Value Collection ZMSCHB90027 Nbr Backup O-ring Dash 8-027 50pk

Product Description

The VALUE COLLECTION ZMSCHB90027 is a rectangular cross-section backup O-ring made from Nitrile Butadiene Rubber (NBR), designed to prevent O-ring extrusion in high-pressure sealing applications. It carries a Dash 8-027 designation and measures 1.33 inches inside diameter by 1.436 inches outside diameter with a thickness of 0.0468 inches. The 90 durometer hardness rating places this ring in the extra-hard category, making it suitable for dynamic and static sealing scenarios where softer rings would deform or migrate under pressure. Operating temperature range spans -40 to 250 degrees F. Each package contains 50 rings. Installation is typically performed by plumbers, fluid power technicians, and maintenance mechanics working on hydraulic, pneumatic, or fluid handling assemblies.

This backup ring is used in residential and commercial applications wherever NBR-compatible sealing is required at moderate to elevated temperatures. It is well suited for hydraulic cylinders, pneumatic fittings, pump housings, and valve assemblies that see pressure cycling. The rectangular cross section seats cleanly in standard O-ring grooves and acts as a support ring to reduce extrusion gap blowout. The Dash 8-027 designation aligns with standard O-ring sizing charts used across the fluid sealing industry.

Key Features

• Nitrile Butadiene Rubber construction with broad chemical resistance to oils, fuels, and hydraulic fluids
• 90 durometer extra-hard rating resists extrusion under high-pressure conditions
• Rectangular cross-section profile provides positive backup support in standard O-ring grooves
• Temperature range of -40 to 250 degrees F suits a wide range of fluid system environments
• Dash 8-027 sizing aligns with industry-standard O-ring groove dimensions
• Packaged in a quantity of 50 for shop or service truck stocking

Compatibility

Designed as a standard Dash 8-027 backup ring for use with NBR-compatible O-ring groove assemblies in hydraulic, pneumatic, and general fluid sealing applications. Verify groove dimensions against inside diameter, outside diameter, and thickness specifications before installation.

Installation Notes

Power down or depressurize the system fully before removing any seals or fittings. Clean the groove thoroughly and inspect for burrs or damage that could compromise the new ring. Lubricate the ring lightly with a compatible fluid before seating to avoid pinching or rolling during assembly. This work is typically performed by licensed plumbers, hydraulic technicians, or qualified maintenance personnel following applicable equipment service procedures.