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| Nominal Size or Basic Major Dia of Thread | E | F | G | B | K | H | H1 | R2 | A | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Body Dia | Width Across Flats | Width Across Corners | Flange Dia | Flange Thickness | Head Height | Hex Height | Flange Top Radius | Gaging Ring Thickness | |||||||
| Max | Min | Basic | Max | Min | Max | Min | Max | Min | Max | Min | Max | Max | Min | ||
| ¼ | 0.2500 | 0.2500 | 0.2450 | 3/8 | 0.3750 | 0.367 | 0.433 | 0.409 | 0.56 | 0.04 | 0.28 | 0.17 | 0.015 | 0.0514 | 0.0511 |
| 5⁄16 | 0.3125 | 0.3125 | 0.3065 | 1/2 | 0.5000 | 0.489 | 0.577 | 0.548 | 0.68 | 0.05 | 0.32 | 0.21 | 0.019 | 0.0643 | 0.0640 |
| ⅜ | 0.3750 | 0.3750 | 0.3690 | 9/16 | 0.5625 | 0.551 | 0.650 | 0.618 | 0.081 | 0.06 | 0.39 | 0.25 | 0.022 | 0.0771 | 0.0768 |
| 7⁄16 | 0.4375 | 0.4375 | 0.4305 | 5/8 | 0.6250 | 0.612 | 0.722 | 0.685 | 0.93 | 0.07 | 0.46 | 0.30 | 0.026 | 0.0900 | 0.0897 |
| ½ | 0.5000 | 0.5000 | 0.4930 | 3/4 | 0.7500 | 0.736 | 0.866 | 0.825 | 1.07 | 0.08 | 0.51 | 0.34 | 0.030 | 0.1029 | 0.1026 |
| 9⁄16 | 0.5625 | 0.5625 | 0.5545 | 13⁄16 | 0.8125 | 0.798 | 0.938 | 0.895 | 1.19 | 0.09 | 0.57 | 0.38 | 0.034 | 0.1157 | 0.1154 |
| ⅝ | 0.6250 | 0.6250 | 0.6170 | 15⁄16 | 0.9375 | 0.922 | 1.083 | 1.034 | 1.33 | 0.10 | 0.62 | 0.42 | 0.036 | 0.1286 | 0.1283 |
| ¾ | 0.7500 | 0.7500 | 0.7410 | 1-⅛ | 1.1250 | 1.100 | 1.299 | 1.234 | 1.59 | 0.11 | 0.73 | 0.51 | 0.045 | 0.1543 | 0.1540 |
| See Para. 23 | 18 | 5 | 8 | 4 | 8 | 5 | |||||||||
| Nominal Size or Basic Major Dia of Thread | T | B1 | Runout of Bearing Surface FIM | Lr | Y | ||||
|---|---|---|---|---|---|---|---|---|---|
| Gaging Ring Dia | Bearing Dia | Thread Length | Transition Thread Length | ||||||
| For Screws with L ≤ 6 in. | For Screws with L > 6 in. | For Screws with L ≤ 6 in. | For Screws with L > 6 in. | ||||||
| Max | Min | Min | Max | Basic | Max | Max | |||
| ¼ | 0.2500 | 0.4093 | 0.4090 | 0.48 | 0.010 | 0.750 | 1.000 | 0.400 | 0.650 |
| 5⁄16 | 0.3125 | 0.5483 | 0.5480 | 0.60 | 0.011 | 0.875 | 1.125 | 0.417 | 0.667 |
| ⅜ | 0.3750 | 0.6183 | 0.6180 | 0.73 | 0.012 | 1.000 | 1.250 | 0.438 | 0.688 |
| 7⁄16 | 0.4375 | 0.6853 | 0.6850 | 0.85 | 0.013 | 1.125 | 1.375 | 0.464 | 0.714 |
| ½ | 0.5000 | 0.8253 | 0.8250 | 0.98 | 0.014 | 1.250 | 1.500 | 0.481 | 0.731 |
| 9⁄16 | 0.5625 | 0.8953 | 0.8950 | 1.10 | 0.015 | 1.375 | 1.625 | 0.750 | 0.750 |
| ⅝ | 0.6250 | 1.0343 | 1.0340 | 1.26 | 0.017 | 1.500 | 1.750 | 0.773 | 0.773 |
| ¾ | 0.7500 | 1.2343 | 1.2340 | 1.47 | 0.020 | 1.750 | 2.000 | 0.800 | 0.800 |
| See Para. 23 | 5 | 9 | 7 | 12 | 15 | ||||