Dimensions of Serrated Flange Locknuts

Nominal Size or Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Flange Diameter, B		Nut Thickness, H		Minimum Hex Height, J	Minimum Flange Thickness, K	Maximum Perpendicularity of Bearing Surface
	Max	Min	Max	Min	Max	Min	Max	Min
6	0.312	0.302	0.361	0.342	0.422	0.408	0.171	0.156	0.10	0.02	0.014
8	0.344	0.334	0.397	0.381	0.469	0.452	0.203	0.187	0.13	0.02	0.016
10	0.375	0.365	0.433	0.416	0.500	0.480	0.219	0.203	0.13	0.03	0.017
12	0.438	0.428	0.505	0.488	0.594	0.574	0.236	0.222	0.14	0.04	0.020
1/4	0.438	0.428	0.505	0.488	0.594	0.574	0.236	0.222	0.14	0.04	0.020
5/16	0.500	0.489	0.577	0.557	0.680	0.660	0.283	0.268	0.17	0.04	0.023
3/8	0.562	0.551	0.650	0.628	0.750	0.728	0.347	0.330	0.23	0.04	0.025
7/16	0.688	0.675	0.794	0.768	0.937	0.910	0.395	0.375	0.26	0.04	0.032
1/2	0.750	0.736	0.866	0.840	1.031	1.000	0.458	0.437	0.31	0.05	0.035
9/16	0.875	0.861	1.010	0.982	1.188	1.155	0.506	0.483	0.35	0.05	0.040
5/8	0.938	0.922	1.083	1.051	1.281	1.248	0.569	0.545	0.40	0.05	0.044
3/4	1.125	1.088	1.299	1.240	1.500	1.460	0.675	0.627	0.46	0.06	0.051

Dimensions are in inches.

Proof Load and Torque Values

Nut Size and Thread per inch.	Proof Load, lb	Seating Torque
6 - 32	820	50 in. lb
6 - 40	900	55 in. lb
8 - 32	1250	60 in. lb
8 - 36	1350	65 in. lb
10 - 24	1650	70 in. lb
10 - 32	1800	75 in. lb
12 - 24	2200	90 in. lb
12 - 28	2300	95 in. lb
1/4 - 20	2900	9 ft-lb
1/4 - 28	3300	10 ft-lb
5/16 - 18	4700	14 ft-lb
5/16 - 24	5200	15 ft-lb
3/8 - 16	7000	27 ft-lb
3/8 - 24	7900	29 ft-lb
7/16 - 14	9550	40 ft-lb
7/16 - 20	10,700	43 ft-lb
1/2 - 13	12,800	62 ft-lb
1/2 - 20	14,400	68 ft-lb
9/16 - 12	16,400	82 ft-lb
9/16 - 18	18,300	90 ft-lb
5/8 - 11	20,300	125 ft-lb
5/8 - 18	22,900	140 ft-lb
3/4 - 10	30,000	240 ft-lb
3/4 - 16	33,600	269 ft-lb

General Note : Proof load values are based on 90,000 psi.