Value Collection ZMSCHB90117 Nbr O-ring Dash 8-117 50-pack

Product Description

The VALUE COLLECTION ZMSCHB90117 is a Dash 8-117 rectangular cross-section backup ring made from Nitrile Butadiene Rubber (NBR). It measures 0.832 inches inside diameter, 1 inch outside diameter, and 0.045 inches thick. Rated at 90 durometer, this extra-hard backup ring is designed to prevent O-ring extrusion under pressure. It operates across a temperature range of -40 to 250 degrees F. Each package contains 50 pieces, making it a practical stocking item for plumbing, hydraulic, and fluid-system service work performed by licensed plumbers, HVAC technicians, and industrial maintenance trades.

Backup rings in the Dash 8-117 size are commonly used in hydraulic cylinders, pneumatic assemblies, fluid connectors, and low-pressure plumbing fittings where dynamic or static sealing is required. The rectangular cross section distributes load evenly across the sealing surface and resists spiral failure. The NBR compound performs reliably in contact with petroleum-based oils, fuels, and water-based fluids. This size is a standard fitment in residential and light commercial fluid-handling systems.

Key Features

• Dash 8-117 designation for straightforward cross-reference and replacement sourcing
• 90 durometer extra-hard NBR construction resists extrusion at elevated system pressures
• Rectangular cross section provides stable, even load distribution against mating surfaces
• Rated for service from -40 to 250 degrees F, suitable for a wide range of fluid-system temperatures
• Compatible with petroleum-based oils, fuels, and water-based hydraulic fluids
• 50-piece package supports shop stocking and repeat service calls

Compatibility

Designed as an OEM-style replacement backup ring for hydraulic, pneumatic, and plumbing assemblies requiring a Dash 8-117 rectangular NBR seal with a 0.832-inch inside diameter and 1-inch outside diameter.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or hydraulic system technicians. Always depressurize and isolate the fluid circuit before disassembling any fitting or cylinder to replace seals. Inspect the gland and mating surfaces for scoring or burrs before installing the new backup ring. Avoid rolling, twisting, or stretching the ring beyond its natural diameter during installation to prevent compromising the seal.