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
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.