Value Collection ZMSCH70444 O-ring Dash 444 Nitrile 70A

Product Description

The VALUE COLLECTION ZMSCH70444 is a Dash 444 O-ring made from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in industrial and mechanical sealing applications. It measures 7.75 inches inside diameter, 8.25 inches outside diameter, and 0.25 inches thick, with a round cross section and a Shore A hardness of 70. This O-ring delivers reliable static and dynamic sealing in fluid and pneumatic systems where exposure to petroleum-based products is expected. It is installed by HVAC technicians, plumbers, mechanics, and general maintenance trades across a wide range of equipment types.

This O-ring is suited for use in hydraulic systems, pneumatic assemblies, fuel-handling equipment, and plumbing connections that contact petroleum products. Its temperature range of -40 degrees F to 250 degrees F makes it appropriate for both refrigeration-adjacent low-temperature service and moderate-heat applications. Each package contains 2 pieces. Buna-N compound is widely specified in OEM equipment manuals and MRO replacement programs wherever petroleum-fluid compatibility is required.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction offers excellent resistance to petroleum-based fluids, oils, and fuels
• Shore A hardness of 70 rated as Hard, providing reliable compression set performance
• Operating temperature range of -40 degrees F to 250 degrees F
• Round cross section, Dash 444 standard sizing for broad dimensional compatibility
• Tear and abrasion resistance suited for both static and dynamic sealing environments
• Meets SAE and MIL-Spec standards

Compatibility

Designed for use with petroleum products and petroleum-based hydraulic or lubricating fluids. Compatible with systems specifying Dash 444 Buna-N O-rings per SAE or MIL-Spec standards. Not recommended for use with ozone-generating environments, direct sunlight exposure, or applications requiring FDA-approved materials.

Installation Notes

O-rings should be installed by qualified mechanics or maintenance technicians following the equipment manufacturer's assembly procedures. De-pressurize and isolate the system before removing or replacing any sealing components. Inspect the groove and mating surfaces for burrs or damage prior to installation. Do not store Buna-N O-rings near motors, electrical equipment, or in direct sunlight, as ozone and UV exposure degrade nitrile elastomers over time.