Value Collection ZMSCHB90227 O-ring Backup Ring Nbr

Product Description

The VALUE COLLECTION ZMSCHB90227 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 operating under pressure. Sized to Dash 8-227 standards, it measures 2.147 inches inside diameter, 2.383 inches outside diameter, and 0.0468 inches thick. With a durometer hardness rating of 90 Shore A — classified as extra hard — this backup ring resists deformation under high compressive loads. It is installed by plumbers, hydraulic technicians, and fluid system mechanics wherever standard O-rings require extrusion backup support.

This backup ring is suited for residential and commercial plumbing, hydraulic cylinder assemblies, pneumatic actuators, and general fluid-sealing applications. The NBR compound provides reliable performance across a wide temperature range, making it appropriate for both cold-environment fluid systems and moderate-heat service lines. The Dash 8-227 designation confirms dimensional conformance to standard O-ring groove sizing, which simplifies cross-referencing and groove compatibility verification during service. Parts are sold in packages of 25, with a minimum order quantity of 1 package.

Key Features

• Rectangular cross section provides anti-extrusion backup support for standard O-ring seals
• Dash 8-227 standard sizing for straightforward groove compatibility verification
• 90 Shore A extra-hard durometer resists deformation under sustained compressive loads
• NBR material offers broad fluid compatibility including oils, fuels, and water-based fluids
• Rated for service from -40 degrees F to 250 degrees F
• Package quantity of 25 supports bench stock and bulk service work

Compatibility

Designed as a standard Dash 8-227 replacement backup ring for hydraulic cylinders, pneumatic actuators, and plumbing assemblies that use O-ring grooves conforming to Dash 8-227 dimensional specifications.

Installation Notes

Installation is typically performed by hydraulic technicians, plumbers, or mechanical service professionals. Depressurize and isolate the system completely before disassembling any seal gland or cylinder. Inspect the groove for burrs, scoring, or contamination before seating the backup ring; a damaged groove will compromise seal integrity regardless of ring condition. Do not overstretch the ring during installation — use a blunt plastic or nylon installation tool to avoid nicks that can cause premature failure.