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 |