絲攻加工下孔徑選用表

梅華
UNC美制粗牙螺紋
螺紋尺寸
牙數
建議孔徑
最小尺寸
最大尺寸
NO.1

64
1.55
1.425
1.582
NO.2
56
1.8
1.695
1.871
NO.3
48
2.1
1.941
2.146
NO.4
40
2.3
2.157
2.385
NO.5
40
2.6
2.487
2.697
NO.6
32
2.8
2.642
2.895
NO.8
32
3.4
3.302
3.530
NO.10
24
3.9
3.683
3.962
NO.12
24
4.5
4.344
4.597
1/4
20
5.1
4.979
5.257
5/16
18
6.6
6.401
6.731
3/8
16
8
7.798
8.153
7/16
14
9.4
9.144
9.550
1/2
13
10.8
10.592
11.023
9/16
12
12.2
11.989
12.446
5/8
11
13.6
13.386
13.868
3/4
10
16.5
16.307
16.840
7/8
9
19.5
19.177
19.761
1
8
22.2
21.971
22.606
1 1/8
7
25
24.638
25.349
1 1/4
7
28.2
27.813
28.524
1 3/8
6
30.8
30.353
31.115
1 1/2
6
34
33.528
34.290
1 3/4
5
39.5
38.964
39.827
2
4
45.2
44.679
45.593