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

Available in multiple versions

4.8 out of 5 stars 35 customer reviews

Price: $0.97 - $646.87
Product Specifications
Brand Name Small Parts
Material Type Nitrile Rubber
Hardness 70 A Durometer
System of Measurement Metric
Color Black
Cross Section Shape Round
Nominal Inside Diameter n/a  mm
Nominal Outside Diameter n/a  mm
Nominal Width n/a  mm
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Durometer 70a
Outside Diameter n/a  mm
Size n/a
UNSPSC Code 31410000

Currently showing 1-20 of 419 Next »
ASIN
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Inside Diameter Number of Items Each Price Quantity
   
B000FMWKO2 6 millimeters 100 $0.13 ea.
$13.46
B00595JLV0 8 millimeters 100 $0.15 ea.
$15.49
B00595LHZ8 7 millimeters 100 $0.15 ea.
$14.76
B00595QS6Q 5 millimeters 100 $0.13 ea.
$12.78
B000FMWL7I 5.3 millimeters 100 $0.15 ea.
$14.97
B000FMUR88 5.6 millimeters 100 $0.10 ea.
$9.94
B00595LJOM 7.5 millimeters 100 $0.13 ea.
$12.63
B00595MKZE 6.8 millimeters 100 $0.14 ea.
$13.85
B00595WAP4 94 millimeters 15 $0.35 ea.
$5.19
+ Shipping
B005962GXO 90 millimeters 10 $1.86 ea.
$18.61
B00595X37I 94.4 millimeters 10 $0.78 ea.
$7.80
B00595X4JU 99.4 millimeters 10 $1.51 ea.
$15.11
B00595RDME 102 millimeters 15 $1.14 ea.
$17.15
B00595JNFY 9 millimeters 100 $0.16 ea.
$15.63
B00595JOCQ 9.5 millimeters 100 $0.04 ea.
$4.12
+ Shipping
B00595LLJK 8 millimeters 100 $0.13 ea.
$13.11
B00595OAEI 7 millimeters 100 $0.16 ea.
$16.02
B00595QY9W 6 millimeters 100 $0.16 ea.
$16.29
B00595UV2I 5 millimeters 100 $0.18 ea.
$17.87
B00595P7N6 6.3 millimeters 100 $0.05 ea.
$5.11
+ Shipping
Currently showing 1-20 of 419 Next »
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Product 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.


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: B003JMFAYW
  • Average Customer Review: 4.8 out of 5 stars  See all reviews (35 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Inside Diameter: 9.5Outside Diameter: 11Number of Items: 100 Verified Purchase
This is the perfect size o-ring for converting a preppy fountain pen from a cartridge to being an ink dropper pen where the barrel of the pen can be completely filled with ink. It is actually a slightly better fit for the Preppy fountain pen than the 010 Buna-N O-Ring, 70A Durometer, Black, 1/4" ID, 3/8" OD, 1/16" Width o-rings although both will work. Add a small dab of silicone grease to the threads and the converted pen will not leak ink at all. Very effective and inexpensive.
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Inside Diameter: 5Outside Diameter: 8Number of Items: 100 Verified Purchase
I bought these to install on my custom WASD mechanical keyboard to reduce clacking and stroke distance. I could have had WASD install them on my keyboard for $20+, or bought the o-rings from them without installation for $17+, but this seemed more economical.

With the key remover that came with the keyboard, they were very easy to install. It only took me about 30 minutes to do my full sized keyboard. The only tricky part was removing and re-installing the brackets for the larger keys.

This simple mod dramatically improved the feel of my already amazing Cherry MX Blue keys, and reduced the ridiculous amount of noise that they produce.
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Inside Diameter: 24.4Outside Diameter: 30.6Number of Items: 100 Verified Purchase
RELOADERS REJOICE! Are your Hornady Lock N' Load bushings allowing the dies to pop out of your press from time to time? Is it especially problematic for your powder measure? These O-Rings are the answer. Sure Hornady will send you a metal shim that supposedly corrects the "slippage" problem, but these work so much better and actually fixes the problem cheaply once and for all. They are slightly thicker than the standard Hornady O-Ring that come on the bushings and assure a tight fit with no movement. These are the rings Hornady should have used in the first place. And at this price for 100 O-Rings and two day shipping with Amazon Prime... how can you go wrong? Life is too short for "good enough" or "workarounds" Just buy them... you will not regret it.
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Inside Diameter: 3Outside Diameter: 5Number of Items: 100 Verified Purchase
Let's see... Honda only sells this O-ring as part of a $15.00 + parts pack. Yamaha sells one for $1.49. This was a no-brainer. I gave a bunch to a buddy and still have plenty left over. Works as well as the OEM O-Ring I lost during my last carb rebuild. No leaks.
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Inside Diameter: 8Outside Diameter: 12Number of Items: 100 Verified Purchase
Plain and simple these little guys worked. I used 8 of them to replace old flat ones from the carb on my motorcycle. The OEM o-rings are 3-4x as expensive and are the same thing. I would buy them again in a heartbeat, though I doubt I'll need to as i now have an extra 92 of them.
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Inside Diameter: 75Outside Diameter: 81Number of Items: 25 Verified Purchase
When the o-ring failed on our pool diverter valve I could not located a direct replacement as it appeared to be generic. Measured the old one with a caliper and ordered a close size. Worked wonderfully and got a whole pack of replacements for one name brand o-ring cost.
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Inside Diameter: 17.5Outside Diameter: 20.5Number of Items: 100 Verified Purchase
I was very pleased to find this product at a decent price and quick delivery. I needed to replace O-rings on a specialty product and feared it was going to be long and expensive process to find the right ones. This purchase turned out to be easy and inexpensive!
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By Paul R. on October 31, 2012
Inside Diameter: 47Outside Diameter: 53Number of Items: 25 Verified Purchase
Not much to say - they're O-rings. They're the right size and the right material.

They work fine. They were packaged well. They arrived on time.
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