Value Collection ZMSCHB90229 O-ring Dash 8-229 Nbr 25 Pack

Product Description

The VALUE COLLECTION ZMSCHB90229 is a rectangular cross-section backup ring O-ring made from Nitrile Butadiene Rubber (NBR), designed to prevent seal extrusion in pressurized systems. It measures 2.397 inches inner diameter by 2.635 inches outer diameter with a thickness of 0.0468 inches, and carries a Dash 8-229 designation for standardized fitment identification. Rated at 90 durometer (Extra Hard), this backup ring delivers firm resistance under load, reducing the risk of primary seal failure. It is sold in a package quantity of 25, making it practical for service shops and contractors managing recurring seal inventory. Licensed technicians and pipefitters working on hydraulic, pneumatic, or fluid-handling assemblies are the typical installers.

This backup ring is suited for use in residential and commercial systems where O-ring seal integrity is critical, including hydraulic circuits, pneumatic assemblies, and plumbing or HVAC fluid connections. Its NBR material composition makes it compatible with petroleum-based oils, fuels, water, and many common refrigerants within its rated temperature range of -40 degrees F to 250 degrees F. The rectangular cross-section profile is specifically designed to back primary O-ring seals at dynamic or static groove interfaces where extrusion is a concern.

Key Features

• Rectangular cross-section profile prevents primary O-ring extrusion under pressure
• 90 durometer Extra Hard rating provides firm, stable backing support
• NBR material resists petroleum-based oils, fuels, and water
• Dash 8-229 designation ensures standardized groove fitment
• Operating temperature range of -40 degrees F to 250 degrees F
• Package quantity of 25 units supports bench stock and service inventory needs

Compatibility

Designed as a standard Dash 8-229 backup ring for use behind primary O-ring seals in hydraulic, pneumatic, and fluid-handling groove applications requiring a rectangular cross-section NBR backup ring.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, hydraulic technicians, or HVAC technicians during seal service or system overhaul. Always depressurize and lock out the system before removing or replacing any seal components. Inspect the groove dimensions for burrs or damage before seating the backup ring, and ensure the backup ring is positioned on the low-pressure side of the primary O-ring. Do not stretch the ring beyond its elastic limit during installation, and avoid using sharp tools that could nick or cut the material.