Dimensions UNI 6591 Tapping screws, slotted pan head

Thread	p	a	da	dk		k		n			r	rf	t	w	y
		max	max	max	min	max	min	nominal	max	min	min	approx	min.	min.	Type C	Type F
ST 2.2	0.8	0.8	2.8	4	3.7	1.3	1.1	0.5	0.7	0.56	0.1	0.6	0.5	0.5	2	1.6
ST 2.9	1.1	1.1	3.5	5.6	5.3	1.8	1.6	0.8	1	0.86	0.1	0.8	0.7	0.7	2.6	2.1
ST 3.5	1.3	1.3	4.1	7	6.6	2.1	1.9	1	1.2	1.06	0.1	1	0.8	0.8	3.2	2.5
ST 4.2	1.4	1.4	4.9	8	7.6	2.4	2.2	1.2	1.51	1.26	0.2	1.2	1	0.9	3.7	2.8
ST 4.8	1.6	1.6	5.5	9.5	9.1	3	2.7	1.2	1.51	1.26	0.2	1.5	1.2	1.2	4.3	3.2
ST 5.5	1.8	1.8	6.3	11	10.6	3.2	2.9	1.6	1.91	1.66	0.25	1.6	1.3	1.3	5	3.6
ST 6.3	1.8	1.8	7.1	12	11.6	3.6	3.3	1.6	1.91	1.66	0.25	1.8	1.4	1.4	6	3.6
ST 8	2.1	2.1	9.2	16	15.6	4.8	4.5	2	2.31	2.06	0.4	2.4	1.9	1.9	7.5	4.2
ST 9.5	2.1	2.1	10.7	20	19.5	6	5.7	2.5	2.81	2.56	0.4	3	2.4	2.4	8	4.2