Value Collection ZMSCH90139 O-ring Dash 139 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90139 is a Dash 139 nitrile butadiene rubber (NBR/Buna-N) O-ring designed for static and dynamic sealing applications across HVAC, plumbing, hydraulic, and general industrial systems. It measures 2.188 inches inside diameter and 2.375 inches outside diameter with a 0.0937-inch cross-section thickness. Rated at 90 durometer (extra hard), this O-ring delivers high resistance to compression set, tearing, and abrasion. Its operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for a wide range of service environments. Plumbers, HVAC technicians, and industrial mechanics are the primary installers of this component.

This O-ring is suited for use in systems that contact petroleum-based fluids, mineral oils, and related lubricants. Common applications include pump seals, valve stems, fittings, couplings, and hydraulic cylinder ports in both residential and commercial installations. The Buna-N elastomer is the most widely used O-ring material in trade applications due to its balanced performance across oil, fuel, and water service. This SKU ships in a package quantity of 50 rings, making it appropriate for service kits or shop stock replenishment.

Key Features

• Buna-N (NBR) elastomer with excellent resistance to petroleum products and mineral oils
• 90 durometer hardness rating for extra-hard, high-compression sealing performance
• Operating temperature range of -40 degrees F to 250 degrees F
• Round cross-section, 0.0937 inches thick, conforming to Dash 139 sizing standard
• Meets SAE and MIL-Spec standards
• Package quantity of 50 units per order, with a minimum order quantity of 1

Compatibility

Compatible with petroleum products, mineral oils, and hydraulic fluids. Conforms to SAE and MIL-Spec O-ring standards. Not recommended for use with ozone-generating environments, direct sunlight exposure, or systems using ozone, ketones, esters, or strong acids. FDA approval status: No.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or industrial mechanics during valve, pump, or fitting service. Always depressurize and drain the system before removing or installing O-rings. Lubricate the O-ring with a compatible fluid or O-ring lubricant prior to seating to prevent tearing during installation. Do not stretch the O-ring beyond the groove diameter, and inspect the groove for burrs or damage before reassembly.