Gibraltar Z9202SS Extra Thick Flat Washer 3/8 in Stainless

Product Description

The GIBRALTAR Z9202SS is an extra thick flat washer designed for 3/8 inch screw applications. Machined from Grade 18-8 stainless steel with a plain finish, this washer delivers corrosion resistance and mechanical strength in demanding fastener assemblies. It measures 13/32 inch inside diameter, 1 inch outside diameter, and 3/16 inch thick — dimensions that provide increased load-bearing surface area compared to standard flat washers. The elevated thickness also adds rigidity under torque, making it suitable for applications where fastener pull-through or surface marring is a concern. Installers across plumbing, HVAC, electrical, and general mechanical trades use hardware like this wherever stainless fasteners are specified.

This washer is appropriate for residential and commercial installations requiring corrosion-resistant hardware. Common applications include equipment mounting, pipe support assemblies, panel attachment, and any structural fastening where moisture exposure or chemical environments make carbon steel hardware unsuitable. The 18-8 stainless steel composition performs well in both indoor and outdoor service conditions.

Key Features

• Extra thick profile at 3/16 inch — greater than standard flat washer stock for improved load distribution
• Grade 18-8 stainless steel construction resists corrosion and oxidation
• 13/32 inch inside diameter fits 3/8 inch fasteners with appropriate clearance
• 1 inch outside diameter provides broad bearing surface to reduce fastener pull-through
• Plain finish with no coating — compatible with stainless fastener systems without galvanic conflict
• Hardness rated Rockwell C36-C42 for resistance to deformation under load

Compatibility

Designed for use with 3/8 inch screws and bolts in inch-measurement fastener systems. Suitable as a direct replacement or supplemental washer wherever an extra thick stainless flat washer of this diameter class is specified.

Installation Notes

Installation requires no specialized tooling beyond the fastener drive appropriate for the mating screw or bolt. Ensure the mating fastener is also stainless steel or a compatible alloy to avoid galvanic corrosion at the joint. Follow applicable mechanical or structural codes when used in load-bearing connections. Inspect the seating surface for burrs or debris before tightening to ensure full washer contact.