Gibraltar Z9222 Extra Thick Flat Washer 3/4 in 18-8 Ss

Product Description

The GIBRALTAR Z9222 is an extra thick flat washer designed for 3/4 inch screw sizes, manufactured from Grade 18-8 stainless steel with a plain finish. At 7/32 inches thick, it provides greater load distribution and bearing surface than standard flat washers, reducing fastener pull-through and surface damage under high-clamp-load conditions. The 18-8 stainless steel construction delivers solid corrosion resistance in wet, outdoor, and mildly acidic environments. Licensed tradespeople and industrial maintenance technicians use this washer in structural, mechanical, and plumbing assemblies where additional washer thickness is required by design or code.

This washer is suited for residential and commercial applications where a 3/4 inch fastener requires a wider, thicker bearing surface. Typical installations include pipe flange bolting, equipment mounting, structural connections, and general mechanical assemblies across plumbing, HVAC, and electrical trade work. The plain finish is appropriate for applications where an uncoated stainless surface meets corrosion resistance requirements without additional coating.

Key Features

• Extra thick profile at 0.2188 inches (7/32 inches) for increased load distribution
• Grade 18-8 stainless steel construction for corrosion resistance in wet and outdoor environments
• 13/16 inch inside diameter fits standard 3/4 inch fastener shanks with appropriate clearance
• 1-1/2 inch outside diameter provides broad bearing surface to reduce pull-through risk
• Rockwell C36-C42 hardness rating for durability under high-clamp-load conditions
• Plain finish — no coating to flake, chip, or react with mating surfaces

Compatibility

Designed for use with 3/4 inch screws and bolts in inch-measurement fastener systems where an extra thick flat washer is specified.

Installation Notes

Install using standard hand tools appropriate for the fastener size and assembly type. Ensure the washer seat surface is clean and free of debris before torquing to prevent uneven load distribution. In plumbing or mechanical applications, follow applicable IPC or ASME standards for fastener torque and material compatibility. Do not mix stainless steel washers with carbon steel fasteners in environments where galvanic corrosion is a concern.