ASME B18.16.6 Style NTU Nylon Insert Locknut Dimensions

Designation		Width Across Flats, A		Minimum Width Across Corners, B	Thickness, C		Minimum Hex Height, D	Maximum Runout of Bearing Surface With Thread P.D. FIM
Size	Nominal Diameter	Max.	Min.	Minimum Width Across Corners, B	Max.	Min.	Minimum Hex Height, D	Maximum Runout of Bearing Surface With Thread P.D. FIM
¼	0.2500	0.502	0.492	0.552	0.296	0.266	0.194	0.010
5⁄16	0.3125	0.564	0.553	0.622	0.328	0.298	0.212	0.011
⅜	0.3750	0.690	0.679	0.766	0.421	0.391	0.251	0.012
7⁄16	0.4375	0.752	0.741	0.837	0.453	0.423	0.316	0.013
½	0.5000	0.877	0.865	0.978	0.546	0.516	0.360	0.014
9⁄16	0.5625	0.940	0.928	1.051	0.578	0.548	0.421	0.015
⅝	0.6250	1.064	1.052	1.191	0.624	0.594	0.428	0.016
¾	0.7500	1.252	1.239	1.403	0.718	0.688	0.488	0.018
⅞	0.8750	1.440	1.427	1.615	0.796	0.766	0.535	0.020
1	1.0000	1.627	1.614	1.826	0.922	0.860	0.600	0.022
1¹/₈	1.1250	1.814	1.801	2.038	1.000	0.938	0.627	0.025
1¼	1.2500	2.008	1.973	2.232	1.140	1.078	0.720	0.028
1⅜	1.3750	2.197	2.159	2.444	1.219	1.157	0.767	0.031
1½	1.5000	2.384	2.344	2.622	1.344	1.282	0.810	0.034
1¾	1.7500	2.762	2.715	3.075	1.532	1.406	0.986	0.041
2	2.0000	3.137	3.086	3.497	1.735	1.609	1.016	0.047
2¼	2.2500	3.514	3.457	3.918	2.001	1.875	1.179	0.052
2½	2.5000	4.015	3.875	4.393	2.250	2.124	1.523	0.058
2¾	2.7500	4.015	3.875	4.393	2.250	2.124	1.523	0.064
3	3.0000	4.640	4.500	5.102	2.788	2.662	2.075	0.070