Jergens FW00002 Flat Washer 5/16 in Uss Sae Black Oxide

Product Description

The JERGENS FW00002 is a case-hardened steel flat washer sized for 5/16 inch screws, meeting both USS and SAE washer standards. It carries a black oxide finish that provides mild corrosion resistance and a uniform dark appearance. With a Rockwell C60 hardness rating, this washer is built to resist deformation under load in demanding fastening applications. Inside diameter measures 11/32 inches, outside diameter is 7/8 inches, and thickness is 9/64 inches. Licensed trades and maintenance professionals use it wherever a reliable, hardened flat washer is required for bolted or screwed connections in structural, mechanical, or equipment assemblies.

This washer is suited for general industrial, commercial, and maintenance applications where inch-series fasteners are specified. The dual USS and SAE designation means it meets the dimensional requirements of both washer series for the 5/16 inch screw size, giving it broad usability across a range of bolted joint assemblies. It is commonly installed in HVAC equipment mounting, electrical enclosure hardware, plumbing fixture brackets, and structural steel connections where a load-distributing washer is needed beneath a bolt head or nut.

Key Features

• Case-hardened steel construction rated at Rockwell C60 for high load resistance
• Black oxide finish for mild corrosion resistance and clean appearance
• Meets both USS and SAE flat washer standards for 5/16 inch screw size
• Inside diameter: 11/32 inches - Outside diameter: 7/8 inches - Thickness: 9/64 inches
• Inch-system dimensioning for direct use with standard SAE and USS fastener sets

Compatibility

Designed as an OEM-style and general-purpose replacement flat washer for use with 5/16 inch screws and bolts in inch-series fastener assemblies across industrial, commercial, and trade applications.

Installation Notes

Install using standard hand tools appropriate for the fastener being used. Power down or de-energize any equipment before accessing fastener hardware in electrical or mechanical enclosures. Ensure mating surfaces are clean and free of debris before seating the washer to achieve proper load distribution. This washer is intended for use by qualified tradespeople following applicable mechanical and structural codes for the installation type.