Tradepro tp-3/8flw Flat Washer 3/8 X 1 Inch 100 Pack

Product Description

The TRADEPRO tp-3/8flw is a 3/8 x 1 inch USS-standard flat washer with a zinc-plated finish, sold in a 100-piece pack. Flat washers distribute load across a fastener bearing surface, reducing the risk of pull-through and surface damage when fastening components together. The USS designation refers to the United States Standard sizing series, which specifies a larger outer diameter relative to the bolt size compared to SAE washers. These washers are thicker than fender washers, providing added rigidity under fastener loads. Licensed tradespeople across HVAC, plumbing, and electrical trades keep these on the truck for routine mechanical fastening tasks.

This washer is suited for general-purpose fastening applications in residential and light commercial construction and service work. Common uses include equipment mounting, panel securing, and structural connections where a 3/8 inch bolt or threaded rod is used. The zinc plating provides a basic level of corrosion resistance appropriate for indoor and sheltered outdoor installations. The 100-pack format supports bulk service work and reduces restocking frequency for high-volume fastening jobs.

Key Features

• USS standard sizing with a 3/8 inch inner diameter and 1 inch outer diameter
• Zinc-plated finish for basic corrosion resistance
• Thicker profile than fender washers for increased load-bearing rigidity
• 100-piece pack suitable for bulk trade use
• Compatible with standard 3/8 inch bolts, screws, and threaded rod

Compatibility

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

Installation Notes

Install using standard hand tools; seat the washer flush against the work surface before tightening the fastener to ensure even load distribution. Power down or de-energize any equipment before installing hardware near live electrical components. Follow applicable codes including NEC or IPC guidelines for fastener and mounting requirements specific to the trade application. Do not use zinc-plated washers in highly corrosive or submerged environments where stainless or galvanized hardware is required.

Technical Specifications

• Inner Diameter: 3/8 inches
• Outer Diameter: 1 inch
• Standard: USS
• Finish: Zinc Plated
• Quantity per Pack: 100

Standard Information

• Brand: TRADEPRO
• Manufacturer Part Number: tp-3/8flw