Gibraltar Z9099M-SS Flat Washer 1/2 in 18-8 Stainless Steel

Product Description

The GIBRALTAR Z9099M-SS is a standard flat washer machined from 18-8 stainless steel, sized for 1/2 inch fasteners. It measures 17/32 inches inside diameter, 1-1/8 inches outside diameter, and 1/8 inch thick. The 18-8 stainless steel grade provides solid corrosion resistance in general-purpose and mildly corrosive environments, making it a reliable choice for mechanical assemblies across HVAC, plumbing, electrical, and general construction applications. Plumbers, HVAC technicians, and electricians routinely stock this washer as a standard hardware item for fastener installations requiring load distribution and surface protection.

This flat washer is suited for residential and commercial applications wherever a 1/2 inch fastener requires a larger bearing surface to distribute clamping load and prevent pull-through. Common install scenarios include equipment mounting, pipe hanger assemblies, ductwork fastening, and panel or bracket attachment. The inch measurement system makes it compatible with standard SAE fastener setups used throughout the trade industries.

Key Features

• 18-8 stainless steel construction for corrosion resistance in general-purpose environments
• 17/32 inch inside diameter fits standard 1/2 inch screws and bolts
• 1-1/8 inch outside diameter provides broad load distribution across the fastened surface
• 1/8 inch thickness for solid, consistent clamping support
• Standard washer type for straightforward drop-in replacement or new installation

Compatibility

Designed as a standard flat washer for use with 1/2 inch screws and bolts in inch-measurement fastener assemblies across HVAC, plumbing, electrical, and general mechanical applications.

Installation Notes

Installation requires no special tools beyond a wrench or socket appropriate for the mating fastener. Power down or de-energize any equipment before accessing fastener points in electrical or HVAC applications. Ensure the washer seats flush against the work surface before torquing the fastener to prevent uneven load distribution. Follow applicable codes — NEC, IPC, or IFGC as relevant — for fastener specifications within those systems.