美制粗牙UNC

美制细牙UNF

螺纹规格

钻头直径（mm)

螺纹规格

钻头直径（mm)

2-56 
0.086-56

2.6

4-48
0.112-48

3.3

4-40
0.112-40

3.3

6-40
0.138-40

4.1

5-40
0.125-40

3.7

8-36
0.164-36

4.8

6-32
0.138-32

4.1

10-32
0.190-32

5.5

8-32 
0.164-32

4.8

1/4"-28

7.1

10-24 
0.190-24

5.6

5/16"-24

8.7

12-24
0.216-24

6.3

3/8"-24

10.3

1/4"-20

7.3

7/16"-20

12.1

5/16"-18

9.1

1/2"-20

13.7

3/8"-16

10.7

9/16"-18

15.4

7/16"-14

12.5

5/8"-18

17.0

1/2"-13

14.1

3/4"-16

20.3

9/16"-12

16.0

7/8"-14

23.6

5/8"-11

17.8

1"-14

26.8

3/4"-10

20.9

1"-12

27.1

7/8"-9

24.5

1 1/8"-12

30.3

1"-8

27.7

1 1/4"-12

33.5

1 1/8"-7

31.5

1 3/8"-12

36.7

1 1/4"-7

34.6

1 1/2"-12

39.8

1 3/8"-6

38.3

1 1/2"-6

41.5