Challenge (Europe) Ltd


Technical Information for Nuts

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STANDARD NUT DIMENSIONS - ISOMETRIC COARSE

 

Size

 

Pitch

Isometric Coarse - B.S. 3692

Hex
A/F

Thickness

Head Depth
Bolts/Sets

Full Nuts

Lock Nuts

M1.6

0.35

3.2

1.3

-

1.225

M2

4.0

4.0

1.6

-

1.525

M2.5

0.45

5.0

2.0

-

1.825

M3

0.5

5.5

2.4

-

2.125

M4

0.7

7.0

3.2

2.0

2.925

M5

0.8

8.0

4.0

2.5

3.650

M6

1.0

10.0

5.0

3.0

4.150

M8

1.25

13.0

6.5

5.0

6.650

M10

1.05

17.0

8.0

6.0

7.180

M12

1.75

19.0

10.0

7.0

8.180

M16

2.0

24.0

13.0

8.0

10.180

M20

2.5

30.0

16.0

9.0

13.215

M24

3.0

36.0

19.0

10.0

15.215

M30

3.5

46.0

24.0

12.0

19.260

M36

4.0

55.0

29.0

14.0

23.260

METRIC WING NUTS TO BS 856: 1969

Blank
No.

Thread
Size

Width
Across
Wings

Depth
of
Wings

Depth
of
Boss

Large
dia. of
Boss

Small
dia. of
Boss


T
A
B
L
E

1

1

M3

22.0

13.5

7

9.0

6.5

2

M4 & M5

25.5

15.0

9

10.0

8.0

3

M6

30.0

18.0

11.0

13.0

9.5

4

M8

38.0

23.0

13

16.0

12.0

5

M10

44.5

25.5

14

17.5

14.0

6

M12

51.0

28.5

15

19.0

16.0

7

M14

59.0

32.0

17

22.0

17.5

8

M16

63.5

36.5

19

25.5

20.5

9

M18

78.0

41.0

22

32.0

27.0

T
A
B
L
E

2

1

M3

16.5

9

3

8

5

2

M4 & M5

21.5

11

4.5

11

6

3

M6

27

13

5

12

8

4

M8

31

16

6

14

9.5

5

M10

36

18

7

17

12

6

M12

47.5

23

9.5

22

16

8

M16

68

35

13.5

29.5

22

For information on imperial sizes for the following nuts, please contact us

  • Standard Nut Dimensions - BA - Unified, BS Whit, BS Fine
  • Imperial Wing Nuts to BS 856: 1969
  • Hexagon Dome Nuts