Wing Bolt

learn about Wing Bolt

Author

India Fastener Solutions
February 27, 2024

A Bolt Having a Head Like a Wing Nut

A wingnut, wing nut or butterfly nut is a type of nut with two large metal “wings”, one on each side, so it can be easily tightened and loosened by hand without tools.

A similar fastener with a male thread is known as a  butterfly screw or a  Wing bolt.

 

  • Type A are cold forged or cold formed produced in regular, light and heavy dimensional series.

  • Type B are hot forged solid nuts available in three different wing styles.

  • Type C are die cast nuts available in three wing styles with variances between regular and heavy dimensional series

  • Type D are stamped sheet metal nuts available in three wing styles.

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d1 – the nominal diameter of the thread
P – thread pitch
l – length of bolt
d2 – head diameter
d3 – head diameter
e – bolt width
m – head height
h – head height including wings
a – length undercut
r1 – radius
r2 – radius
r3 – radius
g1 – width of the wing
g2 – width of the wing

Table according to DIN 316:

dimensions in mm

Thread d1

M4

M5

M6

M8

M10

M12

M16

M20

M24

P

0,7

0,8

1

1,25

1,5

1,75

2

2,5

3

a

max.

2,1

2,4

3

4

4,5

5,3

6

7,5

8

d2

max.

8

11

13

16

20

23

29

35

44

min.

6

8

10

13

17

20

26

32

41

d3

max.

7

9

11

12,5

16,5

19,5

23

29

37,5

min.

5,5

7,5

9

10,5

14,5

17,5

21

27

35

e

max.

20

26

33

39

51

65

73

90

110

min.

18

24

30

36

48

62

70

86

106

g1

max.

1,9

2,3

2,3

2,8

4,4

4,9

6,4

6,9

9,4

min.

1,1

1,5

1,5

2

3,6

4,1

5,6

6,1

8,6

g2

max.

2,3

2,8

3,3

4,4

5,4

6,4

7,5

8

10,5

min.

1,7

2,3

2,7

3,6

4,6

5,6

6,5

7

9,5

h

max.

10,5

13

17

20

25

33,5

37,5

46,5

56,5

min.

8,5

11

15

18

23

31

35

44

53,5

m

max.

4,6

6,5

8

10

12

14

17

21

25

min.

3,2

4

5

6,5

8

10

13

16

20

r1

approx.

3

4

5

6

8

10

11

14

18

r2

approx.

Radiused

1

1

1,2

1,6

2,5

r3

approx.

0,5

1

1

1

1,2

1,2

1,6

2

2,5

r4

approx.

2

2,5

3