DIN 921 Specifications – Slotted Pan Head Screws With Large Head : Fuller Fasteners

Thread Size d		M1	M1.2	M1.4
P	Pitch	0.25	0.25	0.3
a	max	0.5	0.5	0.6
d_k	max=nominal size	3.5	4	4.5
d_k	min	3.2	3.7	4.2
k	Nominal Size	0.7	0.8	0.9
	max	0.82	0.92	1.02
	min	0.58	0.68	0.78
n	Nominal Size	0.25	0.3	0.3
	max	0.45	0.5	0.5
	min	0.31	0.36	0.36
t	max	0.5	0.55	0.6
t	min	0.35	0.4	0.45
c	≈	0.2	0.2	0.25
r	max	0.1	0.1	0.1

Thread Size d		M1.6	M2	M2.5
P	Pitch	0.35	0.4	0.45
a	max	0.7	0.8	0.9
d_k	max=nominal size	5	6	7
d_k	min	4.7	5.64	6.64
k	Nominal Size	1	1.2	1.5
	max	1.12	1.32	1.62
	min	0.88	1.08	1.38
n	Nominal Size	0.4	0.5	0.6
	max	0.6	0.7	0.8
	min	0.46	0.56	0.66
t	max	0.7	0.8	0.95
t	min	0.5	0.6	0.75
c	≈	0.25	0.3	0.4
r	max	0.1	0.1	0.1

Thread Size d		M3	M4	M5
P	Pitch	0.5	0.7	0.8
a	max	1	1.4	1.6
d_k	max=nominal size	8	12	16
d_k	min	7.64	11.57	15.57
k	Nominal Size	1.8	2.4	2.7
	max	1.92	2.52	2.82
	min	1.68	2.28	2.58
n	Nominal Size	0.8	1	1.2
	max	1	1.2	1.51
	min	0.86	1.06	1.26
t	max	1.15	1.5	1.6
t	min	0.9	1.2	1.3
c	≈	0.45	0.6	0.7
r	max	0.1	0.2	0.2

Thread Size d		M6	M8	M10
P	Pitch	1	1.25	1.5
a	max	2	2.5	3
d_k	max=nominal size	20	25	30
d_k	min	19.48	24.48	29.48
k	Nominal Size	3.1	3.8	4.6
	max	3.25	3.95	4.75
	min	2.95	3.65	4.45
n	Nominal Size	1.6	2	2.5
	max	1.91	2.31	2.81
	min	1.66	2.06	2.56
t	max	1.9	2.4	2.8
t	min	1.5	1.9	2.3
c	≈	0.8	0.9	1.1
r	max	0.25	0.4	0.4