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

Available in multiple versions

4.5 out of 5 stars 9 customer reviews

Price: $4.55 - $49.74
Product Specifications
Brand Name Small Parts
Material Type Nitrile Rubber
Hardness 70 A Durometer
System of Measurement Inch
Color Black
Cross Section Shape Square
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Specification Met AS568A
Durometer 70a
UNSPSC Code 31410000

This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of ... See more product details


Currently showing 1-20 of 197 Next »
Size Nominal Inside Diameter Nominal Outside Diameter Nominal Width Inside Diameter Outside Diameter Overall Width Number of Items Part Number
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Price Quantity
   
006 0.114 inches 1/4 inches 0.07 inches 0.114 inches 1/4 inches 0.07 inches 100 B0051XZD62
$26.37
007 0.145 inches 9/32 inches 0.07 inches 0.145 inches 9/32 inches 0.07 inches 100 B0051XZD76
$32.46
008 0.176 inches 5/16 inches 0.07 inches 0.176 inches 5/16 inches 0.07 inches 100 B0051XZD8A
$26.42
009 0.208 inches 11/32 inches 0.07 inches 0.208 inches 11/32 inches 0.07 inches 100 B0051XZD94
$26.37
010 0.239 inches 3/8 inches 0.07 inches 0.239 inches 3/8 inches 0.07 inches 100 B0051XZD9E
$5.30
012 0.364 inches 1/2 inches 0.07 inches 0.364 inches 1/2 inches 0.07 inches 100 B0051XZDAI
$10.48
013 0.426 inches 9/16 inches 0.07 inches 0.426 inches 9/16 inches 0.07 inches 100 B0051XZDBC
$10.68
014 0.489 inches 5/8 inches 0.07 inches 0.489 inches 5/8 inches 0.07 inches 100 B0051XZDBM
$21.29
015 0.551 inches 11/16 inches 0.07 inches 0.551 inches 11/16 inches 0.07 inches 100 B0051XZDCQ
$16.27
016 0.614 inches 3/4 inches 0.07 inches 0.614 inches 3/4 inches 0.07 inches 100 B0051XZDDA
$15.59
018 0.739 inches 7/8 inches 0.07 inches 0.739 inches 7/8 inches 0.07 inches 100 B0051XZDLW
$15.84
019 0.801 inches 15/16 inches 0.07 inches 0.801 inches 15/16 inches 0.07 inches 100 B0051XZDMQ
$15.93
020 0.864 inches 1 inches 0.07 inches 0.864 inches 1 inches 0.07 inches 100 B0051XZDNU
$15.98
022 0.989 inches 1-1/8 inches 0.07 inches 0.989 inches 1-1/8 inches 0.07 inches 100 B0051XZDT4
$17.24
023 1.051 inches 1-3/16 inches 0.07 inches 1.051 inches 1-3/16 inches 0.07 inches 100 B0051XZDUS
$16.25
024 1.114 inches 1-1/4 inches 0.07 inches 1.114 inches 1-1/4 inches 0.07 inches 100 B0051XZDWG
$17.33
025 1.176 inches 1-5/16 inches 0.07 inches 1.176 inches 1-5/16 inches 0.07 inches 100 B0051XZDXK
$17.46
026 1.239 inches 1-3/8 inches 0.07 inches 1.239 inches 1-3/8 inches 0.07 inches 100 B0051XZDYO
$17.60
027 1.301 inches 1-7/16 inches 0.07 inches 1.301 inches 1-7/16 inches 0.07 inches 100 B0051XZDZ8
$20.27
028 1.364 inches 1-1/2 inches 0.07 inches 1.364 inches 1-1/2 inches 0.07 inches 100 B0051XZDZI
$17.78
Currently showing 1-20 of 197 Next »
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Product 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 Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B0052AU17A
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (9 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

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.

Customer Reviews

5 star
67%
4 star
33%
3 star
0%
2 star
0%
1 star
0%
See all 9 customer reviews
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Top Customer Reviews

Size: 020Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 1Inside Diameter: 0.864Nominal Inside Diameter: 0.864Number of Items: 100Nominal Outside Diameter: 1 Verified Purchase
The o-rings are perfect for CD/DVD tray drive belts. The square format fits the grooves perfectly. Being as they come in 100 PC packs, they should last at least until holograms take the place of mechanical drives!
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Size: 325Nominal Width: 0.21Overall Width: 0.21Outside Diameter: 1-7/8Inside Diameter: 1.475Nominal Inside Diameter: 1.475Number of Items: 25Nominal Outside Diameter: 1-7/8 Verified Purchase
These were a good price and there is nothing wrong with them. They are just o-rings though so there isn't much to say about them. I found no defects in any of them though so I guess that is as good as it needs to be.
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Size: 023Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 1-3/16Inside Diameter: 1.051Nominal Inside Diameter: 1.051Number of Items: 100Nominal Outside Diameter: 1-3/16 Verified Purchase
Was exactly what I needed, although I only needed one and had to buy a package of 100. Part was impossible to find in my home city.
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Size: 017Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 13/16Inside Diameter: 0.676Nominal Inside Diameter: 0.676Number of Items: 100Nominal Outside Diameter: 13/16 Verified Purchase
What can one say about o-rings. If you order the right size and it is sent to you, they will fit.
Well, these fit.
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By Dale B on August 27, 2014
Size: 228Nominal Width: 0.139Overall Width: 0.139Outside Diameter: 2-1/2Inside Diameter: 2.234Nominal Inside Diameter: 2.234Number of Items: 25Nominal Outside Diameter: 2-1/2 Verified Purchase
These seals fit my automobile thermostat housing exactly. Good price
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