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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.
Josh J
Reviewed in the United States on October 27, 2023
Replacement o-rings for my Hydrospace intercooler end caps. No more leaks.
DJ T.
Reviewed in Canada on May 21, 2022
Couldnt get just the orings from any supplier or manufacturer of Boshart BII premium yard hydrant but these were the perfect match n saved me tons of money and wasted time searching
Customer
Reviewed in Canada on July 26, 2021
You probably don't need 100 of these but can't be the price with shipping compared to just a pair from OEM
Don
Reviewed in Canada on January 22, 2020
Better than buying a new kit for my yard hydrant. Just needed new o-rings.
David J Simmons
Reviewed in the United States on September 29, 2019
On time and as advertised. I have an older Craftsman floor jack that tends to eat o-rings on the rear seal of the smaller of the two lift pistons - the high speed one. These o-rings are pretty hard to find from the local sources, unless o-rings are their specialty. This size has an unusually thick cross section for its overall diameter and is therefore missing from most kits. You can buy a whole jack rebuild kit, but that costs a lot more than the one o-ring that always gets damaged, even if you get 99 extras.
CDub
Reviewed in the United States on June 20, 2018
Worked great to fix the bobbin drive on my sewing machine. Dunno if it would hold back liquids.
RonDel
Reviewed in Canada on August 24, 2017
great price
Kindle Customer
Reviewed in the United States on December 26, 2016
Nothing much to say. These o-rings are a standard item. Used to repair my Perlick tap.
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