Value Collection ZMSCH70252 O-ring Dash 252 Buna-n 70A 10-pack

Product Description

The VALUE COLLECTION ZMSCH70252 is a Dash 252 Buna-N (Nitrile Butadiene Rubber) O-ring with a round cross section, sold in a pack of 10. It measures 5.25 inches inside diameter, 5.5 inches outside diameter, and 0.125 inches thick. With a 70 Shore A hardness rating, this O-ring delivers firm compression set resistance and reliable sealing in static and dynamic applications. Buna-N is the most widely used O-ring elastomer in the trade, offering strong resistance to petroleum-based fluids, hydraulic oils, and fuels. Black in color, it is rated for temperatures from -40 degrees F to 250 degrees F, making it suitable for a broad range of operating conditions.

This O-ring is used across HVAC, plumbing, hydraulics, and general mechanical service wherever a Dash 252 O-ring is required to seal against petroleum products or lubricating oils. Common applications include pump housings, valve bodies, pipe fittings, compressor ports, and fluid connectors. The 10-piece pack suits both single-job repairs and stocking for ongoing maintenance. It meets SAE and MIL-Spec standards, supporting use in commercial and industrial environments.

Key Features

• Buna-N (Nitrile Butadiene Rubber) material — excellent resistance to petroleum products and hydraulic fluids
• Dash 252 designation: 5.25 inches ID, 5.5 inches OD, 0.125 inches thick
• 70 Shore A hardness — hard rating for reliable compression set performance
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross section for consistent sealing under compression
• Meets SAE and MIL-Spec standards
• Pack of 10 per order

Compatibility

Designed as a standard Dash 252 O-ring replacement compatible with petroleum-based fluid systems. Not recommended for exposure to ozone sources, direct sunlight during storage, or applications requiring FDA-compliant materials.

Installation Notes

O-ring installation is performed by plumbers, HVAC technicians, and mechanical service professionals. Always depressurize and drain the system before replacing any O-ring. Lightly lubricate the O-ring with a compatible fluid prior to seating to prevent twisting or tearing during installation. Do not store Buna-N O-rings near motors, electrical equipment, or in direct sunlight, as ozone exposure degrades the elastomer.