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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 | 0.78 | 0.72 | 0.36 | 0.30 | 0.13 | 0.10 | 0.28 | 0.22 | 0.31 | 0.28 | 0.22 | 0.16 |
| 10 | 24 | 0.97 | 0.91 | 0.45 | 0.39 | 0.15 | 0.12 | 0.34 | 0.28 | 0.39 | 0.36 | 0.28 | 0.22 |
| 1/4 | 20 | 1.16 | 1.09 | 0.56 | 0.50 | 0.17 | 0.14 | 0.41 | 0.34 | 0.47 | 0.44 | 0.34 | 0.28 |
| 5/16 | 18 | 1.44 | 1.38 | 0.67 | 0.61 | 0.18 | 0.15 | 0.50 | 0.44 | 0.55 | 0.52 | 0.41 | 0.34 |
| 3/8 | 16 | 172 | 1.66 | 0.80 | 0.73 | 0.20 | 0.17 | 0.59 | 0.53 | 0.63 | 0.60 | 0.47 | 0.41 |
| 7/16 | 14 | 2.00 | 1.94 | 0.91 | 0.84 | 0.21 | 0.18 | 0.69 | 0.62 | 0.71 | 0.68 | 0.53 | 0.47 |
| 1/2 | 13 | 2.31 | 2.22 | 1.06 | 0.94 | 0.23 | 0.20 | 0.78 | 0.69 | 0.79 | 0.76 | 0.62 | 0.50 |
| 9/16 | 12 | 2.59 | 2.47 | 1.17 | 1.05 | 0.25 | 0.21 | 0.88 | 0.78 | 0.88 | 0.84 | 0.69 | 0.56 |
| 5/8 | 11 | 2.84 | 2.72 | 1.31 | 1.19 | 0.27 | 0.23 | 0.94 | 0.84 | 0.96 | 0.92 | 0.75 | 0.62 |
| 3/4 | 10 | 3.31 | 3.19 | 1.52 | 1.39 | 0.29 | 0.25 | 1.10 | 1.00 | 1.12 | 1.08 | 0.88 | 0.75 |