Value Collection ZMSCHB90016 Backup Ring O-ring Nbr 100-pack

Product Description

The VALUE COLLECTION ZMSCHB90016 is a Dash 8-016 backup ring O-ring manufactured from Nitrile Butadiene Rubber (NBR) with a 90 durometer extra-hard hardness rating. It measures 0.643 inches inside diameter, 0.75 inches outside diameter, and 0.047 inches thick with a rectangular cross section. Rated for service from -40 to 250 degrees F, this ring is well suited for hydraulic, pneumatic, and fluid-handling assemblies where standard O-rings require a backup element to prevent extrusion under pressure. Plumbers, HVAC technicians, and industrial maintenance professionals install these in fittings, valve stems, and cylinder end caps.

This backup ring is appropriate for both residential and commercial applications where NBR compatibility with petroleum-based oils, fuels, and water is required. The rectangular cross section seats firmly alongside a primary O-ring to resist blowout in dynamic and static sealing arrangements. Sold in a package quantity of 100, it suits shop stock replenishment and service fleet inventories that require consistent Dash 8-016 sizing across multiple equipment types.

Key Features

• Nitrile Butadiene Rubber (NBR) construction resists petroleum oils, hydraulic fluids, and water
• 90 durometer extra-hard rating minimizes extrusion in high-pressure applications
• Operating temperature range of -40 to 250 degrees F covers a broad range of service environments
• Rectangular cross section provides stable backup support for primary O-ring seals
• Dash 8-016 standard sizing for consistent fitment across compatible fittings and hardware
• Package quantity of 100 supports bulk stocking and fleet service needs

Compatibility

Designed as a standard Dash 8-016 backup ring for use in hydraulic, pneumatic, and fluid-handling assemblies that require NBR O-ring backup elements with a rectangular cross section.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or qualified maintenance mechanics. Depressurize and isolate the system completely before disassembling any fitting or valve that contains O-ring seals. Inspect the gland for burrs or surface damage before seating the backup ring, and ensure the primary O-ring and backup ring are installed in the correct orientation relative to the pressure side. Avoid rolling or twisting the ring during installation to prevent deformation of the rectangular cross section.