This HNBR O-Ring has a diameter of 56.52 x 3.53 mm and is Green in color. The hardness of this O-ring 56.52x3.53 - HNBR - 90 Shore A - Red- ORS188111 is 90 Shore A. Alternative names for the compound are Hydrogenated Nitrile Butadiene Rubber, 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 -25 ºC to 150 ºC. O-Rings 1264951 are referred to as 188111 and have a DIN 3771 size of 56.52 x 3.53. This item is equivalent to and has an None approval. The chemical name of this O-Ring is Hydrogenated nitrile rubber.