DIN 7980 Spring Lock Washer

DIN 7980 is a German standard defining requirements for spring lock washers: split metal rings designed to reinforce threaded joints. The washers have a square cross-section, except for the lightweight version DIN 7980 L, which has a rectangular shape. The range also includes N (normal), T (heavy), and OT (extra heavy) variants, allowing the fastener to be matched to specific loads. The direct equivalent of DIN 7980 is the domestic standard GOST 6402-70.

The main function of DIN 7980 spring lock washers is to prevent self-loosening of bolted and screwed joints operating under vibration, dynamic loads, or sharp pressure fluctuations. Their elastic properties maintain constant pressure on the fastener, minimizing the risk of deformation or joint failure.

Materials

Washers manufactured to the DIN 7980 standard use:

• Corrosion-resistant austenitic steels (A2, A4), which require no additional treatment due to their natural resistance to rust.
• Spring and alloy steels, which undergo electroplated zinc coating for protection against moisture and aggressive environments.

Applications

DIN 7980 spring lock washers ensure reliable fastening under significant loads and intensive use. They are used in:

• Mechanical engineering and machine tool manufacturing;
• Assembly of motor vehicles and agricultural machinery;
• Construction (installation of metal structures, equipment fastening).

Such washers are used in assemblies subject to shock loads or continuous vibration, as well as in aggressive environments.

Where to buy DIN 7980?

FLOK supplies DIN 7980 washers in small wholesale and large volumes, with delivery across Russia and CIS countries.

Dimension table for DIN 7980 spring lock washers, in mm

d	d₂	s	h
M3	5.6	1	2
M4	7	1.2	2.4
M5	8.8	1.6	3.2
M6	9.9	1.6	3.2
M8	12.7	2	4
M10	16	2.5	5
M12	18	2.5	5
M14	21.1	3	6
M16	24.4	3.5	7
M18	26.4	3.5	7
M20	30.6	4.5	9
M22	32.9	4.5	9
M24	35.9	5	10
M27	38.9	5	10
M30	44.1	6	12
M33	47.1	6	12
M36	52.2	7	14
M42	60.2	8	16
M48	67	8	16

Designations:

d - nominal thread diameter of the fasteners

d₂ - outer diameter of the washer

s - thickness

h - washer height in the free state