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This O-ring is made of black Buna-nitrile, is 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, and abrasion, tear, and compression set resistance. It can be used in temperatures between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C), and 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 Buna 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 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 sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.
These Buna-nitrile O-rings meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.
Lee Pettit
2025-09-05 18:22:11
Great product fast shipping great price
Michael J
2025-08-29 17:29:05
After searching high and low for a domestic source for a breech seal for a 25 year old British-made Theoben Sirocco air rifle, I discovered that the company used not a specially designed seal, but rather standard 109 sized high-temp o-rings. This bag of 100 should outlast me.
kd6aaj
2025-08-06 12:55:49
Size 109 BUNA-N o-rings fit the “New Process†NP241C 4x4 Transfer Case Oil Pump Feed Tube, as well as other similar transfer cases. I tried size 108 first, but 108 is too small, so I ordered the size 109.Size 109 is a Perfect fit. They cost about $3 for one o-ring from an online transmission/transfer case shop!
funseeker
2025-08-01 20:36:05
Great product.very durable..would be nice to be able to purchase a smaller amount only needed one.even fifty would be nice
Peter Higson
2025-06-25 14:34:42
Not the correct size but I will use it elsewhere.
DaBurt
2025-06-12 18:09:27
Great price, the same as McMaster Carr but with free shipping.
Private reader
2025-05-26 11:58:22
Fits corny kegs, a good product. I use it on my kegs which I use for my home brewed beer.
Blue Bill
2025-04-19 16:59:26
Bought these for the dip and gas tubes on my ball lock kegs. Screaming good bargain compared to what a lot of homebrew shops charge.
Cain Derickson
2025-02-23 18:47:18
This pack of 100 o-rings was cheaper than buying one quick connector to fix my leaking fridge.I was able to pull apart the water line quick connectors and replace the o-rings hidden inside the existing couplers and it worked flawlessly.My fridge was a GE Profile with water and ice maker.
Mupps
2025-02-21 12:47:31
High quality o-rings at a great price.
Customer
2024-11-29 17:09:25
Perfect. Fast shipping. Thanks
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