ASME B18.2.2 Hex Slotted Nuts

Nominal Size or Basic Major Dia. of Thread		Width Across Flats F			Width Across Corners G		Thickness H			Unslotted Thickness T		Width of Slot S
Nominal Size or Basic Major Dia. of Thread		Basic	Max.	Min.	Max.	Min.	Basic	Max.	Min.	Max.	Min.	Max.	Min.
ASME B18.2.2 - 1⁄4	0.25	1⁄2	0.5	0.488	0.577	0.556	15⁄64	0.25	0.218	0.15	0.13	0.1	0.07
ASME B18.2.2 - 5⁄16	0.3125	9⁄16	0.562	0.546	0.65	0.622	19⁄64	0.314	0.28	0.21	0.19	0.12	0.09
ASME B18.2.2 - 3⁄8	0.375	11⁄16	0.688	0.669	0.794	0.763	23⁄64	0.377	0.341	0.24	0.22	0.15	0.12
ASME B18.2.2 - 7⁄16	0.4375	3⁄4	0.75	0.728	0.866	0.83	27⁄64	0.441	0.403	0.28	0.26	0.15	0.12
ASME B18.2.2 - 1⁄2	0.5	7⁄8	0.875	0.85	1.01	0.969	31⁄64	0.504	0.464	0.34	0.32	0.18	0.15
ASME B18.2.2 - 9⁄16	0.5625	15⁄16	0.938	0.909	1.083	1.037	35⁄64	0.568	0.526	0.37	0.35	0.18	0.15
ASME B18.2.2 - 5⁄8	0.625	1 1⁄16	1.062	1.031	1.227	1.175	39⁄64	0.631	0.587	0.4	0.38	0.24	0.18
ASME B18.2.2 - 3⁄4	0.75	1 1⁄4	1.25	1.212	1.443	1.382	47⁄64	0.758	0.71	0.49	0.47	0.24	0.18
ASME B18.2.2 - 7⁄8	0.875	17⁄16	1.438	1.394	1.66	1.589	55⁄64	0.885	0.833	0.62	0.59	0.24	0.18
ASME B18.2.2 - 1	1	15⁄8	1.625	1.575	1.876	1.796	63⁄64	1.012	0.956	0.72	0.69	0.3	0.24
ASME B18.2.2 - 11⁄8	1.125	113⁄16	1.812	1.756	2.093	2.002	17⁄64	1.139	1.079	0.78	0.75	0.33	0.24
ASME B18.2.2 - 11⁄4	1.25	2	2	1.938	2.309	2.209	17⁄32	1.251	1.187	0.86	0.83	0.4	0.31
ASME B18.2.2 - 13⁄8	1.375	23⁄16	2.188	2.119	2.526	2.416	111⁄32	1.378	1.31	0.99	0.95	0.4	0.31
ASME B18.2.2 - 11⁄2	1.5	23⁄8	2.375	2.3	2.742	2.622	115⁄32	1.505	1.433	1.05	1.01	0.46	0.37
ASME B18.2.2 - 13⁄4	1.75	23⁄4	2.75	2.662	3.175	3.035	123⁄32	1.759	1.679	1.24	1.2	0.52	0.43
ASME B18.2.2 - 2	2	31⁄8	3.125	3.025	3.608	3.449	131⁄32	2.013	1.925	1.43	1.38	0.52	0.43
ASME B18.2.2 - 21⁄4	2.25	31⁄2	3.5	3.388	4.041	3.862	213⁄64	2.251	2.155	1.67	1.62	0.52	0.43
ASME B18.2.2 - 21⁄2	2.5	37⁄8	3.875	3.75	4.474	4.275	229⁄64	2.505	2.401	1.79	1.74	0.64	0.55
ASME B18.2.2 - 23⁄4	2.75	41⁄4	4.25	4.112	4.907	4.688	245⁄64	2.759	2.647	2.05	1.99	0.64	0.55
ASME B18.2.2 - 3	3	45⁄8	4.625	4.475	5.34	5.102	261⁄64	3.013	2.893	2.23	2.17	0.71	0.62
ASME B18.2.2 - 31⁄4	3.25	5	5	4.838	5.774	5.515	33⁄16	3.252	3.124	2.47	2.41	0.71	0.62
ASME B18.2.2 - 31⁄2	3.5	53⁄8	5.375	5.2	6.207	5.928	37⁄16	3.506	3.37	2.72	2.65	0.71	0.62
ASME B18.2.2 - 33⁄4	3.75	53⁄4	5.75	5.562	6.64	6.341	311⁄16	3.76	3.616	2.97	2.9	0.71	0.62
ASME B18.2.2 - 4	4	61⁄8	6.125	5.925	7.073	6.755	315⁄16	4.014	3.862	3.22	3.15	0.71	0.62
All dimensions are in inches. Bold type indicates nuts unified dimensionally with British and Canadian Standards. Threads are Unified Coarse-, Fine-, or 8-thread series (UNC, UNF, or 8UN), Class 2B. Unification of fine-thread nuts is limited to sizes 1 inch and under.