Gibraltar 42623G Standard Flat Washer 1/2 Inch Black Oxide

Product Description

The GIBRALTAR 42623G is a standard flat washer designed for use with 1/2 inch fasteners. It is manufactured from case-hardened 1010 steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces light glare in the field. The washer measures 17/32 inches inner diameter, 1-1/8 inches outer diameter, and 3/16 inches thick. This hardware is installed by HVAC technicians, plumbers, electricians, and general mechanical contractors wherever a load-distributing washer is needed under a bolt head or nut. Weighing approximately 0.05 pounds per piece, it is suited for both structural and equipment-mounting applications.

Standard flat washers of this type see wide use across residential and commercial construction, mechanical equipment installation, and trade service work. They distribute clamping load across the fastener contact surface, protecting softer substrates and improving joint integrity. The black oxide finish makes this washer a practical choice in applications where bare steel would be acceptable but light surface protection is preferred. It is sized to the inch measurement system and conforms to standard flat washer dimensional conventions for 1/2 inch screw sizes.

Key Features

• Case-hardened 1010 steel construction for reliable hardness and strength
• Black oxide finish provides light surface protection and reduced reflectivity
• 17/32 inches inner diameter sized for 1/2 inch fasteners
• 1-1/8 inches outer diameter for effective load distribution
• 3/16 inches thickness for consistent clamping under standard torque loads
• Inch measurement system for direct compatibility with standard SAE fasteners

Compatibility

Designed as a standard flat washer for use with 1/2 inch screws and bolts in inch-measurement fastener assemblies across mechanical, electrical, and plumbing installations.

Installation Notes

Install using standard hand tools; seat the washer flush against the mating surface before tightening the fastener. Power down or de-energize any equipment before accessing fastener locations on live systems. Black oxide finish does not provide heavy corrosion protection — avoid prolonged exposure to standing water or highly corrosive environments without additional protective measures. Follow applicable mechanical or structural codes for the specific assembly type.