Gibraltar Z8864 M24 Extra Thick Flat Washer Black Oxide

Product Description

The GIBRALTAR Z8864 is an extra thick flat washer designed for M24 screw applications requiring a higher load-bearing surface and greater resistance to embedment than standard washers provide. Manufactured from 1010 case-hardened steel, the washer delivers a hard outer shell with a tough core, making it suitable for high-clamp-load fastening assemblies. A black oxide finish provides mild corrosion resistance and reduces light reflection. With a 25 mm inside diameter, 43 mm outside diameter, and 6.5 mm thickness, this washer is built to distribute fastener load across a wider surface area in structural and mechanical assemblies. It is installed by maintenance mechanics, millwrights, and industrial tradespeople working with M24 metric fastener systems.

This washer fits M24 metric bolts and screws and is used in structural connections, heavy equipment assembly, and industrial machinery where standard-thickness washers are insufficient. The extra thick profile is particularly useful in applications involving softer base materials or where vibration resistance demands a larger bearing surface. Its metric dimensions conform to common international fastener standards, making it a practical fit for equipment manufactured to metric specifications across a range of industries including construction, manufacturing, and material handling.

Key Features

• Extra thick 6.5 mm profile distributes clamp load across a wider bearing surface than standard flat washers
• Case-hardened 1010 steel construction provides a hard surface with a tough, impact-resistant core
• Black oxide finish offers mild corrosion resistance and a low-reflectance appearance
• 25 mm inside diameter sized for M24 metric fasteners
• 43 mm outside diameter for broad load distribution on the mating surface

Compatibility

Designed for use with M24 metric screws and bolts in structural, industrial, and mechanical fastening applications requiring an extra thick flat washer.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance tradespeople familiar with metric fastener assemblies. Ensure the mating surfaces are clean and free of debris before seating the washer. Follow the torque specifications provided by the equipment manufacturer or applicable structural standards for M24 fasteners. Do not substitute this washer in applications requiring hardened washers to a specific standard unless the material grade and dimensions have been verified against those requirements.