Simpson 5/8″ ASTM F844 USS Washer – Zinc Plated

The SimpsonWASHER5/8-ZP is a 5/8″ USS flat washer designed to meet ASTM F844 specifications. Constructed from durable steel with a corrosion-resistant zinc plating, this washer ensures solid load distribution under bolt heads or nuts, preventing damage to the surface material.

Ideal for use in wood, steel, and concrete applications, the wide outer diameter and flat profile help enhance bearing surface support in structural builds, utility installations, and heavy equipment mounting. Its bright zinc finish offers moderate corrosion protection, making it suitable for indoor or covered outdoor environments.

Features:

• 5/8″ inside diameter for use with compatible bolts and anchors
• Meets ASTM F844 for USS standard flat washers
• Zinc-plated for corrosion resistance in dry and covered settings
• Broad outer diameter helps distribute load and reduce embedment
• Commonly used in construction, steel framing, and foundation anchoring