Dimensions of 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.
No.6	0.1380	0.302	0.312	0.342	0.361	0.406	0.422	0.156	0.171	0.10	0.02	0.014
8	0.1640	0.334	0.344	0.381	0.397	0.452	0.469	0.187	0.203	0.13	0.02	0.016
10	0.1900	0.365	0.375	0.416	0.433	0.480	0.500	0.203	0.219	0.13	0.03	0.017
12	0.2160	0.428	0.438	0.488	0.505	0.574	0.594	0.222	0.236	0.14	0.04	0.020
1/4	0.2500	0.428	0.438	0.488	0.505	0.574	0.594	0.222	0.236	0.14	0.04	0.020
5/16	0.3125	0.489	0.500	0.557	0.577	0.660	0.680	0.268	0.283	0.17	0.04	0.023
3/8	0.3750	0.551	0.562	0.628	0.650	0.728	0.750	0.330	0.347	0.23	0.04	0.025
7/16	0.4375	0.675	0.688	0.768	0.794	0.910	0.937	0.375	0.395	0.26	0.04	0.032
1/2	0.5000	0.736	0.750	0.840	0.866	1.000	1.031	0.437	0.458	0.31	0.05	0.035
9/16	0.5625	0.861	0.875	0.982	1.010	1.155	1.188	0.483	0.506	0.35	0.05	0.040
5/8	0.6250	0.922	0.938	1.051	1.083	1.248	1.281	0.545	0.569	0.40	0.05	0.044
3/4	0.7500	1.088	1.125	1.240	1.299	1.460	1.500	0.627	0.675	0.46	0.06	0.051