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Buna O-Ring, 70A Durometer, Square, Black

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

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Currently showing 1-20 of 207 Next 20 »
006 1/8" 1/4" 1/16" 0.114" 0.254" 0.07" 100 B0051XZD62 1 $25.40 Buy Options
007 5/32" 9/32" 1/16" 0.145" 0.285" 0.07" 100 B0051XZD76 2 $9.43 Buy Options
008 3/16" 5/16" 1/16" 0.176" 0.316" 0.07" 100 B0051XZD8A 2 $17.32 Buy Options
009 7/32" 11/32" 1/16" 0.208" 0.348" 0.07" 100 B0051XZD94 2 $26.84 Buy Options
010 1/4" 3/8" 1/16" 0.239" 0.379" 0.07" 100 B0051XZD9E 2 $9.43 Buy Options
012 3/8" 1/2" 1/16" 0.364" 0.504" 0.07" 100 B0051XZDAI 1 $9.43 Buy Options
013 7/16" 9/16" 1/16" 0.426" 0.566" 0.07" 100 B0051XZDBC Usually ships in 3 to 5 weeks $9.61 Buy Options
014 1/2" 5/8" 1/16" 0.489" 0.629" 0.07" 100 B0051XZDBM 2 $14.36 Buy Options
015 9/16" 11/16" 1/16" 0.551" 0.691" 0.07" 100 B0051XZDCQ 1 $14.08 Buy Options
016 5/8" 3/4" 1/16" 0.614" 0.754" 0.07" 100 B0051XZDDA 3 $12.11 Buy Options
018 3/4" 7/8" 1/16" 0.739" 0.879" 0.07" 100 B0051XZDLW 3 $13.90 Buy Options
019 13/16" 15/16" 1/16" 0.801" 0.941" 0.07" 100 B0051XZDMQ 2 $12.99 Buy Options
020 7/8" 1" 1/16" 0.864" 1.004" 0.07" 100 B0051XZDNU 1 $13.39 Buy Options
021 15/16" 1-1/16" 1/16" 0.926" 1.066" 0.07" 100 B0051XZDPI 3 $14.34 Buy Options
023 1-1/16" 1-3/16" 1/16" 1.051" 1.191" 0.07" 100 B0051XZDUS 3 $6.76 Buy Options
024 1-1/8" 1-1/4" 1/16" 1.114" 1.254" 0.07" 100 B0051XZDWG 1 $4.27 Buy Options
025 1-3/16" 1-5/16" 1/16" 1.176" 1.316" 0.07" 100 B0051XZDXK 2 $13.97 Buy Options
026 1-1/4" 1-3/8" 1/16" 1.239" 1.379" 0.07" 100 B0051XZDYO 5 $15.22 Buy Options
027 1-5/16" 1-7/16" 1/16" 1.301" 1.441" 0.07" 100 B0051XZDZ8 1 $14.12 Buy Options
028 1-3/8" 1-1/2" 1/16" 1.364" 1.504" 0.07" 100 B0051XZDZI 1 $13.80 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 70A for resistance to penetration
  • Square cross-section to provide a static seal under high pressure
  • 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 70A. It has a square 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 square O-ring can provide a superior seal to round O-rings in static applications, but is usually not as effective in dynamic 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 70A. 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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