Wing Bolt

A Bolt Having a Head Like a Wing Nut

wingnutwing 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

Different Types of Fasteners

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

 

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