Value Collection ZMSCH70310 O-ring Dash 310 Nbr Pack of 50

Product Description

The VALUE COLLECTION ZMSCH70310 is a Dash 310 nitrile butadiene rubber (NBR) O-ring used to create leak-free seals in fluid and pneumatic systems. Measuring 0.5 inches inside diameter, 0.875 inches outside diameter, and 0.1875 inches thick, this round-cross-section O-ring is one of the most widely specified elastomer seals in the trade. It carries a Shore A hardness of 70 and resists petroleum-based fluids, making it a go-to choice for HVAC, plumbing, and hydraulic service work. Each package contains 50 rings.

This O-ring is suited for residential and light commercial applications wherever a Dash 310 seal is called out in service documentation. Typical install scenarios include refrigeration service valves, plumbing shut-off valves, hydraulic fittings, and fuel-system connections that contact petroleum products. The NBR compound provides excellent compression set resistance and strong tear and abrasion resistance across a broad service temperature range. Petroleum-compatible fluid circuits are the primary application. Avoid use in ozone-rich or UV-exposed environments without additional protection.

Key Features

• Dash 310 standard sizing: 0.5 inches ID, 0.875 inches OD, 0.1875 inches thick
• Nitrile butadiene rubber (NBR/Buna-N) compound with excellent petroleum fluid resistance
• Shore A hardness of 70 for reliable compression sealing under pressure
• Rated from -40 degrees F to 250 degrees F continuous service
• Round cross section for uniform seating in standard O-ring grooves
• Meets SAE and MIL-Spec standards

Compatibility

Designed as a standard Dash 310 O-ring replacement compatible with petroleum-based fluid systems including hydraulic circuits, refrigeration valves, and plumbing assemblies that specify NBR elastomer seals.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, and hydraulic service technicians depending on the application. Always depressurize and drain the system before replacing O-rings, and shut off all fluid supply valves. Lightly lubricate the O-ring with a compatible fluid or petroleum-based grease before seating to prevent tearing during assembly. Do not store unused O-rings in direct sunlight or near motors, generators, or other equipment that may produce ozone, as ozone degrades NBR compound over time.