Value Collection ZMSCH70425 O-ring Dash 425 Buna-n Pack of 5

Product Description

The VALUE COLLECTION ZMSCH70425 is a Dash 425 O-ring sized at 4.5 inches inside diameter, 5 inches outside diameter, and 0.25 inches thick, molded from Nitrile Butadiene Rubber (Buna-N) with a 70 durometer hardness rating. Buna-N is the most widely used O-ring elastomer in trade applications, valued for its excellent resistance to petroleum-based fluids, strong compression set retention, and good tear and abrasion resistance. Each package contains 5 rings and meets SAE and MIL-Spec standards. Licensed HVAC technicians, plumbers, and industrial maintenance professionals rely on this compound for sealing applications involving oils, fuels, and hydraulic fluids.

This O-ring is suited for use in residential and commercial plumbing, HVAC refrigerant and oil circuits, hydraulic systems, and general fluid-handling assemblies where petroleum product compatibility is required. The round cross-section design seats reliably in standard O-ring grooves machined to Dash 425 dimensions. Operating temperature range runs from -40 degrees F to 250 degrees F, making it appropriate for a wide range of indoor mechanical and fluid system environments. It is not FDA approved and should not be used in food-contact or medical applications.

Key Features

• Buna-N compound provides excellent resistance to petroleum products including oils, fuels, and hydraulic fluids
• 70 durometer hardness rating — hard classification for reliable compression set performance
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross-section seats consistently in standard Dash 425 machined grooves
• Meets SAE and MIL-Spec standards
• Pack of 5 rings; minimum order quantity of 1 pack

Compatibility

Designed for use with petroleum-based fluids. Compatible with standard Dash 425 O-ring groove dimensions per SAE and MIL-Spec specifications. Store away from direct sunlight, ozone-generating equipment such as electric motors, and UV sources to preserve elastomer integrity.

Installation Notes

Installation is performed by plumbers, HVAC technicians, or industrial mechanics depending on the application. Always depressurize and de-energize the system before removing or replacing O-rings. Lubricate the ring lightly with a compatible fluid or O-ring lubricant before seating to prevent tearing during assembly. Avoid using sharp tools that may nick the sealing surface or distort the cross-section.