Value Collection C613705 Copper Sealing Flat Washer 100 Pack

Product Description

The VALUE COLLECTION C613705 is a copper sealing flat washer sized for 3/8 inch screws. It provides a reliable seal and load-bearing surface under fastener heads in plumbing, hydraulic, and mechanical assemblies where leak prevention is required. The washer features a 0.375 inch inside diameter, a 0.5625 inch outside diameter, and a 0.0312 inch thickness. Copper construction offers natural corrosion resistance and soft conformability, allowing the washer to compress slightly against mating surfaces to form a fluid-tight seal. Sold in a 100-piece pack. Installers working on fluid lines or fittings that require a sealing washer will find this a straightforward drop-in component.

This washer is suited for use in low-pressure plumbing connections, hydraulic fittings, fuel line joints, and general mechanical assemblies where a soft metal sealing element is needed. The inch-dimensioned sizing makes it compatible with standard inch-series fasteners and fittings commonly found in residential and light commercial mechanical systems. Trade professionals including plumbers and HVAC technicians routinely use copper sealing washers at compression fittings, drain plugs, and banjo-style hydraulic connections.

Key Features

• Copper material provides corrosion resistance and soft-metal sealing compression
• Plain finish — no coating to interfere with sealing surface contact
• Inside diameter of 0.375 inches fits standard 3/8 inch screws and bolts
• Outside diameter of 0.5625 inches provides adequate bearing surface
• Thickness of 0.0312 inches allows controlled compression at mating surfaces
• 100-piece pack supports service truck stocking and maintenance applications

Compatibility

Designed as an OEM-style sealing washer for use with 3/8 inch inch-series fasteners in plumbing, hydraulic, and mechanical assembly applications requiring a soft copper sealing element.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or qualified mechanical tradespeople. Shut off and depressurize the fluid system before replacing sealing washers. Inspect mating surfaces for nicks or burrs that could prevent a proper seal. Copper sealing washers are typically single-use components and should be replaced rather than reused once compressed.