Gibraltar Z9274 Structural Flat Washer 1/2 in Alloy Steel

Product Description

The GIBRALTAR Z9274 is a structural flat washer designed for high-load bolted connections in construction and industrial applications. Built from alloy steel with a zinc yellow dichromate finish, this washer provides corrosion resistance while meeting the dimensional requirements of structural assemblies. It carries a Rockwell C43-C49 hardness rating, making it suitable for use in joints where load distribution and fastener integrity are critical. The 1/2 inch screw size, 17/32 inch inside diameter, and 1-1/16 inch outside diameter make it a standard fit for structural bolting work performed by ironworkers, millwrights, and general contractors.

This washer is used in structural steel connections, equipment mounting, and heavy-duty mechanical assemblies where a standard flat washer does not provide sufficient bearing surface. The zinc yellow dichromate finish offers moderate corrosion protection, making it appropriate for interior structural work and sheltered exterior applications. It is sold individually per package with a minimum order quantity of 5 pieces.

Key Features

• Alloy steel construction with Rockwell C43-C49 hardness for high-strength structural use
• Zinc yellow dichromate finish provides corrosion resistance
• 17/32 inch inside diameter fits 1/2 inch fasteners with standard clearance
• 1-1/16 inch outside diameter distributes load across a broad bearing surface
• 13/64 inch thickness (0.2031 inches) meets structural washer dimensional standards

Compatibility

Designed as a structural flat washer for use with 1/2 inch screw and bolt fasteners in structural steel and heavy-duty mechanical assemblies.

Installation Notes

Install using standard hand and impact tools appropriate for the fastener type and torque specification required by the joint design. Power down or de-energize any associated equipment before working in the assembly area. Follow applicable structural codes and project specifications for washer placement and fastener torque. Do not substitute this washer in applications requiring hardened or load-indicating washer standards unless confirmed by a qualified engineer.