|
美 制 细 螺 纹
|
|
规格(UNF)
|
标准径
|
2级牙钻孔径
|
|
最大
|
最小
|
|
番数牙外径
|
|
|
|
|
NO.0-80(1.524)
|
1.25
|
1.305
|
1.182
|
|
NO.1-72(1.854)
|
1.55
|
1.612
|
1.474
|
|
NO.2-64(2.184)
|
1.85
|
1.912
|
1.756
|
|
NO.3-56(2.515)
|
2.10
|
2.197
|
2.025
|
|
NO.4-48(2.845)
|
2.40
|
2.458
|
2.271
|
|
NO.5-44(3.175)
|
2.70
|
2.740
|
2.551
|
|
NO.6-40(3.505)
|
2.90
|
3.022
|
2.820
|
|
NO.8-36(4.166)
|
3.50
|
3.606
|
3.404
|
|
NO.10-32(4.826)
|
4.10
|
4.165
|
3.963
|
|
NO.12-28(5.846)
|
4.60
|
4.724
|
4.496
|
|
1/4 -28
|
5.50
|
5.588
|
5.360
|
|
5/16 -24
|
6.90
|
7.035
|
6.782
|
|
3/8 -24
|
8.50
|
8.636
|
8.382
|
|
7/16 -20
|
9.90
|
10.033
|
9.729
|
|
1/2 -20
|
11.50
|
11.607
|
11.329
|
|
9/16 -18
|
12.90
|
13.081
|
12.751
|
|
5/8 -18
|
14.50
|
14.681
|
14.351
|
|
3/4 -16
|
17.50
|
14.678
|
17.323
|
|
7/8 -14
|
20.50
|
20.675
|
20.270
|
|
1 -12
|
23.20
|
23.571
|
23.114
|
|
1-1/8 -12
|
26.50
|
26.746
|
26.289
|
|
1-1/4 -12
|
29.50
|
29.921
|
29.464
|
|
1-3/8 -12
|
32.80
|
33.096
|
32.464
|
|
1-1/2 -12
|
36.00
|
36.270
|
35.814
|
|
