1/4 Washer Dimensions & Size
Disclaimer: Washer dimensions and tolerances may vary by standard, manufacturer, material, or finish. Always confirm critical dimensions using the official product datasheet before installation.
| USS Standard | |||
|---|---|---|---|
| Dimensions | Nominal Size (in) | Actual Size (in) | |
| Min | Max | ||
| Inner Diameter | 5/16 | 0.307 | 0.327 |
| Outer Diameter | 3/4 | 0.727 | 0.749 |
| Thickness | Not specified | 0.051 | 0.080 |
| SAE Standard | |||
|---|---|---|---|
| Dimensions | Nominal Size (in) | Actual Size (in) | |
| Min | Max | ||
| Inner Diameter | 9/32 | 0.276 | 0.296 |
| Outer Diameter | 5/8 | 0.620 | 0.640 |
| Thickness | Not specified | 0.051 | 0.080 |
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. While SAE (Society of Automotive Engineers) washers are typically smaller and thinner, designed for more compact and tighter fit assemblies.
What size is a 1/4″ washer?
The size of a 1/4″ washer depends on the standard. Under the USS standard, it typically has a nominal inner diameter of 5/16″ and a nominal outer diameter of 3/4″. Under the SAE standard, it usually has a nominal inner diameter of 9/32″ and a nominal outer diameter of 5/8″.
What is the inner diameter of a 1/4″ washer?
The inner diameter is larger than the bolt size to allow clearance. It is typically 5/16″ for USS washers and 9/32″ for SAE washers.
What is the outer diameter of a 1/4″ washer?
The outer diameter varies by standard, with 3/4″ for USS washers and 5/8″ for SAE washers.
How thick is a 1/4″ washer?
Washer thickness varies by standard and manufacturer; however, 1/4″ washers typically range from 0.051 to 0.080 inch in thickness.
What does “1/4″” mean on a washer?
“1/4″” refers to the nominal bolt or screw size the washer is intended to fit, not the washer’s actual inner diameter.