Gibraltar Z9204BR Extra Thick Flat Washer Brass 1/2 in

Product Description

The GIBRALTAR Z9204BR is an extra thick flat washer machined from solid brass with a plain (uncoated) finish. Designed for 1/2 inch screw sizes, it features a 17/32 inch inside diameter, a 1-1/8 inch outside diameter, and a 3/16 inch thickness — roughly twice the depth of a standard flat washer in this screw class. The added thickness provides greater load distribution and crush resistance under fastener heads or nuts, reducing the risk of material embedment in softer substrates. Brass construction resists corrosion in wet, marine, and chemical environments where zinc-plated or plain steel washers are unsuitable. Weighs 0.045 pounds per piece.

This washer is used across plumbing, electrical, HVAC, and general mechanical assembly wherever a 1/2 inch fastener requires extra bearing surface or added stack height. Common applications include pipe flange mounting, equipment panel fastening, and structural connections in corrosive or humid environments. The plain brass finish makes it suitable for use with brass, copper, or stainless fasteners without galvanic incompatibility concerns. Installers in marine, pool, and water treatment settings frequently specify brass hardware to meet corrosion-resistance requirements.

Key Features

• Extra thick at 3/16 inches (0.1875 inches) — provides greater load distribution than standard flat washers
• Brass material offers corrosion resistance in wet, marine, and chemical environments
• 17/32 inch (0.5312 inches) inside diameter fits 1/2 inch screw sizes with proper clearance
• 1-1/8 inch (1.1250 inches) outside diameter delivers wide bearing surface under fastener head or nut
• Plain finish — no coating to flake, crack, or introduce incompatible surface chemistry
• Inch measurement system; UNSPSC 31161807

Compatibility

Designed for use with 1/2 inch screw and bolt sizes in inch-measurement fastener assemblies. Suitable for brass, copper, and stainless fastener systems where corrosion resistance and extra bearing thickness are required.

Installation Notes

Install with the flat face seated squarely against the mating surface to ensure full bearing contact. Always verify inside diameter clearance against the actual fastener shank before final assembly. In plumbing or pool applications, confirm that all hardware in the joint is metallurgically compatible to prevent galvanic corrosion. No special tooling is required; standard hand tools apply.