Value Collection ZMSCH90239 O-ring Dash 239 Nbr 90A

Product Description

The VALUE COLLECTION ZMSCH90239 is a Dash 239 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 3.625 inches inside diameter, 3.875 inches outside diameter, and 0.125 inches thick, with a round cross-section and an extra-hard 90 durometer rating. The operating temperature range runs from -40 degrees F to 250 degrees F. This O-ring delivers excellent resistance to petroleum-based fluids along with strong compression set, tear resistance, and abrasion resistance. Licensed plumbers, HVAC technicians, and industrial maintenance professionals install this part in hydraulic, pneumatic, and fluid-transfer assemblies.

The ZMSCH90239 is suited for static and dynamic sealing in systems that handle petroleum products, oils, fuels, and hydraulic fluids. Its 90 durometer hardness makes it appropriate for higher-pressure applications where a softer ring would extrude or deform under load. Typical install environments include hydraulic cylinders, pipe fittings, pumps, compressors, and other fluid-handling equipment in residential, commercial, and light industrial service. The Buna-N compound conforms to SAE and MIL-Spec standards. This package contains 50 O-rings.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent petroleum-fluid resistance
• Extra-hard 90 durometer rating for high-pressure and high-wear sealing applications
• Operating range of -40 degrees F to 250 degrees F
• Round cross-section, Dash 239 standard sizing
• Meets SAE and MIL-Spec standards
• Package quantity of 50 rings per order

Compatibility

Compatible with petroleum products, oils, hydraulic fluids, and similar media. Designed as a standard Dash 239 O-ring replacement for hydraulic, pneumatic, and fluid-sealing assemblies where Buna-N elastomer is specified. Not recommended for exposure to ozone, direct sunlight during storage, or equipment that generates ozone such as electric motors.

Installation Notes

Installation should be performed by a licensed technician or qualified maintenance professional familiar with fluid sealing systems. Always depressurize and isolate the assembly before removing or installing any O-ring. Inspect the groove and mating surfaces for nicks, burrs, or contamination before seating the new ring. Do not store Buna-N O-rings near motors, ozone-generating equipment, or in direct sunlight, as ozone exposure degrades the elastomer.