154 Buna-n O-ring, 70a Durometer, Square, Black, 3-3/4" Id, 3-15/16" Od, 3/32 W

US $14.99

Summerville, South Carolina, United States
Jan 30th

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154 Buna-N O-Ring, 70A Durometer, Square, Black, 3-3/4" ID, 3-15/16" OD, 3/32" Width (Pack of 25) 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. 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 Specifications Part Number S1547470 Actual ID 3.737 inches Inside Diameter Tolerance 0.028 inches Actual OD 3.943 inches Actual Width 0.103 inches Width Tolerance 0.003 inches Nominal ID 3.737 inches Nominal OD 3-15/16 inches Nominal Width 0.103 inches Dash Size 154 Outside Diameter 3-15/16 inches Pkg Qty 25 Call us at 1-843-261-9553 / 1-800-961-2124 or contact us via eBay with any questions.