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Buna O-Ring, 90A Durometer, Round, Black

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Product Specifications
Material Type
Nitrile Rubber
Color Name
Black
Brand Name
Small Parts
Cross Section Shape
Round
Upper Temperature Range
250  Degrees Fahrenheit
Specification Met
AS568A
Hardness
90 A Durometer
UNSPSC Code
31410000
LowerTemperature Range
-30  Degrees Fahrenheit
System of Measurement
Inch

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Currently showing 1-20 of 634 Next 20 »
001 1/32" 3/32" 1/32" 0.029"   0.040" 1000 B00M90AR6G Usually ships in 2 to 3 weeks $10.35 Buy Options
001 1/32" 3/32" 1/32" 0.029" 0.109" 0.04" 100 B0051XYKV6 yes $2.24 Buy Options
002 3/64" 9/64" 3/64" 0.042"   0.050" 1000 B00M90AR7A Usually ships in 2 to 3 weeks $10.14 Buy Options
002 3/64" 9/64" 3/64" 0.042" 0.142" 0.05" 100 B0051XYKY8 yes $2.89 Buy Options
003 1/16" 3/16" 1/16" 0.056"   0.060" 1000 B00M90AR7U Usually ships in 2 to 3 weeks $10.14 Buy Options
003 1/16" 3/16" 1/16" 0.056" 0.176" 0.06" 100 B0051XYL2E yes $4.82 Buy Options
004 5/64" 13/64" 1/16" 0.070"   0.070" 1000 B00M90AONW Usually ships in 2 to 3 weeks $10.14 Buy Options
004 5/64" 13/64" 1/16" 0.07" 0.21" 0.07" 100 B0051XYL8S yes $4.40 Buy Options
005 3/32" 7/32" 1/16" 0.101"   0.070" 1000 B00M90AP0E Usually ships in 2 to 3 weeks $9.01 Buy Options
005 3/32" 7/32" 1/16" 0.101" 0.241" 0.07" 100 B0051XYLAG yes $3.13 Buy Options
006 1/8" 1/4" 1/16" 0.114"   0.070" 1000 B00M90AOY6 Usually ships in 2 to 3 weeks $9.72 Buy Options
006 1/8" 1/4" 1/16" 0.114" 0.254" 0.07" 100 B0051XYLDI yes $4.33 Buy Options
007 5/32" 9/32" 1/16" 0.145"   0.070" 1000 B00M90AOMS Usually ships in 2 to 3 weeks $9.54 Buy Options
007 5/32" 9/32" 1/16" 0.145" 0.285" 0.07" 100 B0051XYLI8 yes $2.32 Buy Options
008 3/16" 5/16" 1/16" 0.176"   0.070" 1000 B00M90AOLY Usually ships in 2 to 3 weeks $9.54 Buy Options
008 3/16" 5/16" 1/16" 0.176" 0.316" 0.07" 100 B0051XYLK6 yes $3.75 Buy Options
009 7/32" 11/32" 1/16" 0.208"   0.070" 1000 B00M90ALOY Usually ships in 2 to 3 weeks $9.54 Buy Options
009 7/32" 11/32" 1/16" 0.208" 0.348" 0.07" 100 B0051XYLO2 yes $3.52 Buy Options
010 1/4" 3/8" 1/16" 0.239"   0.070" 1000 B00M90ALJE Usually ships in 2 to 3 weeks $9.54 Buy Options
010 1/4" 3/8" 1/16" 0.239" 0.379" 0.07" 100 B0051XYLSS yes $4.33 Buy Options

Key Features

  • Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids from petroleum to aliphatic hydrocarbons
  • Durometer (hardness) of 90A for resistance to penetration
  • Round cross-section to provide a seal between cylindrical overlapping surfaces
  • For use across a wide temperature range from -30 degrees F/-34 degrees C to 250 degrees F/121 degrees C
  • Meets standards defined by Aerospace Standard AS568A

Product Description

This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of 90A. It has a round cross-section and can be used across a wide temperature range (-30 degrees F/-34 degrees C to 250 degrees F/121 degrees C). Designed for use in a wide variety of sealing applications, this Buna-nitrile O-ring meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.

Buna-nitrile can have high tensile strength, and has abrasion, tear, and compression set resistance. It is compatible for use with petroleum, hexafluoroacetone (HFA), hexafluoro-2-butyne (HFB) and hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering, and should not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.

The durometer hardness of this Buna O-ring is 90A. Durometers measure 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, a value of 0 indicates that a sample was completely penetrated, while a value of 100 shows no indentation in the sample. The letter following the number identifies the shore scale, which is either shore A or D. Shore A is used for softer plastics, while shore D is used for harder plastics.

O-rings 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. O-rings are available in various AS568A dash sizes, which is the standardized sizing for O-rings, and defines the nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter of an O-ring.

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