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DIN 7980:1987 Socket Head Cap Spring Washer

DIN 7980:1987 Spring Washer for socket head cap screws is used with cylindrical-head screws and similar fasteners. The split spring structure provides a degree of elastic reaction after tightening, helping improve loosening resistance in ordinary joints.

It is commonly applied in machinery, instrument assembly, electrical cabinets, maintenance joints, and small-to-medium screw assemblies. Its outside diameter and thickness are suited to the space beneath socket head cap screws and can function within limited counterbores or bearing seats.

Material and surface finish can be selected according to screw size, vibration level, and environmental conditions to improve rust resistance, elastic retention, and maintenance reliability of the connection.

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Dimensions unit: mm

Nominal diameter Φ3 Φ3.5 Φ4 Φ5 Φ6 Φ8 Φ10 Φ12 Φ14 Φ16
d Min. 3.1 3.6 4.1 5.1 6.1 8.1 10.2 12.2 14.2 16.2
Max. 3.4 3.9 4.4 5.4 6.5 8.5 10.7 12.7 14.7 17
h Nominal 1 1 1.2 1.6 1.6 2 2.5 2.5 3 3.5
Max. 1.1 1.1 1.3 1.7 1.7 2.1 2.65 2.65 3.2 3.7
Min. 0.9 0.9 1.1 1.5 1.5 1.9 2.35 2.35 2.8 3.3
n Nominal 1 1 1.2 1.6 1.6 2 2.5 2.5 3 3.5
Max. 1.1 1.1 1.3 1.7 1.7 2.1 2.65 2.65 3.2 3.7
Min. 0.9 0.9 1.1 1.5 1.5 1.9 2.35 2.35 2.8 3.3
H Min. 2 2 2.4 3.2 3.2 4 5 5 6 7
Max. 2.36 2.36 2.83 3.78 3.78 4.72 5.9 5.9 7.1 8.25
Applicable thread M3 M3.5 M4 M5 M6 M8 M10 M12 M14 M16
Weight per thousand pieces (steel)≈kg  0.105 0.114 0.195 0.37 0.425 1.06 1.96 2.28 3.8 5.94

   

Nominal diameter Φ18 Φ20 Φ22 Φ24 Φ27 Φ30 Φ33 Φ36 Φ42 Φ48
d Min. 18.2 20.2 22.5 24.5 27.5 30.5 33.5 36.5 42.5 49
Max. 19 21.2 23.5 25.5 28.5 31.7 34.7 37.7 43.7 50.5
h Nominal 3.5 4.5 4.5 5 5 6 6 7 8 8
Max. 3.7 4.7 4.7 5.2 5.2 6.2 6.2 7.25 8.25 8.25
Min. 3.3 4.3 4.3 4.8 4.8 5.8 5.8 6.75 7.75 7.75
n Nominal 3.5 4.5 4.5 5 5 6 6 7 8 8
Max. 3.7 4.7 4.7 5.2 5.2 6.2 6.2 7.25 8.25 8.25
Min. 3.3 4.3 4.3 4.8 4.8 5.8 5.8 6.75 7.75 7.75
H Min. 7 9 9 10 10 12 12 14 16 16
Max. 8.25 10.6 10.6 11.8 11.8 14.2 14.2 16.5 18.9 18.9
Applicable thread M18 M20 M22 M24 M27 M30 M33 M36 M42 M48
Weight per thousand pieces (steel)≈kg  6.6 12.3 13.6 18.1 20.6 32 35 52.5 80 90

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