Value Collection ZMSCH70320 O-ring Dash 320 Buna-n 70A

Product Description

The VALUE COLLECTION ZMSCH70320 is a Dash 320 Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, sized at 1.125 inches inside diameter, 1.5 inches outside diameter, and 0.1875 inches thick. Rated at 70 Shore A hardness, this O-ring delivers reliable sealing performance in hydraulic, pneumatic, plumbing, and HVAC applications where contact with petroleum-based fluids is expected. It carries SAE and MIL-Spec standards compliance. HVAC technicians, plumbers, and mechanical contractors use this O-ring as a sealing element in valves, fittings, pumps, and fluid-handling assemblies. Sold in a package quantity of 50.

This O-ring is well suited for residential and light commercial systems where petroleum product exposure is routine, including refrigeration oil circuits, hydraulic line connections, and fuel-handling components. The Buna-N compound is the most widely used O-ring elastomer in the trade, chosen for its broad chemical compatibility, solid compression set resistance, and durability under cyclic loading. It performs across a temperature range of -40 degrees F to 250 degrees F, making it appropriate for the majority of standard mechanical service environments encountered in plumbing and HVAC work.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products and hydraulic fluids
• 70 Shore A hardness rating for reliable sealing under compression in standard-duty applications
• Round cross section, 0.1875 inches thick, conforming to Dash 320 dimensional standard
• Operating temperature range of -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Package quantity of 50 units; minimum order quantity of 1

Compatibility

Compatible with petroleum products and petroleum-based fluids. Designed as an OEM-style replacement or service O-ring for valves, fittings, pumps, and fluid-handling assemblies requiring a Dash 320 Buna-N seal. Should not be used in direct contact with ozone-generating equipment, strong oxidizers, or in direct sunlight storage conditions.

Installation Notes

Licensed plumbers, HVAC technicians, and mechanical contractors typically install O-rings of this type during valve service, fitting replacement, or pump overhaul. Shut off all fluid supply and relieve system pressure completely before removing the old O-ring or installing the replacement. Lightly lubricate the O-ring with a compatible fluid or O-ring lubricant before seating to prevent tearing during installation. Avoid storing unused O-rings near motors, electrical equipment, or in direct sunlight, as ozone and UV exposure degrade Buna-N compounds over time.