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Material
Finish
Material Grade
System of Measurement
For Screw Size
OD
Thickness
Shape
Specs Met
Flat Washers

Flat Washers

The most common washer style, flat washers install between the fastened material's surface and a nut or bolt head to help distribute the load or reduce friction.

Standard

Zinc Plated Steel

Low Carbon

140HV

200HV

Galvanized Steel

Black Oxide Steel

Grade 5

Case Hardened

Plain Steel

Low Carbon

140HV

Blue Phosphate Alloy Steel

18-8 Stainless Steel

316 Stainless Steel

Brass

Nylon

Phenolic

Oversized

These washers are either thicker than standard for leveling or spacing, or they have a larger outer diameter to cover enlarged holes. Those with an oversized OD are also known as fender washers.

Zinc Plated Steel

Case Hardened

Through Hardened

Low Carbon

Galvanized Steel

Low Carbon

Black Oxide Steel

Through Hardened

Low Carbon

Plain Steel

Case Hardened

Low Carbon

18-8 Stainless Steel

316 Stainless Steel

Narrow

Fit these undersized washers into tight spaces where standard flat washers are too wide. They have narrow outside diameters so they work well on screw holes that are close to an edge or corner.

Zinc Plated Steel

Through Hardened

Low Carbon

Plain Steel

Low Carbon

18-8 Stainless Steel

316 Stainless Steel

Nylon

SAE

These tight-fitting SAE washers have a smaller outside diameter and thinner gauge than USS washers. Originally developed for automotive applications, they're now a common choice for everyday use.

Zinc Plated Steel

Through Hardened

Low Carbon

Plain Steel

Low Carbon

Zinc Flake Coated Steel

Through Hardened

18-8 Stainless Steel

316 Stainless Steel

Nylon

USS

USS washers have a larger outside diameter and thicker gauge than SAE washers for industrial use.

Zinc Plated Steel

Through Hardened

Low Carbon

Galvanized Steel

Low Carbon

Plain Steel

Low Carbon

Zinc Flake Coated Steel

Through Hardened

18-8 Stainless Steel

316 Stainless Steel

Military Specification

Demanding applications call for quality washers. This group includes washers that meet MS 15795 or AN 960 military specifications, or NAS 620 or NAS 1149 aerospace specifications.

Passivated 18-8 Stainless Steel

AN 960

MS 15795

NAS 620

NAS 1149

Square

Use a square washer to prevent rotation or in narrow applications where a round washer won't fit.

Galvanized Steel

Black Oxide Steel

18-8 Stainless Steel

Assortments

18-8 Stainless Steel

316 Stainless Steel

PTFE

Zinc Plated Steel