DIN 7980 Square Section Spring Washers
DIN 7980 covers single coil spring lock washers — the square-section pattern, used under a nut or bolt head to resist loosening. We supply square section spring washers across a range of metric sizes.
Also known as: square section spring washers, single coil spring washers.
DIN 7980 dimensions
| Bolt Size | Inside Diameter | Outside Diameter | Thickness |
|---|---|---|---|
| M3 | 3.1mm | 5.60mm | 1.0mm |
| M4 | 4.1mm | 7.0mm | 1.2mm |
| M5 | 5.1mm | 8.8mm | 1.6mm |
| M6 | 6.1mm | 9.9mm | 1.6mm |
| M8 | 8.1mm | 12.7mm | 2.0mm |
| M10 | 10.2mm | 16.0mm | 2.5mm |
| M12 | 12.2mm | 18.0mm | 2.5mm |
| M16 | 16.2mm | 27.4mm | 3.5mm |
| M20 | 20.2mm | 33.6mm | 4.0mm |
Materials & strength
Single coil spring action
The helical coil flattens under load and maintains tension in the joint.
What is a square section spring washer?
A single coil helical spring washer whose wire section is square. Under load the coil flattens and its spring action maintains tension in the joint, helping resist loosening.
Square or rectangular section - which do I need?
Both work the same way; the difference is the wire section. If your drawing names DIN 127 form A or B, or BS 4464, match the pattern specified - dimensions differ between them.
Need DIN 7980 in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.