Japanese Metric O-Ring Kit, Buna-N, Black, 70A Durometer, 30-Sizes (Pack of 391 Pieces)

This metric O-Ring set is made of Black Buna-N, has a durometer of 70A, and includes 391 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: 18 pieces each for JIS B2401 sizes P3, P4, P5, P6, P7, P8, P9; 14 pieces for P10A, P11, P12, P14, P16, P18, P20; 11 pieces for G20, G22, G25, G30, G35, G40, G45; 10 pieces for P22.4, P25, P26, P30, P32, P34, P36, P40, P48.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 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 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?18 pieces each for JIS B2401 sizes P3, P4, P5, P6, P7, P8, P914 pieces for P10A, P11, P12, P14, P16, P18, P2011 pieces for G20, G22, G25, G30, G35, G40, G4510 pieces for P22.4, P25, P26, P30, P32, P34, P36, P40, P48plastic storage case with label to identify sizes

• Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids from petroleum to aliphatic hydrocarbons and has a durometer (hardness) of 70A
• Kit includes 391 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)