Value Collection ZMSCH90208 O-ring Dash 208 Nitrile 50-pack

Product Description

The VALUE COLLECTION ZMSCH90208 is a Dash 208 Nitrile Butadiene Rubber (Buna-N) O-ring with a 0.625-inch inside diameter, 0.875-inch outside diameter, and a cross-section thickness of 0.125 inches. Rated at 90 durometer (extra hard), this O-ring delivers firm sealing pressure and strong resistance to compression set. The operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for systems that cycle through wide thermal swings. Licensed plumbers, HVAC technicians, and hydraulic system technicians commonly specify this seal for maintenance, repair, and OEM-style replacement work where petroleum-compatible elastomers are required.

Buna-N is the most widely used O-ring elastomer in the trades. The ZMSCH90208 is appropriate for use in hydraulic circuits, refrigerant service fittings, fuel handling components, pneumatic fittings, and general plumbing connections where the sealing surface contacts petroleum-based fluids or oils. The extra-hard 90-durometer compound resists extrusion under moderate to high pressure and holds its shape in high-vibration environments. This SKU ships in a package quantity of 50, suitable for stocking a service van or a shop parts bin.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products, fuels, and oils
• 90 durometer extra-hard rating reduces extrusion and maintains seal integrity under pressure
• Operating range of -40 degrees F to 250 degrees F covers most HVAC, plumbing, and hydraulic service conditions
• Round cross-section profile for standard O-ring grooves sized to Dash 208
• Strong tear and abrasion resistance extends service life in dynamic or high-cycle applications
• Meets SAE and MIL-Spec standards for dimensional and material compliance

Compatibility

Designed for use in any application requiring a Dash 208 O-ring in a petroleum-compatible elastomer, including hydraulic fittings, pneumatic connections, fuel system components, and plumbing service valves. Compatible material contact is limited to petroleum products; not recommended for exposure to ozone, direct sunlight during storage, or electrical equipment environments that generate ozone.

Installation Notes

Depressurize and isolate the system before removing the existing O-ring. Inspect the groove and mating surfaces for scoring or corrosion that could compromise the new seal. Apply a light coat of compatible lubricant to the O-ring before installation to ease seating and reduce the risk of twisting or nicking the elastomer. Follow applicable trade codes and the equipment manufacturer's torque specifications for fitting reassembly.