Wings provide more leverage than spade-head thumb screws for greater torque while tightening. A zinc plating provides corrosion resistance in wet environments. Length is measured from under the head.
A thumb screw has a specially designed head that makes it easy to turn with one hand and ideal for use on parts that are frequently moved such as an access panel. The heads are winged, knurled or vertically tall and flat to provide an easy grip. A stainless steel screw is good for exterior applications. Use thumb screws from Grainger for easy maintenance and replacement of essential machine components.
| Screw Thread d | M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M24 | |
| P | Pitch | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3 |
| E | max | 8 | 11 | 13 | 16 | 20 | 23 | 29 | 35 | 44 |
| min | 6 | 8 | 10 | 13 | 17 | 20 | 26 | 32 | 41 | |
| D | 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 | |
| A | max | 20 | 26 | 33 | 39 | 51 | 65 | 73 | 90 | 110 |
| min | 18 | 24 | 30 | 36 | 48 | 62 | 70 | 86 | 106 | |
| c | 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 | |
| B | 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 | |
| G | max | 4.6 | 6.5 | 8 | 10 | 12 | 14 | 17 | 21 | 25 |
| min | 3.2 | 4 | 5 | 6.5 | 8 | 10 | 13 | 16 | 20 | |