Gibraltar Z8810 M10 Extra Thick Flat Washer Black Oxide

Product Description

The GIBRALTAR Z8810 is an extra thick flat washer engineered for M10 fastener applications requiring increased load distribution and surface protection. Manufactured from case-hardened 1010 steel with a black oxide finish, this metric washer resists corrosion and reduces surface marring under bolt heads and nuts. The extra thickness of 3 millimeters provides greater bearing surface rigidity compared to standard flat washers, making it well suited for structural and mechanical fastening work where thin washers would deform or allow pull-through. Installers in industrial maintenance, mechanical assembly, and construction trades rely on this type of washer when working with high-clamping-load fastener joints.

The Z8810 is used in metric fastener assemblies across a range of applications including equipment mounting, structural steel connections, conveyor systems, and general industrial machinery. The black oxide finish offers mild corrosion resistance in dry or lightly humid indoor environments. This washer fits M10 screws and bolts with a 10.5 millimeter inside diameter, making it compatible with standard M10 fastener shafts without modification.

Key Features

• Extra thick at 3 millimeters for increased load distribution and resistance to pull-through
• Case-hardened 1010 steel construction for hardness under high clamping loads
• Black oxide finish reduces corrosion and surface glare in indoor environments
• 10.5 millimeter inside diameter fits standard M10 fastener shafts
• 19 millimeter outside diameter provides wide bearing surface coverage
• Metric dimensioning for use in metric fastener systems and equipment

Compatibility

Designed as an OEM-style metric flat washer for use with M10 screws and bolts in standard metric fastener assemblies.

Installation Notes

Installation is performed by mechanics, millwrights, ironworkers, and general maintenance technicians working with metric fastener systems. Always de-energize and lock out equipment before disassembling fastened components. Washers should be seated flush against the mating surface with no overlap or misalignment before torquing the fastener. Do not substitute this washer in applications requiring hardened washers to specific grade standards without verifying material grade suitability for the load.