BS 3692 Precision Hexagon Castle Nuts

Nominal Size and Thread Diameter^a d	Width Across Flats s		Width Across Corners e		Diameter d₂		Thickness		Thickness Lower Face of Nut to Bottom of Slot m		Width of Slot n		Radius (0.25 n) r	Eccentricity of the Slots
Nominal Size and Thread Diameter^a d	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Min.	Max.
BS 3692 - M4	7	6.85	8.1	7.74	...	...	5	4.7	3.2	2.9	1.45	1.2	0.3	0.18
BS 3692 - M5	8	7.85	9.2	8.87	...	...	6	5.7	4	3.7	1.65	1.4	0.35	0.18
BS 3692 - M6	10	9.78	11.5	11.05	...	...	7.5	7.14	5	4.7	2.25	2	0.5	0.18
BS 3692 - M8	13	12.73	15	14.38	...	...	9.5	9.14	6.5	6.14	2.75	2.5	0.625	0.22
BS 3692 - M10	17	16.73	19.6	18.9	...	...	12	11.57	8	7.64	3.05	2.8	0.7	0.22
BS 3692 - M12	19	18.67	21.9	21.1	17	16.57	15	14.57	10	9.64	3.8	3.5	0.875	0.27
BS 3692 - M14	22	21.67	25.4	24.49	19	18.48	16	15.57	11	10.57	3.8	3.5	0.875	0.27
BS 3692 - M16	24	23.67	27.7	26.75	22	21.48	19	18.48	13	12.57	4.8	4.5	1.125	0.27
BS 3692 - M18	27	26.67	31.2	30.14	25	24.48	21	20.48	15	14.57	4.8	4.5	1.125	0.27
BS 3692 - M20	30	29.67	34.6	33.53	28	27.48	22	21.48	16	15.57	4.8	4.5	1.125	0.33
BS 3692 - M22	32	31.61	36.9	35.72	30	29.48	26	25.48	18	17.57	5.8	5.5	1.375	0.33
BS 3692 - M24	36	35.38	41.6	39.98	34	33.38	27	26.48	19	18.48	5.8	5.5	1.375	0.33
BS 3692 - M27	41	40.38	47.3	45.63	38	37.38	30	29.48	22	21.48	5.8	5.5	1.375	0.33
BS 3692 - M30	46	45.38	53.1	51.28	42	41.38	33	32.38	24	23.48	7.36	7	1.75	0.33
BS 3692 - M33	50	49.38	57.7	55.8	46	45.38	35	34.38	26	25.48	7.36	7	1.75	0.39
BS 3692 - M36	55	54.26	63.5	61.31	50	49.38	38	37.38	29	28.48	7.36	7	1.75	0.39
BS 3692 - M39	60	59.26	69.3	66.96	55	54.26	40	39.38	31	30.38	7.36	7	1.75	0.39
BS 3692 - M42	65	64.26	75.1	72.61	58	57.26	46	45.38	34	33.38	9.36	9	2.25	0.39
BS 3692 - M45	70	69.26	80.8	78.26	62	61.26	48	47.38	36	35.38	9.36	9	2.25	0.39
BS 3692 - M48	75	74.26	86.6	83.91	65	64.26	50	49.38	38	37.38	9.36	9	2.25	0.39
BS 3692 - M52	80	79.26	92.4	89.56	70	69.26	54	53.26	42	41.38	9.36	9	2.25	0.46
BS 3692 - M56	85	84.13	98.1	95.07	75	74.26	57	56.26	45	44.38	9.36	9	2.25	0.46
BS 3692 - M60	90	89.13	103.9	100.72	80	79.26	63	62.26	48	47.38	11.43	11	2.75	0.46
BS 3692 - M64	95	94.13	109.7	106.37	85	84.13	66	65.26	51	50.26	11.43	11	2.75	0.46
BS 3692 - M68	100	99.13	115.5	112.02	90	89.13	69	68.26	54	53.26	11.43	11	2.75	0.46
a Sizes shown in parentheses are non-preferred. All dimensions are in millimeters. For illustration of hexagon slotted nuts and castle nuts