BS 1083 Precision Hexagon Nuts

Nominal Size D	Number of Threads per Inch		Total Thickness J		Lower Face to Bottom of Slot K		Castellated Portion		Slots
	Number of Threads per Inch		Total Thickness J		Lower Face to Bottom of Slot K		Diameter L		Width M		Depth N
	BSW	BSF	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Approx.
BS 1083 - 1⁄4	20	26	0.29	0.28	0.2	0.19	0.43	0.425	0.1	0.09	0.09
BS 1083 - 5⁄16	18	22	0.34	0.33	0.25	0.24	0.51	0.5	0.1	0.09	0.09
BS 1083 - 3⁄8	16	20	0.402	0.392	0.312	0.302	0.585	0.575	0.1	0.09	0.09
BS 1083 - 7⁄16	14	18	0.515	0.505	0.375	0.365	0.695	0.685	0.135	0.125	0.14
BS 1083 - 1⁄2	12	16	0.577	0.567	0.437	0.427	0.805	0.795	0.135	0.125	0.14
BS 1083 - 9⁄16	12	16	0.687	0.677	0.5	0.49	0.905	0.895	0.175	0.165	0.187
BS 1083 - 5⁄8	11	14	0.749	0.739	0.562	0.552	0.995	0.985	0.175	0.165	0.187
BS 1083 - 3⁄4	10	12	0.921	0.911	0.687	0.677	1.185	1.165	0.218	0.208	0.234
BS 1083 - 7⁄8	9	11	0.984	0.974	0.75	0.74	1.285	1.265	0.218	0.208	0.234
BS 1083 - 1	8	10	1.155	1.145	0.875	0.865	1.465	1.445	0.26	0.25	0.28
BS 1083 - 11⁄8	7	9	1.28	1.27	1	0.99	1.655	1.635	0.26	0.25	0.28
BS 1083 - 11⁄4	7	9	1.453	1.433	1.125	1.105	1.845	1.825	0.3	0.29	0.328
BS 1083 - 13⁄8a	...	8	1.578	1.558	1.25	1.23	2.035	2.015	0.3	0.29	0.328
BS 1083 - 11⁄2	6	8	1.703	1.683	1.375	1.355	2.2	2.18	0.3	0.29	0.328
BS 1083 - 13⁄4	5	7	2	1.98	1.625	1.605	2.555	2.535	0.343	0.333	0.375
BS 1083 - 2	4.5	7	2.218	2.198	1.75	1.73	2.735	2.715	0.426	0.416	0.468
a Not standard with BSW thread. For widths across flats, widths across corners, and diameter of washer face see Table 1. For dimensional notation, see diagram on page 1571. All dimensions in inches except where otherwise noted