Value Collection ZMSCHB90012 O-ring Backup Ring Nbr

Product Description

The VALUE COLLECTION ZMSCHB90012 is a rectangular-cross-section backup O-ring made from Nitrile Butadiene Rubber (NBR), designed to prevent extrusion and seal failure in hydraulic, pneumatic, and fluid-handling systems. It carries a Dash 8-012 designation with a 0.39-inch inner diameter, 0.496-inch outer diameter, and a 0.047-inch (3/64-inch) thickness. Rated at 90 durometer (extra hard), this backup ring holds its geometry under pressure cycling and resists degradation from petroleum-based fluids, oils, and fuels. Installation is performed by licensed plumbers, HVAC technicians, hydraulic system technicians, and pipefitters working on fluid-system components requiring positive sealing at static or dynamic interfaces.

This backup ring is suited for residential and commercial applications involving compressed air lines, hydraulic cylinders, valve stems, and fluid-distribution fittings. It performs within a temperature range of -40 degrees F to 250 degrees F, making it appropriate for a wide range of service environments including refrigeration-adjacent plumbing, fuel systems, and general industrial fluid control. It is sold in packages of 100 units, making it practical for service stock and repair kit assembly.

Key Features

• 90 durometer extra-hard NBR construction resists extrusion under high-pressure cycling
• Rectangular cross section provides consistent backup support behind primary O-ring seals
• Temperature range of -40 degrees F to 250 degrees F suits a broad range of fluid-system environments
• Dash 8-012 designation for straightforward cross-reference and replacement sourcing
• 0.39-inch ID x 0.496-inch OD x 0.047-inch thick for precise groove fitment
• Package quantity of 100 units supports service inventory and repair kit stocking

Compatibility

Designed as an OEM-style replacement backup ring for hydraulic, pneumatic, and fluid-handling assemblies requiring a Dash 8-012 rectangular NBR seal with a 90 durometer hardness rating.

Installation Notes

Installation is performed by licensed plumbers, pipefitters, or hydraulic technicians. Depressurize and isolate the fluid circuit completely before disassembling any seal interface. Inspect the groove for burrs, scoring, or contamination before seating the backup ring. Do not stretch or roll the ring during installation; seat it flat within the groove to maintain its rectangular profile and sealing function.