High quality FKM shaft seal ring suitable for crankshaft bearing for Minarelli CW, MA, MY, CA, CY engines. br> br> Inner diameter: 20mm br> Outer diameter: 42/43mm (conical) br> Thickness/depth: 8/9mm (conical) Explanation difference FPM, FKM, FKM®: Behind the abbreviations or names mentioned is the identical basic material fluororubber. FKM is the abbreviation for fluoroelastomers according to the American ASTM standard. FKM®, on the other hand, is a trademark of DuPont Performance Elastomers. In our range, all fluororubber articles are designated by the abbreviation FKM.AI-translation