Value Collection ZMSCH70255 O-ring Dash 255 Nbr

Product Description

The VALUE COLLECTION ZMSCH70255 is a Dash 255 Nitrile Butadiene Rubber (NBR) O-ring designed for static and dynamic sealing applications in fluid and pneumatic systems. It measures 5.625 inches inside diameter, 5.875 inches outside diameter, and 0.125 inches thick with a round cross section. Hardness is rated at 70 Shore A, placing it in the hard range for reliable compression set resistance. Buna-N is the most widely used O-ring elastomer and offers strong resistance to petroleum-based fluids, making it a go-to choice for plumbing, HVAC, and hydraulic service professionals.

This O-ring is suited for use in residential and commercial plumbing, HVAC equipment, hydraulic assemblies, and fuel-handling systems where contact with petroleum products is expected. Its operating temperature range of -40 degrees F to 250 degrees F covers a broad range of service conditions. It is sold in packages of 10 and is installed by licensed plumbers, HVAC technicians, and hydraulic equipment service professionals.

Key Features

• Buna-N (NBR) elastomer provides excellent resistance to petroleum-based fluids and lubricants
• 70 Shore A hardness rating delivers strong compression set and tear resistance
• Round cross section, 0.125 inches thick, for consistent sealing across standard grooves
• Wide service temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Package quantity of 10 units per order

Compatibility

Designed as a standard Dash 255 O-ring replacement compatible with petroleum product environments. Should not be used in contact with ozone, direct sunlight exposure, or near motors and electrical equipment that generate ozone. Not FDA approved for food-contact applications.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or hydraulic service professionals. Always depressurize and drain the system before replacing O-rings. Inspect the mating groove for wear, burrs, or corrosion before seating the new ring. Avoid stretching the O-ring excessively during installation to prevent cross-section distortion and premature seal failure.