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

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

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2 mm 4 mm 1 mm 100 B00595IRTW yes $8.37 Buy Options
2.5 mm 4.5 mm 1 mm 100 B00595IU1M yes $4.63 Buy Options
3 mm 5 mm 1 mm 100 B00595JCGY yes $8.55 Buy Options
4 mm 6 mm 1 mm 100 B00595JDSQ yes $9.54 Buy Options
5 mm 7 mm 1 mm 100 B00595JF7A yes $4.93 Buy Options
6 mm 8 mm 1 mm 100 B00595JHMI yes $9.17 Buy Options
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8 mm 10 mm 1 mm 100 B00595JLV0 yes $8.39 Buy Options
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12 mm 14 mm 1 mm 100 B00595I0YY yes $9.07 Buy Options
13 mm 15 mm 1 mm 100 B00595I4YA yes $3.97 Buy Options
14 mm 16 mm 1 mm 100 B00595I922 yes $7.00 Buy Options
15 mm 17 mm 1 mm 50 B00595IBKC yes $12.29 Buy Options
16 mm 18 mm 1 mm 100 B00595IEJA yes $9.10 Buy Options
17 mm 19 mm 1 mm 100 B00595II50 yes $5.15 Buy Options
18 mm 20 mm 1 mm 100 B00595ILKM yes $8.75 Buy Options
19 mm 21 mm 1 mm 100 B00595IPG2 yes $12.64 Buy Options
20 mm 22 mm 1 mm 100 B00595IWLU yes $11.38 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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