This FKM - FPM - Viton O-Ring has a diameter of 54.2 x 5.7 mm and is Black in color. The hardness of this O-ring 54.2x5.7 - FKM - FPM - Viton- 80 Shore A - Black - ORS174978 is 80 Shore A. Alternative names for the compound are Viton® - FKM, and it is commonly produced by Viton® - Du Pont - 3M - Solvay - Daikin. The O-Ring is typically used in and has an operating temperature range from -20 ºC to 205 ºC. O-Rings 281661 are referred to as 174978 and have a DIN 3771 size of 54.2 x 5.7. This item is equivalent to and has an None approval. The chemical name of this O-Ring is Fluorocarbon Rubber.