Stewart Fastener J3720WFZ 3/8x1-1/4 Zinc Fender Washers 100pk

Product Description

The STEWART FASTENER J3720WFZ is a jar of 100 zinc-plated fender washers sized 3/8 inch inner diameter by 1-1/4 inch outer diameter. Fender washers feature an oversized outer diameter relative to the bolt hole, distributing clamping load across a wider surface area. This reduces the risk of pull-through on thinner or softer materials. The zinc plating provides basic corrosion resistance suitable for general indoor and light-duty outdoor applications. These washers are sold as a single jar containing 100 pieces, making them practical for repetitive fastener work on job sites or in shop inventory.

These fender washers are used across a wide range of trade applications including HVAC equipment mounting, electrical panel and junction box work, plumbing support brackets, and general mechanical assembly. The 3/8 inch bolt clearance is one of the most common fastener sizes encountered in residential and light commercial construction and service work. The oversized 1-1/4 inch outer diameter makes them well suited for installations where the substrate requires broader load distribution, such as sheet metal, thin gauge brackets, or wood backing boards.

Key Features

• 3/8 inch inner diameter fits standard 3/8 inch bolts and threaded rod
• 1-1/4 inch outer diameter provides wide load distribution to minimize pull-through
• Zinc plating offers corrosion resistance for general-purpose use
• Jar of 100 pieces keeps fasteners organized and countable on the job
• Suitable for use across HVAC, plumbing, electrical, and general mechanical applications

Compatibility

Designed for use with 3/8 inch bolts, screws, and threaded rod in standard fastener assemblies across residential and light commercial trade applications.

Installation Notes

Fender washers are installed by any trade working with 3/8 inch fasteners. Place the washer on the bolt or screw before driving into the substrate to ensure full contact between the washer face and the work surface. Do not over-torque fasteners, as excessive clamping force can deform the washer and reduce load distribution effectiveness. Follow applicable mechanical or building code requirements for fastener spacing and load ratings on structural connections.

Technical Specifications

• Inner Diameter: 3/8 inch
• Outer Diameter: 1-1/4 inch
• Finish: Zinc Plated
• Quantity per Jar: 100 pieces
• UPC: 662352112598

Standard Information

• Brand: STEWART FASTENER
• Manufacturer Part Number: J3720WFZ