Finishing Washer
Washers · cup washer · countersunk washer · finish washer
Definition: A finishing washer is a cupped washer with a countersunk recess that lets a flat-head screw sit flush, giving a clean finished look.
Anatomy
■ Body■ Hole
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| for #6 | M3.5 | — | — |
| for #8 | M4 | — | — |
| for #10 | M5 | — | — |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Zinc-plated steel | steel | — | None |
| Stainless / brass | varies | — | None |
Materials
- Zinc-plated steel
- Stainless steel
- Brass
Pros & Cons
Pros
- Neat flush screw finish
- Spreads load
- Hides the screw head recess
Cons
- Only fits flat-head screws
- More expensive than flat washers
- Not for structural loads
Typical Uses
- Cabinetry and furniture
- Mirrors and glass
- Paneling
- Decorative hardware
Alternatives & Related
- Flat Washer — General load spreading
- Bonded Sealing Washer — For sealing plus finishing
Where to Buy
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FAQ
What is a finishing washer?
A cupped washer that a flat-head screw seats into, so the screw sits flush and looks finished — common on furniture and decorative work.
When should I use a finishing washer?
Anywhere a visible flat-head screw should look clean — cabinets, mirrors, and trim — instead of a raw countersunk hole.