Value Collection ZMSCH70909 O-ring Dash 909 Nbr 100-pack

Product Description

The VALUE COLLECTION ZMSCH70909 is a Dash 909 O-ring made from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. With a 0.706-inch inside diameter, 0.900-inch outside diameter, and a 0.097-inch thick round cross section, this O-ring is sized to the SAE Dash 909 standard. It carries a Shore A hardness of 70, placing it in the hard rating category. The Buna-N compound delivers excellent resistance to petroleum-based fluids, strong compression set performance, and solid tear and abrasion resistance. Licensed plumbers, HVAC technicians, and hydraulic system technicians rely on this O-ring for reliable static and dynamic sealing in fuel, oil, and hydraulic circuits.

This O-ring is intended for use as an O-ring boss gasket on straight-thread tube fittings, a common connection style in HVAC refrigerant lines, hydraulic assemblies, and plumbing supply systems. It is compatible with petroleum-based products including oils, fuels, and hydraulic fluids. The operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for both standard HVAC service and light industrial applications. This listing covers a package quantity of 100 O-rings, appropriate for shop stock or multi-unit service calls. Store away from direct sunlight, ozone sources, and electrical equipment that may generate ozone.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• Dash 909 standard sizing: 0.706 inches ID, 0.900 inches OD, 0.097 inches thick
• Round cross section, Shore A hardness of 70 (hard rating)
• Operating range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Sized as an O-ring boss gasket for straight-thread tube fittings

Compatibility

Designed for use as an O-ring boss gasket on straight-thread tube fittings in systems that use petroleum-based fluids, including HVAC, hydraulic, and plumbing applications. Compatible with petroleum products; not FDA approved for food or potable water contact.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or hydraulic technicians. Shut off system pressure and depressurize the line completely before replacing any O-ring. Lightly lubricate the O-ring with a compatible fluid or petroleum-based lubricant before seating to prevent pinching or tearing during assembly. Avoid storing unused O-rings near motors, ozone-generating equipment, or in direct sunlight, as ozone and UV exposure degrade Buna-N compounds over time.