Gibraltar Z9103SS 1 in Flat Washer 18-8 Stainless Steel

Product Description

The GIBRALTAR Z9103SS is a standard flat washer designed for 1-inch screw sizes, manufactured from 18-8 stainless steel with a plain finish. It measures 1-1/32 inches inside diameter, 2 inches outside diameter, and 3/16 inches thick. The 18-8 stainless steel construction provides corrosion resistance suitable for both indoor and outdoor applications. Hardness is rated Rockwell C36-C42, giving this washer the load-bearing durability needed in demanding mechanical and structural assemblies. Licensed tradespeople and contractors install this washer as a load-distributing element under bolt heads or nuts to protect mating surfaces and prevent fastener pull-through.

This flat washer is used in a wide range of trade applications including HVAC equipment mounting, plumbing fixture installation, electrical enclosure assembly, and general mechanical fabrication. The stainless steel construction makes it appropriate for corrosive environments such as rooftop equipment installations, coastal locations, and wet mechanical rooms. It is sized for 1-inch fasteners per inch-system standards and is sold as a single unit, making it convenient for service calls requiring individual replacement hardware.

Key Features

• 18-8 stainless steel construction resists corrosion in wet and outdoor environments
• 1-1/32 inch inside diameter fits standard 1-inch fasteners with proper clearance
• 2-inch outside diameter distributes clamping load across a broad bearing surface
• 3/16 inch thickness provides rigidity under torque without deformation
• Rockwell C36-C42 hardness rating supports high-load mechanical assemblies
• Plain finish with no coating — suitable where coatings could contaminate or interfere

Compatibility

Designed as an OEM-style and aftermarket replacement standard flat washer for 1-inch screw size applications following inch-system fastener standards.

Installation Notes

Installation is performed by any licensed trade professional working with 1-inch fastener assemblies. Power down or de-energize any associated equipment before accessing fastener locations near electrical components. Use appropriate torque specs for the mating fastener grade and application — do not over-torque, as this can deform the washer seating surface. Ensure the washer is seated flush against the mating surface before final tightening.