Gibraltar 42606G Flat Washer 5/8 in Case Hardened Steel

Product Description

The GIBRALTAR 42606G is a standard flat washer designed for use with 5/8-inch fasteners. Manufactured from case-hardened 1010 steel with a black oxide finish, this washer distributes load evenly across bolted joints and helps prevent surface damage under fastener heads and nuts. The black oxide finish provides moderate corrosion resistance and reduces light reflection in finished assemblies. With an inside diameter of 21/32 inches, an outside diameter of 1-3/8 inches, and a thickness of 1/8 inch, this washer meets standard dimensional requirements for general mechanical and structural fastening applications.

This flat washer suits a wide range of residential and commercial construction, mechanical assembly, and maintenance applications. It is commonly used by plumbers, HVAC technicians, electricians, and general contractors when securing pipe hangers, equipment mounting hardware, structural connections, and panel components. The case-hardened construction makes it appropriate for higher-load fastening points where a standard low-carbon washer may deform under tension.

Key Features

• 5/8-inch screw size with 21/32-inch inside diameter for proper fastener fit
• 1-3/8-inch outside diameter provides broad load distribution
• 1/8-inch thickness for rigidity under torque
• Case-hardened 1010 steel construction resists deformation under load
• Black oxide finish for moderate corrosion resistance and low-glare appearance
• Inch measurement system; UNSPSC code 31161807

Compatibility

Designed as a standard replacement flat washer for 5/8-inch fastener applications in general construction, mechanical assembly, and trade service work.

Installation Notes

Install between the fastener head or nut and the mating surface to distribute clamping load and protect the substrate. Ensure the washer seats flat with no tilt before applying torque. Follow applicable building, mechanical, or electrical code requirements for fastener assembly. No special tooling is required beyond a standard wrench or socket set sized for the fastener being used.