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JB /T 6687:1993 12-Point Flange Nut

JB/T 6687:1993 12-Point Flange Nut features a twelve-point drive profile combined with an integrated flange bearing surface, making it suitable for compact joints requiring efficient tightening. The twelve-point geometry allows tool repositioning at smaller angles, while the flange increases contact area and improves local clamping behavior.

It can be used in engine components, mechanical transmission units, compact equipment, and high-strength assemblies. Compared with a standard hex nut, the twelve-point form offers advantages in tool accessibility, torque transfer, and assembly speed, especially where quick positioning and stable preload are required.

Different strength classes, materials, and surface finishes can be selected according to the mating fastener system to improve wear resistance, corrosion protection, and fastening reliability under high load conditions.

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PREV：No previous product NEXT：DIN 74361-2 (A):1982 Type A Wheel Spherical Flange Nut

Dimensions unit: mm

Thread size D

M6

M8

M10

M12

M16

M20

M24

M27

M30

M33

M36

M39

M42

M45

P

Pitch

1

1.25

1.5

1.75

2

2.5

3

3

3

3

3

3

3

3

db

Max.

7.1

9.4

11.5

13.5

17.7

21.9

26

29

33

36

39

43

46

49

Min.

7.04

9.34

11.44

13.43

17.63

21.82

25.92

28.92

32.92

35.9

38.9

42.9

45.9

48.9

e

Min.

8.98

11.23

13.51

15.75

21.42

27.12

33.96

36.2

40.76

46.46

46.46

52.16

56.72

62.36

m

Nominal

9

11

12

17

20

23

32

34

39

41

44

49

53

57

Max.

9.18

11.21

12.21

17.21

20.26

23.26

32.31

34.31

39.31

41.31

44.31

49.31

53.37

57.37

Min.

8.82

10.79

11.79

16.79

19.74

22.74

31.69

33.69

38.69

40.69

43.69

48.69

52.63

56.63

s

Max.

8

10

12

14

19

24

30

32

36

41

41

46

50

55

Min.

7.88

9.85

11.85

13.82

18.79

23.79

29.79

31.75

35.75

40.75

40.75

45.75

49.75

54.7

c

Max.

1.2

1.4

1.6

2.5

2.5

3

4.5

4.5

5.5

5.5

6.5

7.5

7.5

8.5

Min.

0.95

1.15

1.35

2.25

2.25

2.75

4.2

4.2

5.2

5.2

6.14

7.14

7.14

8.14

dc

Max.

11

13

16.5

21

26.7

31.2

41.3

41.3

54

54

59

63.5

67.5

71.5

Min.

10.82

12.82

16.32

20.79

26.49

30.95

41.05

41.05

53.7

53.7

58.7

63.2

67.2

71.2

m1

Min.

3

4

4

6

8

10

13

13

17

17

20

23

25

27

Unit weight≈kg

0.002 1

0.0038

0.0066

0.0126

0.0262

0.0511

0.1165

0.121

0.1975

0.2637

0.3088

0.3849

0.5533

0.7548

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