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Bolts

Hex Flange Bolt

Dimensions of Hex Flange Screws

Nominal Size or Basic Major Dia of Thread E F G B K H H1 R2
Body Diameter Width Across Flats Width Across Corners Flange Diameter Flange Thickness Head Height Hex Height Flange Top Radius
Max Min Basic Max Min Max Min Max Min Max Min Max
1/4 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
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
3/8 0.3750 0.3750 0.3690 9/16 0.5625 0.551 0.650 0.618 0.81 0.06 0.39 0.25 0.022
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
1/2 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
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
5/8 0.6250 0.6250 0.6170 15/16 0.9375 0.922 1.083 1.034 1.33 0.10 0.62 0.42 0.038
3/4 0.7500 0.7500 0.7410 1-1/8 1.1250 1.100 1.299 1.234 1.59 0.11 0.73 0.51 0.045
See Para. 2.1.2
Nominal Size or Basic Major Dia of Thread B1 Runout of Bearing Surface FIM L1 Y Ring T Ring B
Bearing Dia Thread Length Transition Thread Length Inside Diameter Thickness Inside Diameter Thickness
For Screws With L <= 6 in. For Screws With L > 6 in. For Screws With L <= 6 in. For Screws With L > 6 in.
Min Max Basic Max Max +0.0000 -0.0003 Min +0.0000 -0.0003 +0.0000 -0.0003
1/4 0.2500 0.480 0.010 0.750 1.000 0.400 0.650 0.4093 0.500 0.4380 0.1186
5/16 0.3125 0.600 0.011 0.875 1.125 0.417 0.667 0.5483 0.500 0.5820 0.1457
3/8 0.3750 0.730 0.012 1.000 1.250 0.438 0.688 0.6183 0.500 0.6550 0.1729
7/16 0.4375 0.850 0.013 1.125 1.375 0.464 0.714 0.6853 0.500 0.7300 0.2100
1/2 0.5000 0.980 0.014 1.250 1.500 0.481 0.731 0.8253 0.500 0.8750 0.2371
9/16 0.5625 1.100 0.015 1.375 1.625 0.750 0.750 0.8953 0.500 0.9500 0.2643
5/8 0.6250 1.230 0.017 1.500 1.750 0.773 0.773 1.0343 0.500 1.0950 0.2914
3/4 0.7500 1.470 0.020 1.750 2.000 0.800 0.800 1.2343 0.500 1.3120 0.3557