Jergens 31905 Standard Flat Washer 1/2 Inch Steel

Product Description

The JERGENS 31905 is a standard flat washer designed for use with 1/2 inch screws and bolts. Manufactured from 1010 steel with a plain finish, it distributes load across the fastener bearing surface to reduce the risk of pull-through and protect the mating material. The washer measures 17/32 inches inner diameter, 1 and 1/8 inches outer diameter, and 1/8 inch thick. It is a common hardware component installed by mechanics, ironworkers, plumbers, electricians, and general contractors across a wide range of structural and mechanical assemblies.

This flat washer is suited for residential and commercial construction, mechanical assemblies, HVAC equipment mounting, electrical panel installation, and general fastening applications where a standard inch-series washer is required. It conforms to inch-system dimensional standards and fits any application calling for a 1/2 inch screw size flat washer in plain steel.

Key Features

• Standard flat washer profile for 1/2 inch screw size fasteners
• 1010 steel construction for reliable strength in general-duty applications
• Plain finish suitable for interior use or further coating as needed
• 17/32 inch ID provides proper clearance for 1/2 inch fasteners
• 1 and 1/8 inch OD distributes clamp load across a broad bearing surface
• Inch-system dimensioning for compatibility with standard SAE hardware

Compatibility

Designed as a standard inch-series flat washer for use with 1/2 inch screw and bolt fasteners in general mechanical and construction applications.

Installation Notes

Install flat washers between the fastener head or nut and the mating surface to distribute clamping load and prevent surface damage. No special tools are required beyond standard wrenches or sockets. Ensure the washer seats flat against the bearing surface before torquing the fastener. Follow applicable building or mechanical codes for fastener assembly requirements in structural applications.