Value Collection ZMSCH70339 O-ring Dash 339 Buna-n

Product Description

The VALUE COLLECTION ZMSCH70339 is a Dash 339 Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, designed for use in hydraulic, pneumatic, and fluid-sealing applications. It measures 3.25 inches inside diameter, 3.625 inches outside diameter, and 0.1875 inches thick. Rated at 70 durometer hardness, this O-ring delivers reliable compression set resistance along with strong tear and abrasion resistance. The Buna-N elastomer compound is the most widely used O-ring material in the trade, valued for its excellent compatibility with petroleum-based fluids and oils. It conforms to SAE and MIL-Spec standards and is sold in a package quantity of 25.

This O-ring is suited for residential and commercial plumbing, hydraulic systems, fuel handling equipment, and general industrial fluid sealing where petroleum product exposure is expected. Its operating temperature range of -40 degrees F to 250 degrees F makes it appropriate for a broad range of service environments. HVAC technicians, plumbers, and industrial maintenance professionals routinely use Dash 339 Buna-N O-rings as replacement seals in pumps, valves, fittings, and manifold assemblies.

Key Features

• Buna-N elastomer with excellent resistance to petroleum products, oils, and fuels
• 70 durometer hardness rating for reliable compression and sealing performance
• Round cross section, Dash 339 designation for standardized sizing
• Operating range of -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Strong tear and abrasion resistance for extended service life

Compatibility

Compatible with petroleum products and petroleum-based fluids. Designed for use in any application requiring a standard Dash 339 O-ring with Buna-N material. Not recommended for exposure to ozone, direct sunlight during storage, or environments near motors or other electrical equipment that may generate ozone.

Installation Notes

Installation is typically performed by plumbers, HVAC technicians, or industrial mechanics during pump, valve, or fitting service. Shut off fluid supply and relieve system pressure completely before replacing any O-ring seal. Lubricate the O-ring with a compatible petroleum-based or silicone-based lubricant prior to seating to reduce the risk of tearing during installation. Do not store unused O-rings in direct sunlight or near ozone-generating equipment, as this will degrade the elastomer.