Gibraltar 63623G M12 Standard Flat Washer Black Oxide

Product Description

The GIBRALTAR 63623G is an M12 standard flat washer manufactured from case-hardened 1010 steel with a black oxide finish. It is designed to distribute load under bolt heads and nuts in bolted assemblies, reducing surface damage and preventing loosening under vibration. The washer measures 13mm inside diameter, 29mm outside diameter, and 5mm thick. The black oxide finish provides mild corrosion resistance and reduces light reflection in exposed installations. This washer is a metric-series fastener component used by mechanical contractors, millwrights, HVAC installers, and general tradespeople in structural and equipment-mounting applications.

The 63623G is suited for use in residential and commercial mechanical installations where M12 fasteners are specified. Typical applications include equipment base mounting, duct support framing, pipe hanger assemblies, and general structural bolted connections that call for a metric standard flat washer. The case-hardened construction is appropriate for applications where the washer must resist embedding or deformation under sustained clamp load.

Key Features

• Case-hardened 1010 steel construction for resistance to deformation under clamp load
• Black oxide finish for mild corrosion resistance and reduced surface glare
• M12 screw size with 13mm inside diameter for accurate metric fastener fitment
• 5mm thickness provides consistent load distribution across the bearing surface
• 29mm outside diameter spreads clamp force over a broad contact area
• Metric measurement system for use in metric-specified assemblies

Compatibility

Designed as a standard flat washer for use with M12 metric fasteners in bolted assemblies conforming to metric fastener standards.

Installation Notes

Installation requires standard hand tools including the appropriate metric wrench or socket set. Ensure all equipment and systems are de-energized or de-pressurized before performing any bolted connections in live mechanical or electrical systems. Follow applicable torque specifications provided by the equipment manufacturer or governing installation code. Inspect washers for surface defects before installation and do not reuse washers that show signs of deformation or corrosion.