Standard: ISO (Coarse)

Nominal Thread (D)

Height (H)

M4

0.70

7.0

5.0 mm

M5

0.75

8.0

6.0 mm

M6

0.80

10.0

7.5 mm

M8

1.25

13.0

9.5 mm

M10

1.50

17.0

12.0 mm

M12

1.75

19.0

15.0 mm

M14

2.00

22.0

16.0 mm

M16

2.00

24.0

19.0 mm

M18

2.50

27.0

21.0 mm

M20

2.50

30.0

22.0 mm

M22

2.50

32.0

26.0 mm

M24

3.00

36.0

27.0 mm

M27

3.00

41.0

30.0 mm

M30

3.50

46.0

33.0 mm

M33

3.50

50.0

35.0 mm

M36

4.00

55.0

38.0 mm

M39

4.00

60.0

40.0 mm

M42

4.50

65.0

46.0 mm

M45

4.50

70.0

48.0 mm

M48

5.00

75.0

50.0 mm

Standard: ISO (Fine)

Nominal Thread (D)

Wrench Size (S)

Height (H)

M8

1.00

13.0

9.5 mm

M10

1.00

17.0

12.0 mm

M10

1.25

17.0

12.0 mm

M12

1.25

19.0

15.0 mm

M12

1.50

19.0

15.0 mm

M14

1.50

22.0

16.0 mm

M16

1.50

24.0

19.0 mm

M18

1.50

27.0

21.0 mm

M18

2.00

27.0

21.0 mm

M20

1.50

30.0

22.0 mm

M20

2.00

30.0

22.0 mm

M22

1.50

32.0

26.0 mm

M22

2.00

32.0

26.0 mm

M24

2.00

36.0

27.0 mm

M27

2.00

41.0

30.0 mm

M30

2.00

46.0

33.0 mm

M33

2.00

50.0

35.0 mm

M36

3.00

55.0

38.0 mm

M39

3.00

60.0

40.0 mm

M42

3.00

65.0

46.0 mm

M45

3.00

70.0

48.0 mm

M48

3.00

75.0

50.0 mm

Standard: UNC

Nominal Thread (D)

Wrench Size (S)

1/4''

20

7/16''

5/16''

18

1/2''

3/8''

16

9/16''

7/16''

14

11/16''

1/2''

13

3/4''

9/16''

12

7/8''

5/8''

11

15/16''

3/4''

10

1-1/8''

7/8''

9

1-5/16''

1''

8

1-1/2''

1-1/8''

7

1-11/16''

1-1/4''

7

1-7/8''

1-3/8''

6

2-1/16''

1-1/2''

6

2-1/4''

Standard: UNF

Nominal Thread (D)

Wrench Size (S)

1/4''

28

7/16''

5/16''

24

1/2''

3/8''

24

9/16''

7/16''

20

11/16''

1/2''

20

3/4''

9/16''

18

7/8''

5/8''

18

15/16''

3/4''

16

1-1/8''

7/8''

14

1-5/16''

1''

12

1-1/2''

1-1/8''

12

1-11/16''

1-1/4''

12

1-7/8''

1-3/8''

12

2-1/16''

1-1/2''

12

2-1/4''