Value Collection ZMSCH70319 O-ring Dash 319 Buna-n

Product Description

The VALUE COLLECTION ZMSCH70319 is a Dash 319 Buna-N (Nitrile Butadiene Rubber) O-ring designed for sealing applications in fluid and pneumatic systems. With a 1.063-inch inside diameter, 1.438-inch outside diameter, and a 0.1875-inch round cross section, this O-ring delivers reliable static and dynamic sealing performance. Rated at 70 Shore A hardness, it withstands operating temperatures from -40 degrees F to 250 degrees F. Its Buna-N compound provides excellent resistance to petroleum-based fluids, fuels, and hydraulic oils, making it a go-to choice for HVAC, plumbing, and fluid handling service work.

This O-ring is suited for use in residential and commercial systems where petroleum-based media are present, including hydraulic lines, fuel systems, refrigeration components, and general plumbing assemblies. It is commonly installed by HVAC technicians, plumbers, and industrial maintenance professionals during equipment service, valve replacement, or pump rebuilds. The round cross section ensures consistent seating in standard O-ring grooves. The part is packaged in quantities of 25, making it practical for shops and field technicians who service multiple units.

Key Features

• Buna-N (Nitrile) elastomer — the most widely used O-ring material for petroleum product compatibility
• Dash 319 standard sizing: 1.063 inches ID, 1.438 inches OD, 0.1875 inches thick
• 70 Shore A hardness rating with hard hardness classification
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross section for consistent groove seating and compression set performance
• Meets SAE and MIL-Spec standards

Compatibility

Designed for use with petroleum products and petroleum-based hydraulic fluids. Compatible material call-out from manufacturer is petroleum products. Not FDA approved. Should not be stored in direct sunlight or near motors or electrical equipment that may generate ozone.

Installation Notes

Installation is performed by qualified HVAC technicians, plumbers, or mechanical maintenance personnel. Always depressurize and isolate the system before replacing an O-ring to prevent injury and fluid release. Lubricate the O-ring lightly with a compatible fluid before seating to reduce installation stress and prevent tearing. Inspect the groove for damage, debris, or out-of-spec dimensions before installing the replacement ring.