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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 | 0.92 | 0.89 | 0.70 | 0.67 | 0.16 | 0.15 | 0.26 | 0.24 | 0.38 | 0.36 | 0.25 | 0.24 |
| 6 | 32 | 0.92 | 0.89 | 0.70 | 0.67 | 0.16 | 0.15 | 0.26 | 0.24 | 0.38 | 0.36 | 0.25 | 0.24 |
| 8 | 32 | 0.92 | 0.89 | 0.70 | 0.67 | 0.16 | 0.15 | 0.26 | 0.24 | 0.38 | 0.36 | 0.25 | 0.24 |
| 10 | 24 and 32 | 1.14 | 1.12 | 0.85 | 0.83 | 0.19 | 0.17 | 0.32 | 0.30 | 0.44 | 0.42 | 0.29 | 0.27 |
| 12 | 24 | 1.14 | 1.12 | 0.85 | 0.83 | 0.19 | 0.17 | 0.32 | 0.30 | 0.44 | 0.42 | 0.29 | 0.27 |
| 1/4 | 20 | 1.14 | 1.12 | 0.85 | 0.83 | 0.19 | 0.17 | 0.32 | 0.30 | 0.44 | 0.42 | 0.29 | 0.27 |
| 5/16 | 18 | 1.29 | 1.27 | 1.04 | 1.02 | 0.23 | 0.22 | 0.39 | 0.36 | 0.50 | 0.49 | 0.35 | 0.34 |
| 3/8 | 16 | 1.51 | 1.49 | 1.20 | 1.18 | 0.27 | 0.25 | 0.45 | 0.42 | 0.62 | 0.60 | 0.43 | 0.42 |
Notes :
Sizes shown in boldface are preferred.