O"" Ring - Buna

O"" Ring - Buna

This is a general-purpose sealing O-ring conforming to the AS568-256 standard size. Manufactured from 70 durometer Buna-N (Nitrile) rubber, it is designed for use in a wide range of static and dynamic applications. Its material composition offers excellent resistance to petroleum-based oils, hydraulic fluids, gasoline, and water, making it a common replacement part for sealing hydraulic pumps, valves, cylinders, and fittings in various concrete mixer systems.

Key Features

• Conforms to AS568-256 universal size standard.
• Made from Buna-N (Nitrile) for excellent resistance to petroleum oils and hydrocarbon fuels.
• 70 durometer hardness provides a balance of flexibility and resistance to extrusion.
• Suitable for a temperature range of -40°F to +250°F.
• Commonly used for general-purpose sealing in hydraulic and pneumatic systems.

Fits These Mixers

McNeilus, Terex, Con-Tech. This is a universal standard-size O-ring used across multiple general applications in concrete mixers, including hydraulic and water systems. Compatibility is based on matching the AS568-256 size requirement rather than a specific mixer model.

All measurements ± standard manufacturing tolerance.

Product descriptions are drafted with automated tools and reviewed as time allows. While we work to keep them accurate, specifications and fitment should be confirmed with a Customer Service specialist at 800-745-3414 before purchase. Found an error? Let us know and we’ll fix it.