Washers, Brass

Matching the washer to a brass joint

The washer sits right under the head, so on visible brass hardware a mismatched steel washer is exactly the detail that spoils the look; a brass washer keeps the whole stack the same gold. Beyond appearance, a brass washer in an electrical joint keeps the conductive path consistent and adds bearing area at a terminal, and in a non-magnetic assembly it keeps the whole joint free of magnetic metal. The two styles do their normal jobs. A flat washer spreads the clamp load over a wider area and protects the surface under the head or nut, which matters on soft wood and finished surfaces where a brass screw is often used. A cup washer, or finishing washer, cradles a countersunk screw head in a neat recess, giving a clean seat and a decorative finish that suits the visible work brass is chosen for. Being soft, brass washers protect a finished surface gently rather than biting it. Matched to brass screws and nuts, they complete a joint that looks right, conducts, and stays non-magnetic.

Why choose brass washers

• Match brass fasteners for a consistent golden look
• Spread load and protect the surface under the head
• Conduct for electrical terminals and connections
• Cup washers finish countersunk brass screws neatly
• Non-magnetic for instruments and sensitive work

Common applications

• Completing visible brass fastener joints
• Under brass screw heads on finished surfaces
• Electrical terminals and connections
• Countersunk screw finishing (cup washers)
• Decorative and restoration hardware
• Non-magnetic assemblies

Brass Washer FAQs

Why use brass washers?

To match brass fasteners for a consistent golden look on visible joints, keep an electrical connection conductive, and stay non-magnetic. A steel washer under a brass head would break up the finish.

What is a cup washer for?

A cup, or finishing, washer cradles a countersunk screw head in a neat recess, giving a clean decorative seat and letting a countersunk brass screw finish without countersinking the material itself.

Do brass washers conduct?

Yes, brass conducts electricity, so brass washers suit terminals and electrical connections where a conductive, corrosion-resistant washer is wanted alongside brass hardware.

Which washer do I need?

A flat washer spreads load and protects the surface; a cup washer finishes a countersunk head. Choose by whether you need load spreading or a decorative countersunk seat.

Will a brass washer mark the surface?

Brass is soft, so it protects a finished surface gently rather than biting it, which suits the visible woodwork and hardware brass is chosen for.

Are these non-magnetic?

Yes, brass is non-magnetic, so the washers suit instruments and any assembly where magnetic hardware would interfere.