Value Collection ZMSCH90221 O-ring Dash 221 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90221 is a Dash 221 Nitrile Butadiene Rubber (Buna-N) O-ring engineered for sealing applications that involve petroleum-based fluids and hydraulic media. It measures 1.438 inches inside diameter, 1.688 inches outside diameter, and 0.125 inches thick with a round cross section. Rated at 90 durometer, this is an extra-hard elastomer that delivers strong resistance to compression set, tearing, and abrasion. The operating temperature range runs from -40 degrees F to 250 degrees F, making it suitable for a wide range of mechanical and fluid-handling assemblies. Sold in packages of 50 units.

This O-ring is used in hydraulic systems, pneumatic fittings, plumbing connections, fuel handling components, and general industrial assemblies wherever petroleum product compatibility is required. Its Buna-N compound is the most widely used O-ring elastomer in trade applications, found in HVAC refrigerant isolation valves, plumbing shutoffs, pump seals, and compressor fittings. It is not FDA approved and should not be used in food-grade or potable-water-contact applications without confirming regulatory compliance. Store away from direct sunlight, electric motors, and ozone-generating equipment.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound — excellent resistance to petroleum products and hydraulic fluids
• 90 durometer extra-hard rating — resists extrusion in higher-pressure applications
• Wide temperature range: -40 degrees F to 250 degrees F
• Excellent compression set and tear and abrasion resistance
• Meets SAE and MIL-Spec standards
• Package quantity of 50 units with minimum order quantity of 1

Compatibility

Compatible with petroleum products and hydraulic fluids. Designed as a standard Dash 221 O-ring replacement for use in any assembly calling for an AS568 Dash 221 Buna-N seal.

Installation Notes

O-rings of this type are installed by licensed plumbers, HVAC technicians, hydraulic system mechanics, and industrial maintenance trades. Always depressurize and isolate the system before replacing any seal. Lightly lubricate the O-ring with a compatible fluid or O-ring lubricant before seating to prevent rolling 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 elastomers over time.