Dimensions for DIN 7981 C Pan head tapping screws with cross recess H and Z, Form C

Thread size	p	a	dk		k		r	rf	cross recess	Type H			Type Z			Y max
										m	Penetration depth		m	Penetration depth
		max	nominal=max	min	nominal=max	min	max	approx	No.	approx	min	max	approx	min	max	Type C	Type F
ST 2.2	0.8	0.8	4.2	3.9	1.8	1.55	0.3	3.4	1	2.6	0.86	1.32	2.4	1.1	1.35	2	1.6
ST 2.9	1.1	1.1	5.6	5.3	2.2	1.95	0.4	4.4	1	3	1.35	1.8	2.9	1.58	1.83	2.6	2.1
ST 3.5	1.3	1.3	6.9	6.54	2.6	2.35	0.5	5.4	2	4.2	1.4	2.03	3.9	1.47	1.93	3.2	2.5
ST 3.9	1.3	1.3	7.5	7.14	2.8	2.55	0.5	5.8	2	4.4	1.63	2.26	4.1	1.7	2.16	3.5	2.7
ST 4.2	1.4	1.4	8.2	7.84	3.05	2.75	0.6	6.2	2	4.6	1.8	2.46	4.3	1.88	2.34	3.7	2.8
ST 4.8	1.6	1.6	9.5	9.14	3.55	3.25	0.7	7.2	2	5	2.26	2.87	4.7	2.28	2.74	4.3	3.2
ST 5.5	1.8	1.8	10.8	10.37	3.95	3.65	0.8	8.2	3	6.5	2.49	3.15	6.2	2.51	2.97	5	3.6
ST 6.3	1.8	1.8	12.5	12.07	4.55	4.25	0.9	9.5	3	7.1	3	3.66	6.7	3.02	3.48	6	3.6