Value Collection ZMSCH70908 O-ring Dash 908 Nitrile

Product Description

The VALUE COLLECTION ZMSCH70908 is a Dash 908 O-ring boss gasket designed for straight-thread tube fittings in hydraulic, pneumatic, and fluid-handling systems. Made from Nitrile Butadiene Rubber (Buna-N), this round cross-section O-ring measures 0.644 inches ID, 0.818 inches OD, and 0.087 inches thick. It carries a hardness rating of 70 Shore A, classifying it as hard. Rated for service from -40 degrees F to 250 degrees F, it is suited for applications where petroleum-based fluids are present. Licensed plumbers, HVAC technicians, and fluid-systems mechanics commonly use this O-ring as a sealing element in fitting assemblies.

This O-ring is used in residential and commercial applications wherever Dash 908 boss gaskets are required at straight-thread ports and fittings. Typical install scenarios include hydraulic lines, refrigerant-side connections, fuel systems, and general plumbing fitting assemblies that contact petroleum products. It meets SAE and MIL-Spec standards, making it appropriate for both commercial mechanical work and maintenance applications requiring specification-grade sealing components. Sold in a package quantity of 100, it suits bench-stock and service-van replenishment needs.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction — the most widely used O-ring elastomer for petroleum-fluid compatibility
• Rated -40 degrees F to 250 degrees F continuous service temperature range
• 70 Shore A hardness provides resistance to extrusion under pressure
• Excellent compression set, tear resistance, and abrasion resistance for long seal life
• Round cross-section profile conforms to standard O-ring boss port geometry
• Meets SAE and MIL-Spec standards

Compatibility

Designed as an O-ring boss gasket for straight-thread tube fittings requiring a Dash 908 O-ring. Compatible with petroleum products and petroleum-based fluid systems. Not recommended for exposure to ozone sources, direct sunlight during storage, or environments where ozone-generating equipment such as electric motors is nearby. Not FDA approved.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or hydraulic-systems mechanics depending on the application. Depressurize and drain the system fully before replacing O-rings at any fitting. Lubricate the O-ring lightly with a compatible fluid or assembly lubricant before seating to prevent tearing during torque-up. Do not reuse O-rings that show signs of compression set, cracking, or surface damage.