Metric DIN 316 wing screws/butterfly bolts are a type of thumb screw, which are fully threaded wing-shaped fasteners that require less torque for easy hand rotation. Sizes range from M4 to M24, and materials include stainless steel, carbon steel, copper, nylon, aluminum, etc. Related Products: Wing Screws.
DIN 316 Dimensions
| mm | P | a max | dk max | dk min | d1 max | d1 min | H max | H min | y max | y min | y1 max | y1 min | h max | h min | k max | k min |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M4 | 0.7 | 2.1 | 8 | 6 | 7 | 5.5 | 20 | 18 | 1.9 | 1.1 | 2.3 | 1.7 | 10.5 | 8.5 | 4.6 | 3.2 |
| M5 | 0.8 | 2.4 | 11 | 8 | 9 | 7.5 | 26 | 24 | 2.3 | 1.5 | 2.8 | 2.3 | 13 | 11 | 6.5 | 4 |
| M6 | 1 | 3 | 13 | 10 | 11 | 9 | 33 | 30 | 2.3 | 1.5 | 3.3 | 2.7 | 17 | 15 | 8 | 5 |
| M8 | 1.25 | 4 | 16 | 13 | 12.5 | 10.5 | 39 | 36 | 2.8 | 2 | 4.4 | 3.6 | 20 | 18 | 10 | 6.5 |
| M10 | 1.5 | 4.5 | 20 | 17 | 16.5 | 14.5 | 51 | 48 | 4.4 | 3.6 | 5.4 | 4.6 | 25 | 23 | 12 | 8 |
| M12 | 1.75 | 5.3 | 23 | 20 | 19.5 | 17.5 | 65 | 62 | 4.9 | 4.1 | 6.4 | 5.6 | 33.5 | 31 | 14 | 10 |
| M16 | 2 | 6 | 29 | 26 | 23 | 21 | 73 | 70 | 6.4 | 5.6 | 7.5 | 6.5 | 37.5 | 35 | 17 | 13 |
| M20 | 2.5 | 7.5 | 35 | 32 | 29 | 27 | 90 | 86 | 6.9 | 6.1 | 8 | 7 | 46.5 | 44 | 21 | 16 |
| M24 | 3 | 9 | 44 | 41 | 37.5 | 35 | 110 | 106 | 9.4 | 8.6 | 10.5 | 9.5 | 56.5 | 53.5 | 25 | 20 |