This FKM - FPM - Viton O-Ring has a diameter of 56x6.99 mm and is Black - Translucent in color. The hardness of this O-ring 56x6.99 - FEP-FKM - FDA - ORS166325 is . Alternative names for the compound are Viton® - FKM, and it is commonly produced by Viton® | Tecnoflon® | Fluorel® | Dai-El® | Fluon®. The O-Ring is typically used in and has an operating temperature range from -20 ºC to 205 ºC. O-Rings 540606 are referred to as 166325 and have a DIN 3771 size of 56x6.99. This item is equivalent to and has an DOF approval. The chemical name of this O-Ring is Fluorcarbonrubber / Fluorrubber / Fluorpolymeer-elastomeer.