Dimensions for UNI 7688 Cross recessed countersunk flat head screws

Thread d	p	a	b	dk		k	r	x	Cross Recess
									no	type H			type Z
										m	penetration depth		m	penetration depth
		max	min	nominal = max	min	max	max	max		approx	min	max	approx	min	max
M1.6	0.35	0.7	15	3	2.75	0.96	0.4	0.9	0	1.7	0.66	0.91	1.8	0.89	1.14
M2	0.4	0.8	16	3.8	3.5	1.2	0.5	1	1	2.35	0.95	1.25	2.2	0.92	1.17
M2.5	0.45	0.9	18	4.7	4.4	1.5	0.7	1.1	1	2.7	1.25	1.55	2.5	1.22	1.47
M3	0.5	1	19	5.6	5.3	1.65	0.8	1.25	1	2.9	1.5	1.8	2.8	1.48	1.73
(M3.5)	0.8	1.2	20	6.5	6.14	1.93	0.95	1.5	2	3.9	1.4	1.9	3.7	1.34	1.8
M4	0.7	1.4	22	7.5	7.14	2.2	1	1.75	2	4.4	1.9	2.4	4	1.6	2.06
M5	0.8	1.6	25	9.2	8.84	2.5	1.3	2	2	4.6	2.1	2.6	4.4	2.05	2.51
M6	1	2	28	11	10.57	3	1.6	2.5	3	6.6	2.8	3.3	6.1	2.46	2.92
M8	1.25	2.5	34	14.5	14.07	4	2	3.2	4	8.7	3.9	4.4	8.5	3.86	4.32
M10	1.5	3	40	18	17.57	5	2.5	3.8	4	9.6	4.8	5.3	9.4	4.77	5.23