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| Nominal Size or Basic Screw Diameter | Threads per inch | Wing Spread, A | Wing Height, B | Wing Thickness, C | Between Wings, D | Boss Diameter, E | Boss Height, G | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | ||
| 5 | 40 | 0.82 | 0.80 | 0.25 | 0.23 | 0.09 | 0.08 | 0.21 | 0.19 | 0.26 | 0.24 | 0.17 | 0.15 |
| 6 | 32 | 0.82 | 0.80 | 0.25 | 0.23 | 0.09 | 0.08 | 0.21 | 0.19 | 0.26 | 0.24 | 0.17 | 0.15 |
| 8 | 32 | 1.01 | 0.99 | 0.28 | 0.27 | 0.11 | 0.09 | 0.29 | 0.28 | 0.36 | 0.34 | 0.19 | 0.18 |
| 10 | 24 and 32 | 1.01 | 0.99 | 0.28 | 0.27 | 0.11 | 0.09 | 0.29 | 0.28 | 0.36 | 0.34 | 0.19 | 0.18 |
| 12 | 24 | 1.20 | 1.18 | 0.32 | 0.31 | 0.12 | 0.11 | 0.38 | 0.37 | 0.44 | 0.43 | 0.22 | 0.20 |
| 1/4 | 20 | 1.20 | 1.18 | 0.32 | 0.31 | 0.12 | 0.11 | 0.38 | 0.37 | 0.44 | 0.43 | 0.22 | 0.20 |
| 5/16 | 18 | 1.51 | 1.49 | 0.36 | 0.35 | 0.14 | 0.12 | 0.44 | 0.43 | 0.51 | 0.49 | 0.24 | 0.23 |
| 3/8 | 16 | 1.89 | 1.86 | 0.58 | 0.55 | 0.20 | 0.17 | 0.44 | 0.43 | 0.63 | 0.62 | 0.37 | 0.35 |
Notes :
Sizes shown in boldface are preferred.