Gibraltar 63608G M20 Flat Washer Case Hardened Steel

Product Description

The GIBRALTAR 63608G is a standard flat washer designed for use with M20 metric fasteners. Manufactured from case-hardened 1010 steel with a black oxide finish, this washer distributes clamp load across the bearing surface, reducing fastener pull-through and surface damage under torque. The hardened steel construction provides added resistance to deformation under load, making it suitable for structural and mechanical assembly applications where dimensional consistency is critical. Installation is performed by maintenance technicians, millwrights, and mechanical tradespeople working in industrial, commercial, or heavy equipment settings.

This washer is sized for M20 metric screws and bolts, with an inside diameter of 22 millimeters, an outside diameter of 44 millimeters, and a thickness of 5 millimeters. It is suited for use in metric fastening applications across industrial machinery, structural steel assemblies, and equipment maintenance where a hardened, corrosion-resistant washer is specified. The black oxide finish provides mild corrosion resistance and reduces light reflection in finished assemblies.

Key Features

• Case-hardened 1010 steel construction resists deformation under high clamp loads
• Black oxide finish provides mild corrosion resistance and a uniform appearance
• Standard flat washer profile for M20 metric fasteners
• 22 millimeter inside diameter fits M20 screw and bolt shanks
• 44 millimeter outside diameter distributes load across a wide bearing surface
• 5 millimeter thickness provides consistent standoff and load distribution

Compatibility

Designed for use with M20 metric screws and bolts in standard metric fastening applications.

Installation Notes

Installation requires no special tools beyond standard hand or power wrenches appropriate to the fastener being used. Ensure the washer is seated flat against the bearing surface before applying torque to the fastener. Follow applicable mechanical and structural assembly standards for the specific application. Inspect washers for deformation or cracking before reuse in critical assemblies.