DIN 6918 Specifications – Square Taper Washers : Fuller Fasteners

For Nominal Thread Diameter		M12	M16	M20
d	min	13	17	21
d	max	13.43	17.43	21.52
a	Nominal Size	26	32	40
	min	24	29.5	37.5
	max	28	34.5	42.5
b	Nominal Size	30	36	44
	min	29.35	35.2	43.2
	max	30.65	36.8	44.8
c	min=nominal size	1.6	1.6	2
c	max	1.9	1.9	2.5
e^②		3.7	4.45	5.25
h	Nominal Size	4.9	5.9	7
	min	3.9	4.9	5.8
	max	5.9	6.9	8.2
r	≈	2	2.4	2.8
t	≈	0.7	0.8	0.9
per 1000 units ≈ kg		18.3	31.7	57.1

For Nominal Thread Diameter		M22	M24	M24 A
d	min	23	25	25
d	max	23.52	25.52	25.52
a	Nominal Size	44	56	56
	min	41.5	53	53
	max	46.5	59	59
b	Nominal Size	50	56	56
	min	49.2	55.05	55.05
	max	50.8	56.95	56.95
c	min=nominal size	2	2	2
c	max	2.5	2.5	2.5
e^②		6	6.26	6.25
h	Nominal Size	8	8.5	7.65
	min	6.8	7.3	6.45
	max	9.2	9.7	8.85
r	≈	3.2	3.2	3.88
t	≈	1	1	1
per 1000 units ≈ kg		82.8	129	128

For Nominal Thread Diameter		M27	M27 A	M30
d	min	28	28	31
d	max	28.52	28.52	32
a	Nominal Size	56	56	62
	min	53	53	59
	max	59	59	65
b	Nominal Size	56	56	62
	min	55.05	55.05	61.05
	max	56.95	56.95	62.95
c	min=nominal size	2.5	2.5	2.5
c	max	3	3	3
e^②		6.26	6.25	6.52
h	Nominal Size	8.5	7.65	9
	min	7.3	6.45	7.8
	max	9.7	8.85	10.2
r	≈	3.2	3.88	3.2
t	≈	1	1	1
per 1000 units ≈ kg		122	121	156

For Nominal Thread Diameter		M30 A	M36	M36 A
d	min	31	37	37
d	max	32	38	38
a	Nominal Size	62	68	68
	min	59	65	65
	max	65	71	71
b	Nominal Size	62	68	68
	min	61.05	67.05	67.05
	max	62.95	68.95	68.95
c	min=nominal size	2.5	3	3
c	max	3	3.5	3.5
e^②		6.5	6.68	7
h	Nominal Size	8.05	9.4	8.7
	min	6.85	8.2	7.5
	max	9.25	10.6	9.9
r	≈	3.96	3.2	4.24
t	≈	1	1	1
per 1000 units ≈ kg		155	182	191