Value Collection ZMSCH90435 O-ring Dash 435 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90435 is a Dash 435 Buna-N (Nitrile Butadiene Rubber) O-ring designed for static and dynamic sealing applications across a wide range of fluid systems. With an inside diameter of 5.75 inches, an outside diameter of 6.25 inches, and a cross-section thickness of 0.25 inches, this O-ring carries an extra-hard 90 durometer rating that resists compression set and deformation under sustained load. It operates reliably from -40 to 250 degrees F, making it a versatile choice for systems that see both cold-start and elevated service temperatures. Licensed tradespeople in HVAC, plumbing, and industrial maintenance rely on Buna-N for its proven performance with petroleum-based fluids.

This O-ring is suited for use in hydraulic fittings, pump housings, valve bodies, refrigerant service ports, compressor end caps, and fluid-handling assemblies where contact with petroleum-based oils, fuels, or hydraulic fluids is expected. Its extra-hard 90 durometer formulation is particularly appropriate in high-pressure or high-vibration environments where softer compounds would extrude or degrade more rapidly. The package contains 10 O-rings, making it practical for field service kits or shop inventory replenishment.

Key Features

• Buna-N (NBR) compound offers excellent resistance to petroleum products, oils, and fuels
• Extra-hard 90 durometer rating reduces compression set and resists extrusion under load
• Operating range of -40 to 250 degrees F supports cold-climate startups and elevated service temps
• Good tear and abrasion resistance extends service life in dynamic applications
• Meets SAE and MIL-Spec standards
• Round cross-section; black color; package quantity of 10

Compatibility

Compatible with petroleum products, hydraulic oils, and fuels per supplier specifications. Designed as a standard Dash 435 O-ring replacement for any groove or fitting machined to AS568 Dash 435 dimensions. Not FDA approved; not recommended for contact with ozone sources such as electric motors or direct sunlight storage.

Installation Notes

O-ring installation should be performed by a qualified technician following system-specific lockout and depressurization procedures before opening any fluid circuit. Lubricate the O-ring with a compatible fluid or O-ring lubricant prior to seating to prevent rolling or tearing during assembly. Do not expose Buna-N O-rings to ozone-generating equipment or prolonged direct sunlight, as these conditions degrade NBR compound. Inspect the mating groove for burrs or damage before installation to ensure a proper seal.