Dimensions of 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		Maximum Wrenching Length, J	Maximum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FLM
		Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
1/4	0.2500	0.428	0.438	0.488	0.505	0.700	0.728	0.281	0.312	0.15	0.04	0.024
5/16	0.3125	0.489	0.500	0.557	0.577	0.790	0.820	0.343	0.375	0.20	0.04	0.028
3/8	0.3750	0.551	0.562	0.628	0.650	0.885	0.915	0.390	0.406	0.24	0.04	0.031
7/16	0.4375	0.675	0.688	0.768	0.794	1.100	1.131	0.437	0.468	0.26	0.04	0.038
1/2	0.5000	0.736	0.750	0.840	0.866	1.175	1.205	0.485	0.515	0.29	0.06	0.041
9/16	0.5625	0.861	0.875	0.982	1.010	1.260	1.300	0.546	0.578	0.37	0.06	0.044
5/8	0.6250	0.922	0.938	1.051	1.083	1.280	1.360	0.600	0.640	0.42	0.06	0.045