ASME B18.2.1 Askew Head Bolts

Nominal Size or Basic product Diameter		Body Diameter, E		Width Across Flats, F		Width Across Corners, G		Head Height, H		Mid- Height H	Radius of Fillet, R		Maximum Unthreaded Length, S	Thread Length for Bolt Lengths, L_T
		Body Diameter, E		Width Across Flats, F		Width Across Corners, G		Head Height, H		Mid- Height H	Radius of Fillet, R			6 in. & Shorter	Over 6 in.
		Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Ref.	Max.	Min.		Nom.	Nom.
3/8	0.3750	0.388	0.360	0.562	0.544	0.795	0.747	0.317	0.277	0.250	0.03	0.01	0.250	1.000	1.250
1/2	0.5000	0.515	0.482	0.750	0.725	1.061	0.995	0.411	0.371	0.328	0.03	0.01	0.312	1.250	1.500
5/8	0.6250	0.642	0.605	0.938	0.906	1.326	1.244	0.520	0.480	0.422	0.06	0.02	0.344	1.500	1.750
3/4	0.7500	0.768	0.729	1.125	1.088	1.591	1.494	0.614	0.574	0.500	0.06	0.02	0.406	1.750	2.000
7/8	0.8750	0.895	0.852	1.312	1.269	1.856	1.742	0.723	0.683	0.594	0.06	0.02	0.438	2.000	2.250
1	1.0000	1.022	0.976	1.500	1.450	2.121	1.991	0.801	0.761	0.656	0.09	0.03	0.500	2.250	2.500