Stewart Fastener J37WUSSZ 3/8 in Uss Flat Washers Zinc 100pk

Product Description

The STEWART FASTENER J37WUSSZ is a jar of 100 zinc-plated USS flat washers sized for 3/8-inch fastener applications. USS flat washers feature a larger outer diameter than SAE washers, distributing load over a broader surface area to reduce pull-through and protect the mating material. The zinc plating provides basic corrosion resistance suitable for general indoor and light outdoor use. These washers are a standard hardware item used across mechanical, plumbing, HVAC, and electrical trade work wherever a 3/8-inch bolt or screw requires a bearing surface.

Suitable for residential and light commercial applications, these 3/8-inch USS flat washers are used under bolt heads and nuts to spread clamping load and prevent surface damage. The jar packaging keeps fasteners organized on the job site or in the shop. Common install scenarios include equipment mounting, conduit support, pipe hanger assemblies, and general structural bolting where a wider washer footprint is required compared to SAE-spec hardware.

Key Features

• USS specification outer diameter for wider load distribution than SAE washers
• Zinc plating for corrosion resistance in general-use environments
• 3/8-inch nominal size fits standard 3/8-inch bolts and threaded rod
• Jar of 100 units for convenient storage and dispensing on the job site
• Compatible with standard hex bolts, carriage bolts, and threaded fasteners

Compatibility

Designed as a general-purpose USS flat washer for use with 3/8-inch fasteners in standard mechanical, plumbing, HVAC, and electrical installation applications.

Installation Notes

USS flat washers are installed by placing the washer over the fastener shank before driving the nut or seating the bolt head against a surface. No special tools are required. Verify that the washer material and plating are appropriate for the environment, as zinc plating is not rated for submersion or highly corrosive conditions. Follow applicable codes such as NEC or IPC when using fasteners in electrical or plumbing assemblies.

Technical Specifications

• Nominal Size: 3/8 inches
• Washer Standard: USS
• Finish: Zinc
• Quantity per Package: 100
• UPC: 662352112147

Standard Information

• Brand: STEWART FASTENER
• Manufacturer Part Number: J37WUSSZ