Dimensions for UNI 6105 Flat countersunk nib bolts with hexagon nut

Nominal size and thread diameter d	Pitch of thread p	Thread Length b			Diameter of Countersunk head dk		Diameter of unthreaded shank ds'		Width of nib g		i	Depth of head k	a
	Coarse pitch	Bolt ≤ 125	Bolt 125 - 200	Bolt ≥ 200	max	min	max	min	max	min	max	max	min	max
M 6	1.0	18	24	-	12.55	11.45	6	5.52	2.5	2.10	2.5	4.0	90°	95°
M 8	1.25	22	28	41	16.55	15.45	8	7.42	3.0	2.60	3.5	5.0	90°	95°
M 10	1.5	26	32	45	19.65	18.35	10	9.42	3.2	2.72	4.2	5.5	90°	95°
M 12	1.75	30	36	49	24.65	23.35	12	11.30	3.6	3.12	5.7	7.0	90°	95°
M 16	2.0	38	44	57	32.80	31.20	16	15.30	4.2	3.72	7.5	9.0	90°	95°
M 20	2.5	46	52	65	32.80	31.20	20	19.16	5.4	4.92	5.7	11.5	60°	65°
M 24	3.0	54	60	73	38.80	37.20	24	23.16	6.6	6.02	6.7	13.0	60°	65°