Value Collection ZMSCH70911 O-ring Dash 911 Nitrile

Product Description

The VALUE COLLECTION ZMSCH70911 is a Dash 911 Buna-N o-ring designed for use as an O-Ring Boss (ORB) gasket on straight-thread tube fittings. Manufactured from Nitrile Butadiene Rubber (NBR), also known as Buna-N, this o-ring measures 0.863 inches inner diameter, 1.095 inches outer diameter, and 0.116 inches cross-section thickness. It carries a Shore A hardness rating of 70, placing it in the hard range. The round cross-section profile seats consistently into standard ORB ports. Plumbers, HVAC technicians, and hydraulic system installers rely on this elastomer for sealing fuel, oil, and petroleum-based fluid connections across a wide range of service temperatures.

This o-ring is suited for residential and light commercial plumbing, HVAC refrigerant-adjacent fittings, hydraulic lines, and fluid power systems where petroleum-based media is present. The Buna-N compound provides excellent resistance to petroleum products, fuels, and oils, making it a standard choice for sealing straight-thread boss fittings in both new installations and service replacements. It is rated for use from -40 degrees F to 250 degrees F, covering most HVAC, plumbing, and light industrial operating ranges. Sold in a package quantity of 100 with a minimum order quantity of 1 package.

Key Features

• Buna-N (NBR) elastomer — the most widely used o-ring material for petroleum and oil service
• Rated -40 degrees F to 250 degrees F operating temperature range
• Shore A 70 hardness for reliable compression set and sealing force
• Round cross-section seats consistently in standard Dash 911 ORB grooves
• Excellent tear and abrasion resistance for repeated make-and-break service
• Meets SAE and MIL-Spec standards

Compatibility

Designed as an O-Ring Boss gasket for straight-thread tube fittings using the Dash 911 size designation. Compatible with petroleum products, oils, and fuels. Not recommended for exposure to ozone sources, direct sunlight storage, or proximity to motors and other electrical equipment that generate ozone. Not FDA approved.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or hydraulic system mechanics. Shut off and depressurize the system before removing or installing any fittings. Lightly lubricate the o-ring with a compatible fluid or petroleum-based lubricant before seating to prevent pinching or tearing during assembly. Inspect the seating groove for nicks or burrs that could compromise the seal before installing a replacement o-ring.