Curved (Crescent) Washer
Washers · crescent washer · curved spring washer · bowed washer
Definition: A curved washer is a slightly bowed disc that acts as a light spring, taking up play and keeping light assemblies snug.
Anatomy
■ Body■ Hole
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| for #4 | M3 | — | — |
| for #8 | M4 | — | — |
| for 1/4 | M6 | — | — |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Spring steel | spring steel | — | None |
| Stainless / phosphor bronze | varies | — | None |
Materials
- Spring steel
- Stainless steel
- Phosphor bronze
Pros & Cons
Pros
- Light spring force
- Takes up tolerance
- Cheap
Cons
- Low load capacity
- Flattens permanently if overloaded
- Not a true lock washer
Typical Uses
- Electronics
- Light assemblies
- Anti-rattle
- Bearing take-up
Alternatives & Related
- Wave Washer — Higher and more even spring force
- Belleville Washer — High, tunable spring force for heavy preload
- Split Lock Washer — For general anti-loosening
Where to Buy
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FAQ
What is a curved washer?
A slightly bowed spring disc that takes up play in light assemblies — electronics, bearings, and anti-rattle joints.
Curved vs wave washer?
A curved washer has one continuous bow; a wave washer has multiple waves for higher, more even spring force.