FKM O-Rings

Fluorocarbon Elastomer (FKM) O-rings are reliable sealings for applications that require very good ozone, weather and aging resistance, that need to resist harsh conditions and/or exposure to various chemicals. Fluorocarbon elastomers have excellent resistance to oils, aliphatic carbon hydrides, common hydraulic liquids, fuels and other organic solvents and chemicals. FKM sealings are typically used in fuel systems, hydraulics, high vacuum systems and other applications where reliability, conformity and approvals are a prerequisite.

AS568 is the size standard for O-rings from the Society of Automotive Engineers (SAE). It specifies the inside diameters, cross-sections, tolerances, and size identification numbers for O-rings used in sealing applications. The British Standard BS1806 was issued by the British Standards Institution as an O-ring size guide. It lists all imperial standard sizes and includes the 5 main cross section groups in AS568 plus other “intermediate” sizes. BS1806 has been superseded by ISO-3601, but is still widely used as a cross reference for the identification and selection of O-rings.

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