Value Collection ZMSCHB90008 Backup Ring Dash 8-008 Nbr

Product Description

The VALUE COLLECTION ZMSCHB90008 is a rectangular cross-section backup ring made from Nitrile Butadiene Rubber (NBR) rated at 90 durometer hardness. At 0.202 inches inside diameter and 0.308 inches outside diameter with a 0.047-inch thickness, this Dash 8-008 backup ring is designed to prevent O-ring extrusion under pressure in hydraulic and pneumatic assemblies. The extra-hard 90 durometer rating provides high resistance to deformation at elevated pressures. It is installed by technicians working on fluid power systems, plumbing assemblies, and mechanical sealing applications where standard O-rings require anti-extrusion support.

This backup ring is suited for use in low- to medium-bore hydraulic cylinders, valve stems, fitting assemblies, and similar components found in HVAC equipment, plumbing systems, and general industrial machinery. It is packaged in quantities of 100 pieces per package, making it appropriate for service shops and technicians who replace backup rings as part of routine seal kit maintenance. The operating temperature range of -40 to 250 degrees F makes it compatible with a broad range of fluid media and service conditions typically encountered in trade applications.

Key Features

• Rectangular cross-section profile provides consistent anti-extrusion support alongside standard O-rings
• NBR material offers good resistance to petroleum-based fluids, hydraulic oils, and water
• 90 durometer extra-hard rating resists deformation under high system pressure
• Temperature range of -40 to 250 degrees F suits both cold-climate startup and elevated operating conditions
• Dash 8-008 designation allows direct cross-reference to standard seal kits and engineering drawings
• Sold in packs of 100 for shop stock and high-volume service use

Compatibility

Designed as a standard Dash 8-008 backup ring for use with corresponding O-ring groove dimensions in hydraulic, pneumatic, and fluid sealing assemblies requiring anti-extrusion support at 0.202 inches inside diameter.

Installation Notes

Installation should be performed by a qualified technician familiar with hydraulic or pneumatic sealing systems. De-pressurize and isolate the system fully before disassembling any fitting, cylinder, or valve containing this component. Inspect the mating groove for burrs or damage before seating the backup ring, and avoid stretching or twisting the ring during installation. Follow applicable equipment manufacturer guidelines and any relevant plumbing or mechanical codes for the system type being serviced.