Gibraltar Z8805 M5 Extra Thick Flat Washer Black Oxide

Product Description

The GIBRALTAR Z8805 is an extra thick flat washer designed for M5 screw applications. Manufactured from 1010 grade case-hardened steel with a black oxide finish, this metric washer provides increased load distribution and corrosion resistance compared to standard-thickness flat washers. With an inside diameter of 5.3 millimeters, an outside diameter of 11 millimeters, and a thickness of 2 millimeters, the Z8805 suits applications where added bearing surface and a finished appearance are required. It is appropriate for mechanical assemblies, fastener installations, and general industrial or trade use.

This washer is suited for use in residential and light commercial mechanical assemblies requiring metric hardware. The extra thickness provides added rigidity under bolt or screw head loads, making it a practical choice in HVAC equipment panels, electrical enclosures, plumbing bracket assemblies, and other trade applications where M5 fasteners are specified. The black oxide finish blends into dark-finished housings and offers mild surface protection in dry or low-moisture environments.

Key Features

• Extra thick profile at 2 millimeters for increased load distribution over standard flat washers
• 1010 grade case-hardened steel construction for hardness and wear resistance
• Black oxide finish for corrosion resistance and a consistent dark appearance
• Metric sizing: 5.3 millimeter ID, 11 millimeter OD, compatible with M5 fasteners
• UNSPSC Code 31161807 for procurement and catalog classification

Compatibility

Designed as an OEM-style replacement or supplemental flat washer for assemblies using M5 metric fasteners where an extra thick bearing surface is required.

Installation Notes

Installation is performed by any trade technician working with metric fastener assemblies. Power down or de-energize any equipment before accessing fastener points in electrical or HVAC panels. Use appropriate metric hand tools and torque wrenches sized for M5 hardware. Do not substitute this metric washer in imperial fastener applications without verifying dimensional compatibility.