ASME B18.2.2 Large Hex Flange Nuts

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Diameter Flange, B		Nut Thickness, H		Minimum Wrenching Length, J	Minimum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FIM (mm)
Nominal Size	Basic Major Diameter of Thread	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Minimum Wrenching Length, J	Minimum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FIM (mm)
ASME B18.2.2 - 1⁄4	6.350	10.871	11.125	12.395	12.827	17.780	18.491	7.137	7.925	3.810	1.016	0.610
ASME B18.2.2 - 5⁄16	7.938	12.421	12.700	14.148	14.656	20.066	20.828	8.712	9.525	5.080	1.016	0.711
ASME B18.2.2 - 3⁄8	9.525	13.995	14.275	15.951	16.510	22.479	23.241	9.906	10.312	6.096	1.016	0.787
ASME B18.2.2 - 7⁄16	11.113	17.145	17.475	19.507	20.168	27.940	28.727	11.100	11.887	6.604	1.016	0.965
ASME B18.2.2 - 1⁄2	12.700	18.694	19.050	21.336	21.996	29.845	30.607	12.319	13.081	7.366	1.524	1.041
ASME B18.2.2 - 9⁄16	14.288	21.869	22.225	24.943	25.654	32.004	33.020	13.868	14.681	9.398	1.524	1.118
ASME B18.2.2 - 5⁄8	15.875	23.419	23.825	26.695	27.508	32.512	34.544	15.240	16.256	10.668	1.524	1.143
GENERAL NOTES: (a) For additional requirements refer to section 3, General Data. (b) Concentricity of Tapped Hole. Axis of tapped hole shall be concentric with axis of nut body within a tolerance equal to 3% (6% FIM) of the maximum width across flats.

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Diameter Flange, B		Nut Thickness, H		Minimum Wrenching Length, J	Minimum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FIM
Nominal Size	Basic Major Diameter of Thread	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Minimum Wrenching Length, J	Minimum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FIM
ASME B18.2.2 - 1⁄4	0.25	0.428	0.438	0.488	0.505	0.7	0.728	0.281	0.312	0.15	0.04	0.024
ASME B18.2.2 - 5⁄16	0.3125	0.489	0.5	0.557	0.577	0.79	0.82	0.343	0.375	0.2	0.04	0.028
ASME B18.2.2 - 3⁄8	0.375	0.551	0.562	0.628	0.65	0.885	0.915	0.39	0.406	0.24	0.04	0.031
ASME B18.2.2 - 7⁄16	0.4375	0.675	0.688	0.768	0.794	1.1	1.131	0.437	0.468	0.26	0.04	0.038
ASME B18.2.2 - 1⁄2	0.5	0.736	0.75	0.84	0.866	1.175	1.205	0.485	0.515	0.29	0.06	0.041
ASME B18.2.2 - 9⁄16	0.5625	0.861	0.875	0.982	1.01	1.26	1.3	0.546	0.578	0.37	0.06	0.044
ASME B18.2.2 - 5⁄8	0.625	0.922	0.938	1.051	1.083	1.28	1.36	0.6	0.64	0.42	0.06	0.045
GENERAL NOTES: (a) For additional requirements refer to section 3, General Data. (b) Concentricity of Tapped Hole. Axis of tapped hole shall be concentric with axis of nut body within a tolerance equal to 3% (6% FIM) of the maximum width across flats.