Value Collection ZMSCH70329 O-ring Dash 329 Nitrile Nbr

Product Description

The VALUE COLLECTION ZMSCH70329 is a Dash 329 Nitrile Butadiene Rubber (NBR) O-ring with a round cross section, sized at 2.0000 inches inside diameter and 2.3750 inches outside diameter with a 0.1875-inch thickness. Rated at 70 Shore A hardness, this O-ring is the most widely used elastomer in fluid-sealing applications. NBR compound delivers excellent resistance to petroleum-based fluids, strong compression set performance, and reliable tear and abrasion resistance. It is suitable for service temperatures ranging from -40 degrees F to 250 degrees F. HVAC technicians, plumbers, and industrial maintenance pros install this part in systems handling oil, fuel, hydraulic fluid, and similar petroleum products.

This O-ring is appropriate for residential and commercial applications where petroleum-based fluid compatibility is required. Common installation scenarios include pump seals, valve bodies, fittings, and hydraulic or pneumatic assemblies. The Dash 329 designation follows standard AS568 sizing, making it a straightforward drop-in for existing Dash 329 groove specifications. It is not recommended for exposure to ozone, strong acids, or direct sunlight during storage, and should be kept away from motors or other equipment that may generate ozone.

Key Features

• Nitrile Butadiene Rubber (NBR/Buna-N) construction — most widely used O-ring elastomer for petroleum service
• 2.0000-inch inside diameter x 2.3750-inch outside diameter x 0.1875-inch thick, Dash 329 standard sizing
• 70 Shore A hardness rating — classified as hard durometer for compression-set resistance
• Operating range of -40 degrees F to 250 degrees F for broad service conditions
• Round cross section for reliable seating in standard AS568 Dash 329 grooves
• Meets SAE and MIL-Spec standards

Compatibility

Designed as a standard Dash 329 replacement O-ring compatible with petroleum products, hydraulic fluids, and similar media. Fits any application specifying a Dash 329 groove per AS568 sizing. Not compatible with ozone-generating environments, strong oxidizing agents, or ketone-based fluids.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or industrial maintenance mechanics during pump, valve, or fitting service. Relieve all system pressure and drain the fluid circuit before removing the old O-ring. Lightly lubricate the replacement O-ring with a compatible petroleum-based grease before seating to prevent nicking or rolling during assembly. Do not store unused O-rings in direct sunlight or near motors and electrical equipment that may generate ozone, as this degrades NBR compound over time.