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Buna O-Ring, 70A Durometer, Round, Black (Metric)

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Product Specifications
Nominal Width
n/a  millimeters
Color Name
Material Type
Nitrile Rubber
Outside Diameter
n/a  millimeters
Nominal Inside Diameter
n/a  millimeters
Size Name
Brand Name
Small Parts
Cross Section Shape
Upper Temperature Range
250  Degrees Fahrenheit
70 A Durometer
Nominal Outside Diameter
n/a  millimeters
System of Measurement
LowerTemperature Range
-30  Degrees Fahrenheit

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5 millimeters 100 B00595QS6Q yes $9.64 Buy Options
6 millimeters 100 B000FMWKO2 yes $6.27 Buy Options
7 millimeters 100 B00595LHZ8 yes $8.79 Buy Options
8 millimeters 100 B00595JLV0 yes $8.39 Buy Options
5.3 millimeters 100 B000FMWL7I yes $2.61 Buy Options
5.6 millimeters 100 B000FMUR88 yes $7.25 Buy Options
7.5 millimeters 100 B00595LJOM yes $4.44 Buy Options
6.8 millimeters 100 B00595MKZE yes $10.14 Buy Options
90 millimeters 10 B005962GXO yes $12.82 Buy Options
94 millimeters 15 B00595WAP4 yes $11.36 Buy Options
94.4 millimeters 10 B00595X37I yes $7.41 Buy Options
99.4 millimeters 10 B00595X4JU Usually ships in 2 to 4 weeks $9.33 Buy Options
102 millimeters 15 B00595RDME yes $13.44 Buy Options
5 millimeters 100 B00595UV2I yes $10.19 Buy Options
6 millimeters 100 B00595QY9W yes $10.99 Buy Options
7 millimeters 100 B00595OAEI yes $11.88 Buy Options
8 millimeters 100 B00595LLJK yes $13.11 Buy Options
9 millimeters 100 B00595JNFY yes $9.10 Buy Options
6.3 millimeters 100 B00595P7N6 yes $12.73 Buy Options
8.1 millimeters 100 B00595MBWG yes $11.09 Buy Options

Key Features

  • Made of Buna-nitrile for use with a variety of fluids and hydrocarbons
  • Can be used across a wide temperature range from -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C)
  • Round in cross-section to provide a seal between cylindrical overlapping surfaces
  • Durometer (hardness) of 70A for resistance to penetration

Product Description

This O-ring is made of Buna-nitrile (also called Buna-N), round in cross-section, has a durometer of 70A, and is designed for use in a wide variety of sealing applications.

Buna-nitrile can have high tensile strength, resistance to abrasion, tear, and compression set resistance. It is acceptable for temperature applications between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C). It is compatible for use with petroleum, HFA, HFB, and HFC fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight, and weathering, and should therefore not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.

This O-ring has a shore durometer of 70A. Shore durometer is the hardness of a material, and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100, with 100 indicating no indentation.

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 cylinders of various sorts. They are circular in shape, with a round cross section and a hole in the center, similar to a doughnut. O-rings are available in a number of sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.

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