Buna/Nitrile O-Rings, 70A Hardness, Black, 3-3/4 ID, 4-1/8 OD, 3/16 Width (Pack of 5)

This Buna-nitrile O-ring is designed for use in a wide variety of sealing applications. It is round in cross-section and has a durometer of 70A, making it resistant to permanent indentation. Buna-nitrile is a versatile material that can provide high tensile strength, as well as abrasion, tear, and compression set resistance.

The temperature range of this O-ring is -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C), making it compatible for use with a variety of fluids and hydrocarbons, including petroleum, HFA, HFB and HFC fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. However, it is vulnerable to acetone, ethers, esters, ozone, sunlight, and weathering, and should not be used in applications with exposure to these substances, such as ozone-generating electric motors or welding equipment.

The Shore durometer of 70A indicates a high resistance to indentation on a scale of 0 to 100, with 100 representing no indentation. O-rings commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces, and are commonly found in engines, faucets, flanges, valves, and various cylinders.

These Buna-nitrile O-rings 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. They meet the standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.

With a temperature range of -35°C (-31°F) to 120°C (248°F) and a shelf-life of 15 years, these versatile O-rings 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 to below 100°C (212°F).

In summary, this Buna-nitrile O-ring is a durable and versatile sealing solution, designed to meet the needs of a wide range of applications. Its unique material properties and dimensions make it well-suited for use in a variety of industries and environments.

product information: