#10 Washer Dimensions & Size

#10 washers are commonly used with #10 bolt or machine screws in light-to-medium duty fastening applications such as electrical enclosures, HVAC assemblies, cabinetry, sheet metal work, and general hardware installations. They are designed to distribute load, protect contact surfaces, and improve fastening stability. Under the SAE standard, a #10 plain washer typically has a nominal inner diameter of 7/32” and a nominal outer diameter of 1/2”. Thickness generally ranges from 0.036 to 0.065 inch. All dimensions shown are based on SAE standards.

Disclaimer: Washer dimensions and tolerances may vary by standard, manufacturer, material, or finish. Always confirm critical dimensions using the official product datasheet before installation.

Washer Diagram Anatomy
SAE Standard
Dimensions Nominal Size (in) Actual Size (in)
Min Max
Inner Diameter 7/32 0.214 0.227
Outer Diameter 1/2 0.495 0.515
Thickness Not specified 0.036 0.065
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Frequently Asked Questions

What is the difference between USS and SAE washer standards?

USS (United States Standard) washers generally have a larger outer diameter and thicker profile, making them suitable for structural and general-purpose applications. SAE (Society of Automotive Engineers) washers are typically smaller and thinner, designed for compact assemblies and machine screw applications.

What size is a #10 washer?

A #10 washer is designed to fit #10 screws. Under the SAE standard, it typically has a nominal inner diameter of 7/32″ and a nominal outer diameter of 1/2″.

What is the inner diameter of a #10 washer?

The inner diameter of a #10 SAE washer is typically 7/32″, allowing proper clearance for a #10 machine screw.

What is the outer diameter of a #10 washer?

The outer diameter of a #10 SAE washer is usually 1/2″.

How thick is a #10 washer?

#10 SAE washers typically have a thickness ranging from 0.036 to 0.065 inch, depending on manufacturer and material.