Value Collection ZMSCH90209 Dash 209 Nbr O-ring 50-pack

Product Description

The VALUE COLLECTION ZMSCH90209 is a Dash 209 O-ring made from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in fluid sealing applications. It measures 0.688 inches inside diameter, 0.938 inches outside diameter, and 0.125 inches thick with a round cross-section. Rated at 90 durometer, this extra-hard O-ring delivers excellent resistance to petroleum products along with strong compression set, tear resistance, and abrasion resistance. It is rated for service from -40 degrees F to 250 degrees F. Plumbers, HVAC technicians, and mechanical contractors use this O-ring in hydraulic, pneumatic, and fuel-system applications where reliable sealing under pressure is required.

This O-ring is suited for residential and commercial applications involving petroleum-based fluids, hydraulic oils, fuels, and lubricants. Its Buna-N compound makes it a standard choice for sealing fittings, valves, pumps, and manifolds in HVAC refrigerant-adjacent systems, plumbing assemblies, and general mechanical equipment. The package contains 50 O-rings, making it appropriate for service fleets, shop stock, and bulk repair jobs where consistent Dash 209 sizing is needed across multiple assemblies.

Key Features

• Dash 209 standard sizing: 0.688 inches ID x 0.938 inches OD x 0.125 inches thick
• Nitrile Butadiene Rubber (Buna-N) compound with excellent petroleum product resistance
• 90 durometer extra-hard rating for high-compression sealing applications
• Operating range of -40 degrees F to 250 degrees F
• Round cross-section for consistent groove seating and leak-free compression
• Meets SAE and MIL-Spec standards; UNSPSC Code 31401503

Compatibility

Compatible with petroleum products, hydraulic oils, fuels, and lubricants. Designed as a standard Dash 209 O-ring replacement for hydraulic, pneumatic, and mechanical sealing applications where Buna-N material is specified. Not FDA approved; not recommended for food-contact or ozone-heavy environments. Store away from direct sunlight and electrical equipment that may generate ozone.

Installation Notes

O-ring installation should be performed by a licensed plumber, HVAC technician, or qualified mechanical technician. Depressurize and isolate the system before removing any existing O-ring or fitting. Inspect the seating groove for wear, scoring, or contamination before installing the new O-ring. Avoid twisting or pinching the O-ring during installation; a light coat of compatible lubricant aids proper seating without compromising the seal.