Gibraltar 42603G Standard Flat Washer 3/8 Inch Steel

Product Description

The GIBRALTAR 42603G is a standard flat washer designed for use with 3/8 inch screws and fasteners. Manufactured from case-hardened 1010 steel with a black oxide finish, this washer distributes load across a bearing surface to reduce fastener pull-through and protect mating materials. The black oxide coating provides a moderate level of corrosion resistance and reduces light reflection on finished assemblies. With an inside diameter of 13/32 inches, an outside diameter of 7/8 inches, and a thickness of 1/8 inch, this washer meets standard inch-series dimensional requirements for general mechanical and structural applications. Installation is straightforward and requires no special tooling.

This washer suits a broad range of general-purpose fastening tasks in mechanical, structural, and light industrial assemblies. It is commonly used in HVAC equipment mounting, plumbing fixture installation, electrical panel work, and general sheet metal fabrication where a standard inch-series washer is specified. The black oxide finish makes it appropriate for interior applications or environments where minimal surface treatment is acceptable. Trade professionals including HVAC technicians, plumbers, electricians, and general contractors will find this washer compatible with standard 3/8 inch fastener assemblies.

Key Features

• Case-hardened 1010 steel construction for strength and resistance to deformation under load
• Black oxide finish provides moderate corrosion resistance and low-glare appearance
• 13/32 inch inside diameter fits standard 3/8 inch screw shanks with proper clearance
• 7/8 inch outside diameter distributes clamp load over a broad bearing surface
• 1/8 inch thickness meets standard flat washer dimensional specifications for inch-series fasteners

Compatibility

Designed as a standard inch-series flat washer for use with 3/8 inch screws and bolts in general mechanical, structural, and trade-installation applications.

Installation Notes

Install with hand tools standard to the fastening application. Ensure mating surfaces are clean and free of debris before seating the washer. Power down or de-energize any equipment before servicing fastener connections in electrical or HVAC assemblies. Do not use black oxide finished fasteners or hardware in continuously wet or outdoor environments without additional corrosion protection.