Allstar Performance AN pattern flat washer sized for 5/16in fasteners. Made from stainless steel with a natural finish. Sold as a set of 25.
- Inside Diameter: 0.313 in
- Outside Diameter: 0.561 in
- Thickness: 0.055 in
- Material: Stainless Steel
- Finish: Natural
- Pack Quantity: 25
Spec Sheet: Allstar Spec Sheet
Compatibility
Compatible with 5/16in AN-pattern bolts and fasteners. AN washers have a smaller outside diameter than USS or SAE washers of the same nominal thread size, so do not substitute an AN washer where a USS or SAE spec washer is required.
FAQ
What size fastener does this washer fit?
This washer fits a 5/16in AN-pattern fastener, with an inside diameter of 0.313 in.
What is the outside diameter of this washer?
The outside diameter is 0.561 in, per the AN washer pattern.
What material is this washer made from?
This washer is made from stainless steel with a natural finish.
How many washers are included?
This listing includes a set of 25 washers.
Is this the same as a USS or SAE washer in this size?
No. AN, USS, and SAE washers in 5/16in each have a different outside diameter. This is an AN-pattern stainless washer; check the USS or SAE listing if that spec is required.

