Wave Washer
Washers · wave spring washer · wavy washer
Definition: A wave washer is a thin, wavy spring washer that provides light, repeatable preload in a compact space — common in bearing retention and PCB assemblies.
Anatomy & Schematic
■ Body■ Hole
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| for M4 | M4 | 0.35 OD | 0.006 thick |
| for M6 | M6 | 0.50 OD | 0.008 thick |
| for M10 | M10 | 0.79 OD | 0.012 thick |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Spring steel | spring steel | — | None |
| Stainless | spring stainless | — | None |
Materials
- Spring steel
- Spring stainless steel
- Phosphor bronze
Pros & Cons
Pros
- Very thin — fits where a coil spring cannot
- Predictable light preload
- Cheap in quantity
Cons
- Limited force and travel
- Flattens if over-compressed
- Precision of preload is low
Typical Uses
- Bearing preload
- Taking up axial play
- PCB and connector assemblies
- Light vibration damping
Alternatives & Related
- Belleville Washer — Higher, more controlled spring force
- Flat Washer — Load spreading with no spring action
Where to Buy
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FAQ
What is a wave washer used for?
Applying light axial preload to take up play — ball bearings, connectors, and printed-circuit assemblies.
Wave washer vs Belleville?
A wave washer gives a lighter, softer preload in a very thin profile; a Belleville gives higher force and more predictable load-deflection.