THUMB SCREWS WING STYLE ANSI/ASME B18.17 1968 (R1983) |
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All Dimensions in Inches |
Screw Diameter | Series | Head Blank Size |
Wing Spread | Wing Height | Wing Thickness | Boss Diameter | Boss Height | ||||||
Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | ||||
6/32 | 0.1380 | Heavy | A | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.43 | 0.39 | 0.18 | 0.14 |
8/32 | 0.1640 | Light | A | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.43 | 0.39 | 0.18 | 0.14 |
10/24 | 0.1900 | Light | A | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.43 | 0.39 | 0.18 | 0.14 |
10/32 | 0.1900 | Light | A | 0.91 | 0.78 | 0.47 | 0.34 | 0.14 | 0.10 | 0.43 | 0.39 | 0.18 | 0.14 |
12/24 | 0.2160 | Light | B | 1.10 | 0.97 | 0.57 | 0.43 | 0.18 | 0.14 | 0.50 | 0.45 | 0.22 | 0.17 |
1/4-20 | 0.2500 | Light | B | 1.10 | 0.97 | 0.57 | 0.43 | 0.18 | 0.14 | 0.50 | 0.45 | 0.22 | 0.17 |
5/16-18 | 0.3125 | Light | C | 1.25 | 1.12 | 0.65 | 0.53 | 0.21 | 0.17 | 0.58 | 0.51 | 0.25 | 0.20 |
3/8-16 | 0.3750 | Light | D | 1.44 | 1.31 | 0.79 | 0.65 | 0.24 | 0.20 | 0.70 | 0.64 | 0.30 | 0.26 |
7/16-14 | 0.4375 | Light | E | 1.94 | 1.81 | 1.00 | 0.87 | 0.33 | 0.26 | 0.93 | 0.86 | 0.39 | 0.35 |
1/2-13 | 0.5000 | Light | E | 1.94 | 1.81 | 1.00 | 0.87 | 0.33 | 0.26 | 0.93 | 0.86 | 0.39 | 0.35 |