Dimensions for UNI 6953 Slotted raised countersunk head tapping screws

Thread	p	a	dk		f	k	n			r	rf	t		y max
		max	nominal=max	min	approx	approx	nominal	min	max	max	approx	min	max	Type C	Type F
ST 2.2	0.8	0.8	4.3	4	0.7	1.3	0.66	0.66	0.8	0.8	3.8	0.95	1.15	2	1.6
ST 2.9	1.1	1.1	5.5	5.2	0.9	1.7	0.86	0.86	1	1.1	4.6	1.25	1.5	2.6	2.1
ST 3.5	1.3	1.3	6.8	6.44	1.2	2.1	1.06	1.06	1.2	1.4	5.4	1.55	1.9	3.2	2.5
ST 3.9	1.3	1.3	7.5	7.14	1.3	2.3	1.06	1.06	1.2	1.5	6	1.7	2.05	3.5	2.7
ST 4.2	1.4	1.4	8.1	7.74	1.4	2.5	1.26	1.26	1.51	1.6	6.6	1.85	2.25	3.7	2.8
ST 4.8	1.6	1.6	9.5	9.14	1.5	3	1.26	1.26	1.51	1.9	8.2	2.15	2.6	4.3	3.2
ST 5.5	1.8	1.8	10.8	10.37	1.7	3.4	1.66	1.66	1.91	2.1	9.4	2.42	2.95	5	3.6
ST 6.3	1.8	1.8	12.4	11.97	2	3.8	1.66	1.66	1.91	2.4	11.1	2.85	3.45	6	3.6