| THUMB SCREWS ANSI/ASME B18.17 1968 (R1983) |
||
| All Dimensions in Inches | ||
| Screw Diameter | Head Width | Head Height | Head Thickness | ||||
| Max. | Min. | Max. | Min. | Max. | Min. | ||
| 6/32 | 0.1380 | 0.45 | 0.43 | 0.28 | 0.26 | 0.08 | 0.06 |
| 8/32 | 0.1640 | 0.51 | 0.49 | 0.32 | 0.30 | 0.09 | 0.07 |
| 10/24 | 0.1900 | 0.58 | 0.54 | 0.39 | 0.36 | 0.10 | 0.08 |
| 10/32 | 0.1900 | 0.58 | 0.54 | 0.39 | 0.36 | 0.10 | 0.08 |
| 12/24 | 0.2160 | 0.71 | 0.67 | 0.45 | 0.43 | 0.11 | 0.09 |
| 1/4-20 | 0.2500 | 0.83 | 0.80 | 0.52 | 0.48 | 0.16 | 0.14 |
| 5/16-18 | 0.3125 | 0.96 | 0.91 | 0.64 | 0.60 | 0.17 | 0.14 |
| 3/8-16 | 0.3750 | 1.09 | 1.03 | 0.71 | 0.67 | 0.22 | 0.18 |
| 7/16-14 | 0.4375 | 1.40 | 1.35 | 0.96 | 0.91 | 0.27 | 0.24 |
| 1/2-13 | 0.5000 | 1.54 | 1.46 | 1.09 | 1.03 | 0.33 | 0.29 |