Value Collection ZMSCH70246 O-ring 4.5in Id Nbr Dash 246

Product Description

The VALUE COLLECTION ZMSCH70246 is a Dash 246 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer for sealing applications involving petroleum-based fluids. With a 4.5-inch inside diameter, 4.75-inch outside diameter, and 0.125-inch cross-section thickness, this ring seats into standard Dash 246 grooves. The round cross-section profile provides consistent radial compression, delivering reliable sealing across a broad temperature range from -40 degrees F to 250 degrees F. Rated at 70 durometer hardness, it resists compression set, tearing, and abrasion under normal service conditions. Each package contains 25 pieces, meeting SAE and MIL-Spec standards.

This O-ring is suited for hydraulic systems, pneumatic assemblies, fuel systems, plumbing connections, and general-purpose sealing applications where petroleum product compatibility is required. It performs in both static and dynamic sealing configurations. HVAC technicians, plumbers, and industrial maintenance professionals commonly use Dash 246 O-rings during pump rebuilds, valve servicing, and manifold assembly. The Buna-N compound is appropriate for mineral-based oils, diesel, and gasoline service. It is not recommended for applications involving ozone, strong oxidizing agents, ketones, or esters.

Key Features

• Buna-N (Nitrile) material with excellent resistance to petroleum products and fuels
• Dash 246 standard sizing: 4.5 inches ID, 4.75 inches OD, 0.125 inches thick
• 70 durometer hardness rating for firm sealing with good compression set resistance
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross-section profile for consistent groove fit and radial seal
• Meets SAE and MIL-Spec standards; sold in a 25-piece package

Compatibility

Designed as an OEM-style replacement for standard Dash 246 O-ring applications compatible with petroleum products, mineral-based hydraulic fluids, and fuels in static and dynamic sealing assemblies.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or qualified maintenance personnel. Always depressurize and isolate the system before removing the old O-ring. Lightly lubricate the O-ring with a compatible fluid or O-ring lubricant before seating to prevent pinching or tearing during assembly. Do not store O-rings in direct sunlight or near motors and electrical equipment that may generate ozone, as ozone exposure degrades Buna-N rubber over time.