Cap Screw Dimensions

Cap Screw Dimensions

Notes:
All linear dimensions in milli metres
Dimensions generally to BS EN ISO 4762 BS 3643- 2 & BS 4168 (superceded)

Nominal	Thread.	Hex Socket Size	Body diameter and Head height		Head Dia		Soc. length
Size	Pitch		Max	Min	Max	Min
		J	D /H		A		K
M3	0.5	2.50	3.00	2.86	5.50	5.20	1.3
M4	0.70	3.00	4.00	3.82	7.00	6.64	2.00
M5	0.8	4.00	5.00	4.82	8.50	8.14	2.70
M6	1.0	5.00	6.00	5.82	10.00	9.64	3.30
M8	1.25	6.00	8.00	7.78	13.00	12.57	4.3
M10	1.5	8.00	10.00	9.78	16.00	15.57	5.50
M12	1.75	10.00	12.00	11.73	18.00	17.57	6.60
M16	2.0	14.00	16.00	15.73	24.00	23.48	8.80
M20	2.5	17.00	20.00	19.67	30.00	29.48	10.70
M24	3.0	19.00	24.00	23.67	36.00	35.38	12.90

Countersunk Screws (Flat Head Screws)

The dimensions are generally in accordance with BS EN ISO 10642:1998.   This supersedes BS 4168-8.

Nominal size	Body Dia		Thread Pitch	Hex Socket Size	Max Cone Dia	Head Dia		Head Height	Soc. length
	D(max)	D(min)		J	A1	A_max	A_Min	H	K
M3	3.00	2.86	0.5	2,0	6,72	6,00	5,82	1,86	1,05
M4	4.00	3.82	0.70	2,5	8,96	8,00	7,78	2,48	1,49
M5	5.00	4.82	0.8	3,0	11,2	10,00	9,78	3,1	1,86
M6	6.00	5.82	1.0	4,0	13,44	12,00	11,75	3,72	2,16
M8	8.00	7.78	1.25	5,0	17,92	16,00	15,73	4,96	2,85
M10	10.00	9.78	1.5	6,0	22,4	20,00	19,67	6,2	3,60
M12	12.00	11.73	1.75	8,0	26,88	24,00	23,67	7,44	4,35
M16	16.00	15.73	2.0	10,0	33,6	32,00	29,67	8,8	4,89
M20	20.00	19.67	2.5	10,0	40,32	40,00	35,61	10,16	5,49

Sites Providing Information On Socket Screws

1. Dimensional Data - Socket Cap Screws..Holo-krome dimensional data
2. PTS_uk..Some useful dimensions of socket screws etc
3. Fullermetric.Din /ISO dimensions
4. Ondrives Goto Fasteners Lots of Information on metric screws