Bowmalloy BOW500011 Uss Flat Washer 1-1/4 in Steel 10pk

Product Description

The BOWMALLOY BOW500011 is a USS flat washer designed for heavy-duty fastening applications where load distribution and surface protection are critical. Made from steel with a Bowma-Guard finish, this washer meets ASTM F436 standards and carries a Rockwell C38-42 hardness rating, making it well suited for structural and industrial fastening work. It fits a 1-1/4 inch screw size and ships in a package of 10 units. Plumbers, pipefitters, structural tradespeople, and general contractors rely on this type of washer to spread clamping load and protect mating surfaces under bolted connections.

This washer is used in residential and commercial construction, mechanical installations, and structural assembly wherever a 1-1/4 inch fastener requires a wide bearing surface. The USS pattern provides a larger outer diameter relative to the screw size compared to SAE washers, giving it better load distribution on softer or oversized holes. The Bowma-Guard finish provides corrosion resistance for use in demanding environments.

Key Features

• ASTM F436 fastener standard compliance for structural applications
• Rockwell C38-42 hardness for high-load bearing performance
• Bowma-Guard finish provides corrosion resistance
• USS pattern delivers wider outer diameter for improved load distribution
• Inside diameter of 1.375 inches fits 1-1/4 inch screw sizes
• Package quantity of 10 units per order

Compatibility

Designed as an OEM-style replacement or standard USS flat washer for use with 1-1/4 inch fasteners in structural, mechanical, and general construction applications.

Installation Notes

Installation is performed by qualified tradespeople including pipefitters, ironworkers, and general contractors. Always de-energize or shut off any systems before accessing fastener connections in live mechanical or electrical assemblies. Use appropriate torque equipment per the applicable project specification or structural drawing. Verify fastener and washer material compatibility when working in corrosive or dissimilar-metal environments.