Value Collection ZMSCH70371 O-ring Dash 371 Nitrile 70A

Product Description

The VALUE COLLECTION ZMSCH70371 is a Dash 371 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 8.5 inches inside diameter, 8.875 inches outside diameter, and 0.1875 inches (3/16 inches) thick, with a round cross section and a durometer hardness rating of 70 Shore A. Buna-N compound delivers excellent resistance to petroleum-based fluids, good compression set characteristics, and strong tear and abrasion resistance. Licensed plumbers, pipefitters, and maintenance mechanics use this O-ring as a static or low-motion dynamic seal in hydraulic, pneumatic, and fluid-transfer assemblies.

This O-ring is suited for use in residential and commercial plumbing systems, hydraulic equipment, fuel-handling assemblies, and industrial machinery where contact with petroleum-based products is expected. The Dash 371 designation follows standard AS568 sizing, making it a direct drop-in for any application calling for that dash number. It is rated for service from -40 degrees F to 250 degrees F, covering most HVAC, plumbing, and general industrial operating ranges. Each package contains 5 O-rings. It meets SAE and MIL-Spec standards and is not FDA approved for food-contact use.

Key Features

• Buna-N (Nitrile Butadiene Rubber) material offers excellent resistance to petroleum-based fluids and lubricants
• 70 Shore A hardness rating provides a firm seal with reliable compression set performance
• Rated for -40 degrees F to 250 degrees F continuous service temperature range
• Round cross section with 0.1875 inches thickness for standard groove fitment
• Meets SAE and MIL-Spec standards for sealing applications
• Store away from direct sunlight and ozone-generating equipment such as electric motors to maximize service life

Compatibility

Designed as a standard AS568 Dash 371 replacement O-ring compatible with petroleum-based fluid systems including hydraulic circuits, fuel assemblies, and plumbing fittings requiring an 8.5 inches ID seal. Not compatible with applications involving ozone, strong oxidizers, or brake fluid without verifying material suitability.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or hydraulic technicians. De-pressurize and drain the system completely before removing the old O-ring and seating the replacement. Lubricate the O-ring lightly with a compatible petroleum-based grease to ease installation and prevent tearing during assembly. Do not over-stretch the O-ring or seat it with sharp tools that may nick the sealing surface.