Bowmalloy BOW500001 Uss Flat Washer 5/16 in Steel 100pk

Product Description

The BOWMALLOY BOW500001 is a USS flat washer designed for load distribution in bolted and screwed fastener assemblies. Made from Grade 9 steel with a Bowma-Guard finish, it delivers corrosion resistance suited for demanding industrial and mechanical applications. The washer seats on a 5/16 inch screw, with an inside diameter of 0.334 inches and an outside diameter of 0.875 inches. Thickness runs 0.086 inches, placing it firmly in the standard USS dimensional profile. Hardness is rated Rockwell C38-42, making it appropriate for high-load clamping applications. These are packaged in quantities of 100 per pack, sized for recurring maintenance and production use.

This washer is used wherever a 5/16 inch fastener requires a wider bearing surface to spread clamp load, prevent pull-through, or protect softer substrate materials. Common install scenarios include structural connections, mechanical equipment mounting, HVAC equipment frames, and general trade assembly work. The USS profile provides a larger outer diameter than SAE equivalents at the same screw size, making it the preferred choice when working with oversized holes or softer materials requiring broader load contact.

Key Features

• Grade 9 steel construction for high hardness and load capacity
• Bowma-Guard finish for enhanced corrosion protection
• Rockwell C38-42 hardness rating for demanding clamping applications
• USS standard profile with 0.875 inch OD for broad load distribution
• Meets ASTM F436 fastener standard
• Packaged 100 per pack for bench stock and production use

Compatibility

Designed as a USS-profile replacement washer for 5/16 inch screw fastener assemblies in inch-measurement systems where ASTM F436 compliance is required.

Installation Notes

Installation is performed by general mechanics, millwrights, HVAC technicians, and plumbers as part of standard bolted assembly work. Always verify the mating screw or bolt grade is compatible with the washer hardness before assembly. Inspect the seating surface for burrs or debris that could compromise clamp load. Do not substitute USS washers for SAE washers in applications where dimensional tolerances are critical without confirming fitment.