Metric O-Ring Kit, Buna-N, Black, 90A Durometer, 30-Sizes (Pack of 386 Pieces)

This metric O-Ring set is made of Black Buna-N, has a durometer of 90A, and includes 386 pieces covering 30 dash sizes. The rings have a Round cross-section and can be used across a wide temperature range from -40 degrees F (-40 degrees C) to 212 degrees F (100 degrees C). The rings come in a plastic storage case designed for organization and portability.The set includes the following O-Rings: 16 pieces for metric sizes (cross section x inside diameter) 2x3, 2x4, 2x5, 2x6, 2x7, 2x8, 2x10; 13 pieces for 2.5x10, 2.5x11, 2.5x12, 2.5x14, 2.5x16, 2.5x17, 2.5x19; 12 pieces for 3x19, 3x20, 3x22, 3x24, 3x25, 3x27, 3x28, 3x30, 3x32, 3x33, 3x35, 3x36, 3x38; 9 pieces for 4x38, 4x41, 4x44.Buna-nitrile can have high tensile strength, as well as 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-N O-Ring is 90A. 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 rubber, 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 as well as Metric sizes. O-ring size is defined by the inside diameter (ID), outisde diameter (OD), and cross-sectional (CS) diameter.What's in the box?16 pieces for metric sizes (cross section x inside diameter) 2x3, 2x4, 2x5, 2x6, 2x7, 2x8, 2x1013 pieces for 2.5x10, 2.5x11, 2.5x12, 2.5x14, 2.5x16, 2.5x17, 2.5x1912 pieces for 3x19, 3x20, 3x22, 3x24, 3x25, 3x27, 3x28, 3x30, 3x32, 3x33, 3x35, 3x36, 3x389 pieces for 4x38, 4x41, 4x44plastic storage case with label to identify sizes

• Made of Buna-nitrile for use with a variety of fluids and hydrocarbons and has a durometer (hardness) of 90A
• Kit includes 386 pieces covering 30 metric sizes
• Plastic case for portability and organized storage
• For use across a wide temperature range from -40 degrees F (-40 degrees C) to 212 degrees F (100 degrees C)