Dimensions for UNI 7689 Cross recessed raised countersunk head screws

Thread d	p	a	b	dk		f		r	rf	x	Cross Recess
											No.	Type H			Type Z
												m	penetration depth		m	penetration depth
		max	min	nom = max	min	approx	max	max	approx	max		approx.	min	max	approx	min	max
M1.6	0.35	0.7	15	3	2.75	0.4	0.96	0.4	3	0.9	0	1.9	0.74	1.1	1.8	0.89	1.14
M2	0.4	0.8	16	3.8	3.5	0.5	1.2	0.5	4	1	1	2.5	1.1	1.4	2.4	1.04	1.35
M2.5	0.45	0.9	18	4.7	4.4	0.6	1.5	0.7	5	1.1	1	2.7	1.3	1.6	2.8	1.5	1.75
M3	0.5	1	19	5.6	5.3	0.75	1.65	0.8	6	1.25	1	3.1	1.7	2	3.1	1.83	2.08
M3.5	0.8	1.2	20	6.5	6.14	0.9	1.93	0.95	7	1.5	2	4.2	1.74	2.24	4.3	1.93	2.39
M4	0.7	1.4	22	7.5	7.14	1	2.2	1	8	1.75	2	4.5	2.04	2.54	4.6	2.26	2.72
M5	0.8	1.6	25	9.2	8.84	1.25	2.5	1.3	10	2	2	5.3	2.77	3.27	5.3	2.89	3.35
M6	1	2	28	11	10.57	1.5	3	1.6	12	2.5	3	6.8	3.03	3.53	7	3.3	3.76
M8	1.25	2.5	34	14.5	14.07	2	4	2	16	3.2	4	9	4.18	4.68	8.8	4.06	4.52
M10	1.5	3	40	18	17.57	2.5	5	2.5	20	3.8	4	10	5.38	5.88	9.9	5.28	5.74