BS 4168 Hexagon Socket Head Cap Screws

Nominal Size,^a d	Body Diameter, D		Head Diameter, A		Head Height, H			Hexagon Socket Size, J^b	Key Engagement, K	Wall Thickness, W	Fillet
	Body Diameter, D		Head Diameter, A		Head Height, H			Hexagon Socket Size, J^b	Key Engagement, K	Wall Thickness, W	Rad., F	Dia., d_a
	Max	Min	Max^c	Max^d	Min	Max	Min	Nom	Min	Min	Min	Max
BS 4168 - M1.6	1.6	1.46	3	3.14	2.86	1.6	1.46	1.5	0.7	0.55	0.1	2
BS 4168 - M2	2	1.86	3.8	3.98	3.62	2	1.86	1.5	1	0.55	0.1	2.6
BS 4168 - M2.5	2.5	2.36	4.5	4.68	4.32	2.5	2.36	2	1.1	0.85	0.1	3.1
BS 4168 - M3	3	2.86	5.5	5.68	5.32	3	2.86	2.5	1.3	1.15	0.1	3.6
BS 4168 - M4	4	3.82	7	7.22	6.78	4	3.82	3	2	1.4	0.2	4.7
BS 4168 - M5	5	4.82	8.5	8.72	8.28	5	4.82	4	2.5	1.9	0.2	5.7
BS 4168 - M6	6	5.82	10	10.22	9.78	6	5.7	5	3	2.3	0.25	6.8
BS 4168 - M8	8	7.78	13	13.27	12.73	8	7.64	6	4	3.3	0.4	9.2
BS 4168 - M10	10	9.78	16	16.27	15.73	10	9.64	8	5	4	0.4	11.2
BS 4168 - M12	12	11.73	18	18.27	17.73	12	11.57	10	6	4.8	0.6	14.2
BS 4168 - (M14)	14	13.73	21	21.33	20.67	14	13.57	12	7	5.8	0.6	16.2
BS 4168 - M16	16	15.73	24	24.33	23.67	16	15.57	14	8	6.8	0.6	18.2
BS 4168 - M20	20	19.67	30	30.33	29.67	20	19.48	17	10	8.6	0.8	22.4
BS 4168 - M24	24	23.67	36	36.39	35.61	24	23.48	19	12	10.4	0.8	26.4
BS 4168 - M30	30	29.67	45	45.39	44.61	30	29.48	22	15.5	13.1	1	33.4
BS 4168 - M36	36	35.61	54	54.46	53.54	36	35.38	27	19	15.3	1	39.4
a The size shown in ( ) is non-preferred. b See Table 2 for min/max. c For plain heads. d For knurled heads. All dimensions are given in millimeters.