Buna/Nitrile O-Rings, 70A Durometer, Black, Pack of 5

This black Buna-nitrile O-ring is designed for use in a wide variety of sealing applications. It has a round cross-section and a durometer of 70A, which indicates its resistance to permanent indentation. Buna-nitrile, also known as Buna-N, is a material that can have high tensile strength, as well as abrasion, tear, and compression set resistance.

The temperature range for this O-ring is -30 degrees Fahrenheit (-34 degrees Celsius) to 250 degrees Fahrenheit (121 degrees Celsius), making it suitable for use in various environments. It is compatible with petroleum, HFA, HFB and HFC fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons.

However, Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight, and weathering. Therefore, it should not be used in ozone-generating electric motors, welding equipment, or applications with exposure to UV light.

O-rings commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces, and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross-section and a hole in the center, similar to a doughnut.

These Buna-nitrile O-rings meet the standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings. They are available in various sizes, and can be ordered based on the required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.

The versatility of these O-rings allows them to perform well in a variety of applications, including petroleum-based oils and fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, dilute acids, and water at temperatures below 100 degrees Celsius (212 degrees Fahrenheit).

With a durometer of 70A, these O-rings offer resistance to penetration, ensuring a reliable seal in various sealing applications. The specific size of this O-ring meets the standards defined by AS568A, with a nominal ID of 1-1/4, a nominal OD of 1-1/2, and a nominal CS of 1/8.

In summary, this black Buna-nitrile O-ring is a versatile, durable, and temperature-resistant solution for a wide range of sealing applications, while meeting the industry-standard specifications set by Aerospace Standard AS568A.

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