Gibraltar Z9096SS Flat Washer 5/16 in 18-8 Stainless Steel

Product Description

The GIBRALTAR Z9096SS is a standard flat washer designed for use with 5/16-inch fasteners. Manufactured from Grade 18-8 stainless steel with a plain finish, this washer distributes load across a bearing surface to reduce fastener pull-through and protect the material beneath. It measures 11/32 inches inside diameter, 3/4 inches outside diameter, and 1/8 inch thick. The 18-8 stainless steel construction provides corrosion resistance in wet, humid, and mildly chemical environments, making it suitable for HVAC, plumbing, electrical, and pool equipment installations where exposed hardware must resist rust and oxidation.

This washer is used across a wide range of trade applications including residential and commercial HVAC equipment mounting, plumbing fixture installation, electrical panel and conduit work, and pool equipment assembly. Wherever a 5/16-inch bolt or screw requires a load-spreading interface between the fastener head or nut and a surface, this washer fits the role. Its stainless steel composition is particularly well-suited for outdoor, poolside, or high-humidity service environments where carbon steel hardware would corrode prematurely.

Key Features

• Grade 18-8 stainless steel construction for corrosion resistance in wet and humid environments
• Plain finish with no coating to add or flake, suitable for direct contact with mating surfaces
• Standard flat washer profile: 11/32 inches ID, 3/4 inches OD, 1/8 inch thick
• Fits 5/16-inch screw and bolt sizes used throughout HVAC, plumbing, and electrical trade work
• Rockwell hardness C36-C42 for reliable load distribution without deformation under typical fastening torque

Compatibility

Designed for use with 5/16-inch screws and bolts in standard inch-measurement fastener applications across HVAC, plumbing, electrical, and pool equipment installations.

Installation Notes

Install using standard hand tools appropriate for the mating fastener size. Power down or isolate any electrical, refrigerant, or pressurized system before working in the area where fasteners are being tightened or replaced. Follow applicable codes such as NEC or IPC for fastener requirements in regulated assemblies. Do not mix stainless steel washers with carbon steel fasteners in corrosive environments, as galvanic interaction may occur over time.