ASME B18.2.2 Heavy 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	7⁄16	0.438	0.428	0.505	0.488	7⁄32	0.226	0.212	0.14	0.12	0.1	0.07
ASME B18.2.2 - 5⁄16	0.3125	1⁄2	0.5	0.489	0.577	0.577	17⁄64	0.273	0.258	0.18	0.16	0.12	0.09
ASME B18.2.2 - 3⁄8	0.375	9⁄16	0.562	0.551	0.65	0.628	21⁄64	0.337	0.32	0.21	0.19	0.15	0.12
ASME B18.2.2 - 7⁄16	0.4375	11⁄16	0.688	0.675	0.794	0.768	3⁄8	0.385	0.365	0.23	0.21	0.15	0.12
ASME B18.2.2 - 1⁄2	0.5	3⁄4	0.75	0.736	0.866	0.84	7⁄16	0.448	0.427	0.29	0.27	0.18	0.15
ASME B18.2.2 - 9⁄16	0.5625	7⁄8	0.875	0.861	1.01	0.982	31⁄64	0.496	0.473	0.31	0.29	0.18	0.15
ASME B18.2.2 - 5⁄8	0.625	15⁄16	0.938	0.922	1.083	1.051	35⁄64	0.559	0.535	0.34	0.32	0.24	0.18
ASME B18.2.2 - 3⁄4	0.75	1 1⁄8	1.125	1.088	1.299	1.24	41⁄64	0.665	0.617	0.4	0.38	0.24	0.18
ASME B18.2.2 - 7⁄8	0.875	1 5⁄16	1.312	1.269	1.516	1.447	3⁄4	0.776	0.724	0.52	0.49	0.24	0.18
ASME B18.2.2 - 1	1	1 1⁄2	1.5	1.45	1.732	1.653	55⁄64	0.887	0.831	0.59	0.56	0.3	0.24
ASME B18.2.2 - 11⁄8	1.125	1 11⁄16	1.688	1.631	1.949	1.859	31⁄32	0.999	0.939	0.64	0.61	0.33	0.24
ASME B18.2.2 - 11⁄4	1.25	1 7⁄8	1.875	1.812	2.165	2.066	11⁄16	1.094	1.03	0.7	0.67	0.4	0.31
ASME B18.2.2 - 13⁄8	1.375	2 1⁄16	2.062	1.994	2.382	2.273	111⁄64	1.206	1.138	0.82	0.78	0.4	0.31
ASME B18.2.2 - 11⁄2	1.5	2 1⁄4	2.25	2.175	2.598	2.48	19⁄32	1.317	1.245	0.86	0.82	0.46	0.37
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.