DIN 137A Curved Spring Washers
M2 - M10
Spring steel
DIN 137A covers curved spring washers — a light spring element for small screws, giving flexible preload without the bulk of a coil washer. We supply DIN 137A washers across a range of metric sizes.
Also known as: curved washers, sprung washers.
DIN 137A dimensions
| Bolt Size | Inside Diameter | Outside Diameter | Height (max) | Thickness |
|---|---|---|---|---|
| M2 | 2.2mm | 4.5mm | 1mm | 0.3mm |
| M2.3 | 2.5mm | 5mm | 1mm | 0.3mm |
| M2.6 | 2.8mm | 5.5mm | 1.1mm | 0.3mm |
| M3 | 3.2mm | 6mm | 1.3mm | 0.4mm |
| M3.5 | 3.7mm | 7mm | 1.4mm | 0.4mm |
| M4 | 4.3mm | 8mm | 1.6mm | 0.5mm |
| M5 | 5.3mm | 10mm | 1.8mm | 0.5mm |
| M6 | 6.4mm | 11mm | 2.2mm | 0.5mm |
| M7 | 7.4mm | 12mm | 2.4mm | 0.5mm |
| M8 | 8.4mm | 15mm | 3.4mm | 0.5mm |
| M10 | 10.5mm | 18mm | 4mm | 0.8mm |
Materials & strength
Light flexible preload
The curved section applies gentle spring load, suiting small screws and anti-rattle duties.
Frequently asked
What is a DIN 137A washer?
A washer curved across its diameter so it flexes like a leaf spring when clamped, keeping light tension on small screwed joints and taking up play.
Need DIN 137A in a non-standard size or material?
Send us your drawing — specials quoted within 24 hours.