DIN 7980

DIN 7980 Spring lock washer for cylinder head screws Dimensions

Nominal	d1		d2	s		h		r	Mass (7,85 kg/dm3) per 1000units in kg	For thread size
	min.	max.	max.		Limit	min.	max.
3	3.1	3.4	5.6	1	±0.1	2	2.36	0.2	0.105	M3
3.5	3.6	3.9	6.1	1	±0.1	2	2.36	0.2	0.114	M3.5
4	4.1	4.4	7	1.2	±0.1	2.4	2.83	0.2	0.195	M4
5	5.1	5.4	8.8	1.6	±0.1	3.2	3.78	0.2	0.37	M5
6	6.1	6.5	9.9	1.6	±0.1	3.2	3.78	0.3	0.425	M6
8	8.1	8.5	12.7	2	±0.1	4	4.72	0.5	1.05	M8
10	10.2	10.7	16	2.5	±0.15	5	5.9	0.8	1.96	M10
12	12.2	12.7	18	2.5	±0.15	5	5.9	0.8	2.28	M12
14	14.2	14.7	21.1	3	±0.2	6	7.1	1	3.8	M14
16	16.2	17	24.4	3.5	±0.2	7	8.25	1	5.94	M16
18	18.2	19	26.4	3.5	±0.2	7	8.25	1	6.6	M18
20	20.2	21.2	30.6	4.5	±0.2	9	10.6	1	12.3	M20
22	22.5	23.5	32.9	4.5	±0.2	9	10.6	1	13.6	M22
24	24.5	25.5	35.9	5	±0.2	10	11.8	1.6	18.1	M24
27	27.5	28.5	38.9	5	±0.2	10	11.8	1.6	20.6	M27
30	30.5	31.7	44.1	6	±0.2	12	14.2	1.6	32	M30
33	33.5	34.7	47.1	6	±0.2	12	14.2	1.6	35	M33
36	36.5	37.7	52.2	7	±0.25	14	16.5	1.6	52.5	M36
42	42.5	43.7	60.2	8	±0.25	16	18.9	2	80	M42
48	49	50.5	67	8	±0.25	16	18.9	2	90	M48

DIN 7980 Spring Lock Washers Weights

Size	Weight
M3	0.105
M3.5	0.114
M4	0.195
M5	0.370
M6	0.425
M8	1.05
M10	1.96
M12	2.28
M14	3.80
M16	5.94
M18	6.60
M20	12.3
M22	13.6
M24	18.1
M27	20.6
M30	32
M33	35
M36	52.5
M42	80
M48	90

Weights are in kilograms per 1,000 pieces unless otherwise specified. All weights are approximations and strictly informative.