 -32
|
4.70
|
4.826
|
4.623
|
|
|
1/4 -32
|
5.60
|
5.690
|
5.486
|
|
|
5/16 -32
|
7.10
|
7.264
|
7.087
|
|
|
3/8 -32
|
8.70
|
8.865
|
8.661
|
|
|
7/16 -28
|
10.20
|
10.338
|
10.135
|
|
|
1/2 -28
|
11.80
|
11.938
|
11.709
|
|
|
9/16 -28
|
13.20
|
13.386
|
13.132
|
|
|
5/8 -24
|
14.80
|
14.986
|
14.732
|
|
|
3/4 -20
|
17.80
|
17.958
|
17.678
|
|
|
7/8 -20
|
21.00
|
21.133
|
20.853
|
|
|
1 -20
|
24.00
|
24.308
|
24.028
|
|
|
|
|
|
美 制 粗 螺 纹
|
|
|
规格(UNC)
|
标准径
|
2级牙钻孔径
|
|
|
番数牙外径
|
最大
|
最小
|
|
|
NO.1-64(1.854)
|
1.55
|
1.582
|
1.425
|
|
|
NO.2-56(2.184)
|
1.80
|
1.871
|
1.695
|
|
|
NO.3-48(2.515)
|
2.10
|
2.146
|
1.941
|
|
|
NO.4-40(2.845)
|
2.30
|
2.385
|
2.157
|
|
|
NO.5-40(3.175)
|
2.60
|
2.697
|
2.487
|
|
|
NO.6-32(3.505)
|
2.80
|
2.895
|
2.642
|
|
|
NO.8-32(4.166)
|
3.40
|
3.530
|
3.302
|
|
|
NO.10-24(4.826)
|
3.90
|
3.962
|
3.682
|
|
|
NO.12-24(5.846)
|
4.50
|
4.597
|
4.344
|
|
|
1/4 -20
|
5.10
|
5.257
|
4.979
|
|
|
5/16 -18
|
6.60
|
6.731
|
6.401
|
|
|
3/8 -16
|
8.00
|
8.153
|
7.987
|
|
|
7/16 -14
|
9.40
|
9.500
|
9.144
|
|
|
1/2 -13
|
10.80
|
11.023
|
10.592
|
|
|
9/16 -12
|
12.20
|
12.446
|
11.989
|
|
|
5/8 -11
|
13.60
|
12.868
|
13.386
|
|
|
3/4 -10
|
16.20
|
16.840
|
16.307
|
|
|
7/8 -9
|
19.50
|
19.761
|
19.177
|
|
|
1 -8
|
22.20
|
22.606
|
21.971
|
|
|
1-1/8 -7
|
25.00
|
25.349
|
24.638
|
|
|
1-1/4 -7
|
28.20
|
28.524
|
27.813
|
|
|
1-3/8 -6
|
30.80
|
31.115
|
30.353
|
|
|
1-1/2 -6
|
34.00
|
34.290
|
33.528
|
|
|
1-3/4 -5
|
39.50
|
39.827
|
38.964
|
|
|
2 -4-1/2
|
45.20
|
45.593
|
44.679
|
|
|
