Value Collection ZMSCH70245 O-ring Dash 245 Nbr 70 Duro

Product Description

The VALUE COLLECTION ZMSCH70245 is a Dash 245 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 4.375 inches inside diameter by 4.625 inches outside diameter with a 0.125 inch cross-section thickness. The round cross-section profile seats consistently in standard AN/MS O-ring grooves. With a Shore A hardness of 70 and a working temperature range of -40 degrees F to 250 degrees F, this ring is suited for hydraulic, pneumatic, and fluid system sealing tasks handled by HVAC technicians, plumbers, and industrial maintenance professionals.

This O-ring is appropriate for use in petroleum-based fluid systems, hydraulic circuits, water service lines, and compressed air applications where Buna-N compatibility is confirmed. It is commonly installed on pump housings, valve bodies, pipe flanges, and threaded fittings across residential and light commercial mechanical systems. It meets SAE and MIL-Spec standards, making it acceptable in both commercial trade and light industrial maintenance contexts. Sold in packages of 25 units, it suits both single-repair and service-stock purchasing needs.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction offers excellent resistance to petroleum products and hydraulic fluids
• Round cross-section seats reliably in standard Dash 245 O-ring grooves
• Shore A 70 hardness rating provides a firm, durable seal with strong compression set resistance
• Operating range of -40 degrees F to 250 degrees F covers most HVAC and plumbing service conditions
• Meets SAE and MIL-Spec standards for broad application acceptance
• Store away from direct sunlight, ozone sources, and electrical equipment to preserve elastomer integrity

Compatibility

Designed as an OEM-style replacement or service seal for any application calling for a Dash 245 Buna-N O-ring; compatible with petroleum-based fluids, hydraulic oils, and water service media where Nitrile Butadiene Rubber is the specified elastomer.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or hydraulic system technicians depending on the application. Shut off fluid supply and relieve system pressure fully before removing the old seal. Lubricate the O-ring with a compatible fluid or O-ring lubricant before seating to prevent tearing during assembly. Do not stretch or nick the ring during installation, and inspect the groove for burrs or corrosion that could compromise the seal.