Value Collection ZMSCH90254 O-ring Dash 254 Nbr 25-pack

Product Description

The VALUE COLLECTION ZMSCH90254 is a Buna-N (nitrile butadiene rubber) O-ring sized to Dash 254 standard dimensions: 5.5 inches inside diameter, 5.75 inches outside diameter, and 0.125 inches cross-section thickness. Rated at 90 durometer (extra hard), it delivers firm compression set resistance and strong resilience against tearing and abrasion. The operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for a wide variety of fluid-sealing applications in HVAC, plumbing, and industrial settings. Licensed trade professionals and maintenance technicians use this O-ring wherever a reliable petroleum-compatible elastomer seal is required. Each package contains 25 rings.

This O-ring is well suited for sealing applications that involve petroleum-based fluids, hydraulic oils, fuels, and many common lubricants. Typical installation scenarios include pump flanges, valve bodies, pipe unions, and fittings in residential and commercial mechanical systems. Its extra-hard 90 durometer rating makes it appropriate for higher-pressure sealing environments where softer compounds would deform excessively under load. Plumbers, HVAC technicians, and industrial maintenance crews commonly specify Buna-N O-rings at this size for both new installation and field replacement work.

Key Features

• Dash 254 standard sizing: 5.5 inches ID, 5.75 inches OD, 0.125 inches thickness
• Buna-N (nitrile butadiene rubber) material with excellent resistance to petroleum products
• 90 durometer extra-hard rating for superior compression set and abrasion resistance
• Temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Sold in a 25-piece package with a minimum order quantity of 1

Compatibility

Compatible with petroleum products, hydraulic oils, fuels, and similar petroleum-based media. Designed as a standard Dash 254 replacement O-ring for use in systems where Buna-N elastomer compounds are specified. Not recommended for use with ozone, strong oxidizers, ketones, or esters.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or qualified maintenance personnel. Always depressurize and isolate the system before removing or replacing any sealing components. Inspect the mating groove and seating surfaces for damage or contamination before installing a new O-ring. Do not store Buna-N O-rings in direct sunlight or near motors and other electrical equipment that may generate ozone, as ozone degrades nitrile rubber compounds.