5/16 USS Flat Washers Box/100 40679

Overview

5/16 USS Flat Washers Box/100 (03827) is designed for load distribution in threaded fastener assemblies across general construction and industrial applications. Manufactured by Midwest Fastener, this box contains 100 pieces of USS-specification flat washers in a 5/16 inch thread size.

Technical Features

• USS specification with large outer diameter (7/8 in.): Provides a wider bearing surface compared to SAE washers, distributing clamping load over a greater area to reduce the risk of pull-through on softer or oversized holes.
• Steel construction with zinc finish: The zinc coating provides a corrosion-resistant barrier suitable for general-purpose indoor and light outdoor fastening applications.
• Grade 2 / A307 hardness rating: Meets standard hardness requirements for general structural and mechanical assembly use, ensuring consistent performance under expected fastener loads.
• 5/16 in. inner diameter: Precisely sized to seat correctly on 5/16 in. threaded fasteners such as bolts and screws without excessive play.
• Box quantity of 100 pieces: Packaged in a job-site-ready quantity suitable for contractors, maintenance crews, and assembly operations requiring consistent stock.

Applications

• General construction and structural bolting where load distribution across a joint surface is required.
• Mechanical assemblies using 5/16 in. bolts, screws, or other threaded fasteners.
• Applications where USS-standard large-body washers are specified over tighter-tolerance SAE washers.
• Light outdoor use where zinc-finish corrosion resistance is adequate for the exposure environment.