Value Collection ZMSCH2.4X5.6 O-ring 5.6 in Id Nbr

Product Description

The VALUE COLLECTION ZMSCH2.4X5.6 is a Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, designed for static and dynamic sealing applications in fluid and pneumatic systems. It measures 5.6 inches inside diameter and 2.4 inches thick, with a Shore A hardness of 70 — rated hard — making it well suited for moderate-pressure sealing environments. The black NBR compound delivers excellent resistance to petroleum-based fluids, oils, and fuels. Licensed plumbers, pipefitters, and mechanical technicians commonly install this O-ring in hydraulic, pneumatic, and fuel-handling assemblies.

This O-ring is suited for residential and commercial plumbing, HVAC, hydraulic, and industrial fluid-handling systems where petroleum product compatibility is required. Operating temperature range spans -40 degrees F to 250 degrees F, covering a broad range of seasonal and process conditions. The round cross section allows consistent compression and predictable sealing load across standard grooves. It is compatible with petroleum products and mineral-based oils but should not be used with ketones, esters, or ozone-heavy environments. Buna-N is the most widely used O-ring elastomer in the trade, making this a common stock item for field service kits.

Key Features

• Buna-N (NBR) compound offers excellent resistance to petroleum products, oils, and fuels
• Round cross section ensures uniform compression set and consistent sealing load
• Shore A hardness of 70 (hard rating) for moderate-pressure sealing duty
• Operating range of -40 degrees F to 250 degrees F for wide thermal coverage
• Meets SAE and MIL-Spec standards
• Black color for easy identification as standard NBR compound

Compatibility

Compatible with petroleum products and mineral-based oils; conforms to SAE and MIL-Spec standards. Not FDA approved. Should not be stored in direct sunlight or near motors or electrical equipment that may generate ozone. Not recommended for use with ketone- or ester-based fluids.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or mechanical technicians. Depressurize and de-energize the system fully before removing or replacing any O-ring seal. Lubricate the O-ring with a compatible fluid or grease prior to installation to prevent tearing during seating. Inspect the groove dimensions against the O-ring cross section before installation to confirm proper fit and compression.