Bowmalloy KP80413 Sae Uss Flat Washer 5/16 Inch

Product Description

The BOWMALLOY KP80413 is a 5/16 inch screw-size SAE and USS flat washer made from Grade 9 carbon steel with a clear zinc chromate finish. It is used to distribute fastener load across a bearing surface, preventing pull-through and surface damage in bolted assemblies. The inside diameter measures 0.334 inches, the outside diameter measures 0.687 inches, and the thickness is 0.078 inches. This washer meets ASTM F436 standards and is suited for general mechanical, structural, and equipment assembly applications where corrosion resistance and dimensional consistency are required.

This flat washer is appropriate for use in residential and commercial trade applications including HVAC equipment assembly, plumbing fixture mounting, electrical panel and conduit support, and general structural fastening. The clear zinc chromate finish provides light corrosion protection, making it suitable for indoor and mildly protected outdoor installations. Electricians, plumbers, HVAC technicians, and general contractors will encounter this washer in standard bolted connections requiring SAE or USS washer dimensioning.

Key Features

• Meets ASTM F436 fastener standard for dimensional and material consistency
• Grade 9 carbon steel construction for reliable tensile strength
• Clear zinc chromate finish provides light corrosion resistance
• Dual SAE and USS classification for broad fitment across standard fastener applications
• Inside diameter of 0.334 inches fits 5/16 inch screws and bolts
• Thickness of 0.078 inches provides consistent load distribution without excessive stack height

Compatibility

Designed as a standard SAE and USS flat washer for use with 5/16 inch screw and bolt assemblies across general mechanical, structural, and trade applications.

Installation Notes

This washer is installed by placing it on the fastener shank between the bolt head or nut and the mating surface before torquing. Always select the correct washer size to match the nominal bolt diameter and the load requirements of the joint. Consult applicable codes such as the NEC or IPC when using fasteners in code-regulated installations. No special tools are required for washer placement, but ensure mating surfaces are clean and free of debris before assembly.