Gibraltar Z9270 Structural Flat Washer 1/4 in Alloy Steel

Product Description

The GIBRALTAR Z9270 is a structural flat washer designed for 1/4 inch screw applications in load-bearing fastener assemblies. Manufactured from alloy steel with a zinc yellow dichromate finish, it provides corrosion resistance in demanding service environments. The washer measures 9/32 inches inside diameter, 5/8 inches outside diameter, and 3/32 inches thick. Rockwell hardness in the C43-C49 range makes it suitable for high-strength bolted connections where a standard washer would deform under clamp load. Plumbers, electricians, HVAC technicians, and general contractors use structural washers when fastening structural members, equipment pads, or support brackets.

This washer is suited for residential and light commercial structural fastening tasks, including equipment mounting, beam connections, and support-frame assemblies. The zinc yellow dichromate coating resists oxidation in moderately exposed installations such as mechanical rooms, utility spaces, and outdoor equipment pads where hardware is subject to moisture. The inch-measurement system sizing makes it compatible with standard SAE and structural fastener hardware commonly stocked in trade supply.

Key Features

• Alloy steel construction with Rockwell C43-C49 hardness for high-strength bolted connections
• Zinc yellow dichromate finish for corrosion resistance in moderate-exposure environments
• 9/32 inches inside diameter fits 1/4 inch screw shank with proper clearance
• 5/8 inches outside diameter distributes clamp load across a broad bearing surface
• 3/32 inches thickness provides rigid load transfer without deformation under torque
• Inch-measurement sizing compatible with standard SAE structural fastener systems

Compatibility

Designed as an OEM-style structural flat washer for use with 1/4 inch screw and bolt fastener assemblies in structural and equipment-mounting applications.

Installation Notes

Structural flat washers are installed by qualified tradespeople following applicable building codes and fastener manufacturer torque specifications. Always de-energize and lock out any equipment before accessing fastener points on electrical or mechanical assemblies. Use the correct driver or wrench size to avoid damaging the washer seat or fastener head. Do not substitute a structural washer with a standard plain washer in high-load connections.