Dimensions of Square Head Bolts With Collar and Tip Approach

Dimensions	Thread d
	P	a1	c		dc		dp		k
		max	min	max	nominal=max	min	nominal=max	min	nominal	min	max
M 8	1.25	4	2.88	3.12	10	9.42	5.5	5.32	11	10.78	11.22
M 10	1.5	4.5	2.88	3.12	13	12.3	7	6.78	13	12.78	13.22
M 12	1.75	5.3	3.85	4.15	17	16.3	8.5	8.28	16	15.78	16.22
M 16	2	6	3.85	4.15	22	21.16	12	11.73	20	19.74	20.26
M 20	2.5	7.5	4.85	5.15	28	27.16	15	14.73	25	24.74	25.26
M 24	3	9	5.85	6.15	32	31	18	17.73	28	27.74	28.26

Dimensions	Thread d
	k'	r	s		z3		z4
	min	min	nominal=max	min	min	max	approx
M 8	5.5	0.4	8	7.78	2	2.25	1
M 10	6.9	0.4	10	9.78	2.5	2.75	1
M 12	8.3	0.6	13	12.73	3	3.25	1.25
M 16	11.1	0.6	17	16.73	4	4.3	1.75
M 20	13.8	0.8	22	21.67	5	5.3	2
M 24	15.2	0.8	24	23.67	6	6.3	2.5