Inch sized fasteners and more

UNC- coarse thread ANSI B1.1

Table for UNC- coarse thread ANSI B1.1

Threads per Inch

pilot holeØ mm

Millimeter

Inch Decimal

Nr. 00

90

1,1938

0,0470

Nr. 1

64

1,55

1,8542

0,0730

Nr. 2

56

1,85

2,1844

0,0860

Nr. 3

48

2,10

2,5146

0,0990

Nr. 4

40

2,35

2,8448

0,1120

Nr. 5

40

2,65

3,1750

0,1250

Nr. 6

32

2,85

3,5052

0,1380

Nr. 8

32

3,45

4,1656

0,1640

Nr. 10

24

3,90

4,7625

0,1875

Nr. 12

24

4,50

5,4864

0,3125

1/4

20

5,20

6,3500

0,3750

5/16

18

6,60

7,9375

0,3125

3/8

16

8,00

9,5250

0,3750

7/16

14

9,40

11,1125

0,4375

1/2

13

10,75

12,7000

0,5000

9/16

12

12,25

14,2875

0,5625

5/8

11

13,50

15,8750

0,6250

11/16

11

17,4625

0,6875

3/4

10

16,50

19,0500

0,7500

13/16

10

20,6375

0,8125

7/8

9

19,50

22,2250

0,8750

15/16

9

23,8125

0,9375

1

8

22,25

25,4000

1,0000

1.1/8

7

25,00

28,5750

1,1250

1.1/4

7

28,25

31,7500

1,2500

1.3/8

6

30,75

34,9250

1,3750

1.1/2

6

34,00

38,1000

1,5000

1.5/8

5

41,2750

1,6250

1.3/4

5

39,50

44,4500

1,7500

1.7/8

4.1/2

47,6250

1,8750

2

4.1/2

45,25

50,8000

2,0000