Value Collection ZMSCH90339 O-ring Dash 339 Nbr 25 Pack

Product Description

The VALUE COLLECTION ZMSCH90339 is a Dash 339 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 3.25 inches inside diameter, 3.625 inches outside diameter, and 0.1875 inches in cross-section thickness. Rated at 90 durometer, this extra-hard O-ring delivers strong compression set resistance along with excellent tear and abrasion performance. The operating temperature range spans -40 to 250 degrees F, making it suitable for both refrigeration-adjacent and moderate-heat service environments. Each order ships in a package quantity of 25 units.

This O-ring is used in hydraulic, pneumatic, and fluid-handling assemblies where petroleum-based media is present. Common applications include pump seals, valve bodies, cylinder end caps, fittings, and manifold face seals in HVAC, plumbing, and industrial equipment. The Buna-N compound offers excellent resistance to petroleum products, oils, fuels, and hydraulic fluids. It is not recommended for use with ozone-generating environments, direct UV exposure, or ozone-producing electrical equipment such as motors. Plumbers, HVAC technicians, and industrial maintenance professionals routinely install this size in face-seal and groove-type configurations.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound — excellent petroleum and oil resistance
• 90 durometer extra-hard rating for high-compression and high-pressure sealing
• Operating range of -40 to 250 degrees F suits refrigeration and moderate-heat service
• Round cross-section, standard Dash 339 dimensioning per SAE and MIL-Spec standards
• Tear and abrasion resistant construction for long service life in dynamic and static applications
• Package quantity of 25 units supports shop stock and service fleet use

Compatibility

Compatible with petroleum products, hydraulic oils, fuels, and similar media. Meets SAE and MIL-Spec dimensional standards for Dash 339 O-rings. Not FDA approved; not suitable for food-contact or ozone-rich environments.

Installation Notes

Power down or depressurize the system fully before removing any seals or fittings. Clean the groove and mating surfaces thoroughly before installing the new O-ring; contamination is a leading cause of premature seal failure. Lubricate the O-ring with a compatible fluid or O-ring lubricant prior to installation to prevent tearing during assembly. Follow applicable system pressure ratings and manufacturer torque guidelines for the fitting or housing being serviced.