Value Collection ZMSCHB90015 Nbr O-ring Backup Ring Dash 8-015

Product Description

The VALUE COLLECTION ZMSCHB90015 is a rectangular cross-section nitrile butadiene rubber (NBR) backup ring designed to prevent O-ring extrusion under pressure in hydraulic, pneumatic, and fluid-sealing applications. It carries a Dash 8-015 designation with an inside diameter of 0.58 inches, an outside diameter of 0.686 inches, and a thickness of approximately 0.047 inches (3/64 inches). Rated at 90 durometer (Extra Hard), this backup ring maintains its form under elevated mechanical loads. The NBR compound provides a working temperature range of -40 degrees F to 250 degrees F, making it suitable for a wide range of industrial and trade service environments. Each package contains 100 rings.

Backup rings in this size and durometer class are commonly used in hydraulic cylinder assemblies, valve stem packing, pneumatic actuators, and plumbing connections where standard O-rings require anti-extrusion support. They are appropriate for residential and commercial mechanical systems handled by licensed plumbers, pipefitters, and hydraulic service technicians. The NBR material performs well with petroleum-based oils, water, and many common refrigerants, making it a practical choice across HVAC, plumbing, and fluid-power applications.

Key Features

• Rectangular cross section provides direct backup support to prevent O-ring extrusion under load
• 90 durometer Extra Hard rating resists deformation at high operating pressures
• NBR compound rated for -40 degrees F to 250 degrees F continuous service
• Dash 8-015 designation for straightforward cross-reference and replacement sourcing
• Inside diameter of 0.58 inches and outside diameter of 0.686 inches for precise groove fit
• Sold in a 100-piece package to support bench stock and service van inventory

Compatibility

Designed as an OEM-style replacement or service backup ring for hydraulic, pneumatic, and fluid-sealing assemblies requiring a Dash 8-015 rectangular-section NBR ring at 90 durometer.

Installation Notes

Backup rings are installed by licensed plumbers, pipefitters, or hydraulic service technicians. De-energize or depressurize the system fully before disassembling any seal cavity. Inspect the groove dimensions against the ring specifications before installation to ensure proper fit and avoid seal failure. Avoid stretching or nicking the ring during assembly, as surface damage will compromise the sealing function.