Gibraltar Z9283 Structural Flat Washer 1-1/2 in Alloy Steel

Product Description

The GIBRALTAR Z9283 is a structural flat washer designed for use with 1-1/2 inch screws and bolts in heavy-duty fastening applications. Manufactured from alloy steel with a zinc yellow dichromate finish, this washer provides corrosion resistance and a hardness rating of Rockwell C43 to C49, making it suitable for high-load structural connections. The 1-9/16 inch inside diameter, 3 inch outside diameter, and 1/4 inch thickness conform to standard structural washer geometry. Licensed trades and contractors working with structural steel assemblies will find this washer meets the dimensional and hardness requirements typical of load-bearing connections.

This washer is used in structural steel framing, heavy equipment mounting, and industrial fastening assemblies where standard flat washers do not provide sufficient load distribution. The large outside diameter spreads clamping force across a wider bearing surface, reducing the risk of fastener pull-through under high tension. It is appropriate for both new construction and retrofit applications in commercial and industrial settings where alloy steel hardware is specified.

Key Features

• Alloy steel construction with Rockwell C43-C49 hardness for high-load structural use
• Zinc yellow dichromate finish provides corrosion resistance
• 1-9/16 inch inside diameter fits 1-1/2 inch nominal screw or bolt size
• 3 inch outside diameter distributes clamping load over a wide bearing surface
• 1/4 inch thickness meets structural washer geometry requirements
• Inch measurement system; compatible with standard SAE fastener sizing

Compatibility

Designed as an OEM-style structural flat washer for use with 1-1/2 inch nominal screw and bolt sizes in alloy steel fastening applications.

Installation Notes

Installation is typically performed by ironworkers, structural contractors, or licensed mechanical trades working under applicable building codes. Always de-energize or depressurize any associated system before accessing structural connection points. Use calibrated torque equipment when final tightening to engineered specifications is required. Inspect washer seating and finish condition before installation to ensure full bearing contact.