Value Collection ZMSCH70353 O-ring Dash 353 Nbr 5 Pack

Product Description

The VALUE COLLECTION ZMSCH70353 is a Dash 353 Nitrile Butadiene Rubber (Buna-N) o-ring with a 5-inch inside diameter, 5.375-inch outside diameter, and a 3/16-inch (0.1875-inch) thick round cross section. Rated at 70 Shore A hardness, it seals against petroleum-based media and delivers reliable compression set resistance across a wide temperature range of -40 degrees F to 250 degrees F. This is one of the most broadly used elastomer compounds in fluid sealing applications. Sold in a package of 5. Licensed HVAC technicians, plumbers, and pipefitters commonly stock this size for routine maintenance and field repair work.

This o-ring is suited for use in static and low-speed dynamic sealing applications involving petroleum products, hydraulic fluids, and mineral-based oils. Its Buna-N compound provides strong resistance to fuels, lubricants, and many common industrial fluids. Typical install scenarios include pump housings, valve bodies, compressor ports, and pipe fittings in residential and commercial mechanical systems. The 70-durometer hardness rating makes it suitable for moderate-pressure sealing where a firm but compressible seal is required.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound — the most widely specified elastomer for petroleum-fluid sealing
• Dash 353 standard sizing: 5-inch ID, 5.375-inch OD, 3/16-inch cross section
• 70 Shore A durometer rated as Hard — resists extrusion under moderate pressure
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross section for consistent radial compression in grooved seats
• Meets SAE and MIL-Spec standards
• Package of 5 units per order

Compatibility

Compatible with petroleum products, mineral-based hydraulic fluids, and related fluids. Not FDA approved. Not recommended for ozone-generating environments, direct sunlight exposure, or proximity to motors and electrical equipment that produce ozone.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or pipefitter familiar with fluid sealing procedures. Shut off fluid supply and relieve system pressure before replacing any o-ring. Inspect the groove for burrs, corrosion, or damage that could cut or deform the seal. Avoid rolling or twisting the o-ring during installation; light lubrication with a compatible fluid is recommended to seat the ring without pinching.