Value Collection ZMSCH90908 O-ring Dash 908 Nbr

Product Description

The VALUE COLLECTION ZMSCH90908 is a Dash 908 Nitrile Butadiene Rubber (NBR) O-ring designed for sealing applications in fluid and pneumatic systems. It measures 0.644 inches inside diameter, 0.818 inches outside diameter, and 0.087 inches thick, with a cross-section that is round. Rated at 90 durometer (extra hard), this O-ring handles temperatures from -40 to 250 degrees F. NBR is the most widely used O-ring elastomer in trade applications, offering reliable sealing in systems exposed to petroleum-based fluids. Licensed plumbers, HVAC technicians, and mechanical contractors reach for NBR O-rings as a standard consumable replacement component.

This O-ring is suited for residential and commercial plumbing, HVAC refrigerant and oil circuits, hydraulic fittings, and other applications involving petroleum-based media. Its extra-hard 90 durometer rating makes it a strong choice where higher extrusion resistance is needed under elevated system pressures. The -40 to 250 degrees F temperature range covers most standard mechanical and HVAC service scenarios. It ships in a package quantity of 100, supporting service van stock and shop inventory alike.

Key Features

• NBR material provides excellent resistance to petroleum products including oils, fuels, and hydraulic fluids
• 90 durometer extra-hard rating delivers high extrusion resistance under pressure
• Operating temperature range: -40 to 250 degrees F
• Round cross-section, Dash 908 standard sizing for consistent fit in standard O-ring grooves
• Excellent compression set, tear resistance, and abrasion resistance
• Meets SAE and MIL-Spec standards

Compatibility

Compatible with petroleum products and petroleum-based fluid systems. Designed for use in standard Dash 908 O-ring groove applications. Not recommended for exposure to ozone, direct sunlight during storage, or systems requiring FDA-approved elastomers.

Installation Notes

Plumbers, HVAC technicians, and hydraulic system mechanics typically install NBR O-rings as part of fitting assembly or component replacement. Always depressurize and isolate the system before replacing any O-ring. Avoid storing NBR O-rings near motors, electrical equipment, or in direct sunlight, as ozone exposure degrades the material. Lubricate the O-ring with a compatible fluid during installation to seat it properly and prevent tearing during assembly.