Gibraltar 42602G Standard Flat Washer 5/16 in Case Hardened Steel

Product Description

The GIBRALTAR 42602G is a standard flat washer designed for use with 5/16 inch screws and fasteners. Manufactured from 1010 case-hardened steel with a black oxide finish, this washer distributes load across the bearing surface and helps protect fastened assemblies from loosening and surface damage. The black oxide coating provides a degree of corrosion resistance and reduces light reflection in finished assemblies. With an inside diameter of 11/32 inches, an outside diameter of 3/4 inches, and a thickness of 1/8 inch, this washer conforms to standard inch-series flat washer dimensions. It is installed by electricians, plumbers, HVAC technicians, and general trade mechanics wherever a 5/16 inch fastener requires a load-spreading seat.

This washer is suited for general industrial, mechanical, and trade applications where a standard 5/16 inch screw or bolt is used. Typical installations include equipment mounting, panel fastening, pipe support hardware, and structural assembly work across residential and light commercial projects. The case-hardened 1010 steel construction makes it appropriate for use in moderate-load applications where a hardened bearing surface under a fastener head or nut is required. Sold individually; minimum order quantity is 10 units.

Key Features

• Case-hardened 1010 steel construction provides a firm bearing surface under fastener heads and nuts
• Black oxide finish offers mild corrosion resistance and a uniform dark appearance
• Standard inch-series dimensions: 11/32 inches ID, 3/4 inches OD, 1/8 inch thick
• Sized for 5/16 inch screws and bolts
• Lightweight at 0.01 pounds per washer

Compatibility

Designed as an OEM-style standard flat washer for use with 5/16 inch inch-series screws and bolts in general trade and mechanical assembly applications.

Installation Notes

Install by placing the washer flat against the mating surface before seating the fastener head or nut. Ensure the inside diameter seats freely over the fastener shank without binding. Standard hand tools apply. Follow applicable mechanical codes and fastener torque guidelines for the specific assembly being serviced.