Gibraltar Z9205SS Extra Thick Flat Washer 5/8 in 18-8 Ss

Product Description

The GIBRALTAR Z9205SS is an extra thick flat washer designed for 5/8 inch screw applications requiring added load distribution and bearing surface. Manufactured from grade 18-8 stainless steel with a plain finish, this washer delivers corrosion resistance suited to both interior and exterior installations. The increased thickness of 3/16 inches sets it apart from standard flat washers, reducing fastener pull-through in softer substrates and providing a more stable clamping surface under heavy fastening loads. Hardness is rated at Rockwell C36 to C42. This washer is installed by plumbers, electricians, HVAC technicians, and general mechanical contractors wherever a reinforced fastening surface is required.

This washer is suited for residential and commercial mechanical, structural, and plumbing applications where a 5/8 inch fastener is used and a wider, thicker bearing surface is needed. The 18-8 stainless steel construction makes it appropriate for environments with moisture exposure, including outdoor equipment mounting, pipe hanger assemblies, and mechanical room installations. Sold individually, it fits into fastener inventories for field service and shop use alike.

Key Features

• Extra thick at 3/16 inches for increased load distribution over standard flat washers
• Grade 18-8 stainless steel construction for corrosion resistance in wet and outdoor environments
• Inside diameter of 21/32 inches fits 5/8 inch screw shanks with controlled clearance
• Outside diameter of 1-3/8 inches provides broad bearing surface to reduce fastener pull-through
• Plain finish with no coating that could flake, chip, or react with mating stainless hardware
• Rockwell C36 to C42 hardness rating for resistance to deformation under clamping load

Compatibility

Designed for use with 5/8 inch screws and bolts in standard inch-measurement fastener assemblies requiring an extra thick flat washer profile.

Installation Notes

Install using standard hand tools or torque wrenches appropriate to the fastener size and substrate material. Ensure mating fasteners are also stainless steel or a compatible alloy to avoid galvanic corrosion. Follow applicable mechanical or structural codes for fastener spacing and torque requirements. Inspect the washer seating surface for burrs or debris before assembly to ensure even load distribution.