This HPU O-Ring has a diameter of  mm and is Blue in color. The hardness of this Back-up Ring 25.5x28.4x1 - HPU - Closed - 57 Shore D - Blue - ORS274776 is 57 Shore D. Alternative names for the compound are , and it is commonly produced by . The O-Ring is typically used in and has an operating temperature range from -30 to 125. O-Rings 6551408 are referred to as 274776 and have a DIN 3771 size of . This item is equivalent to and has an approval. The chemical name of this O-Ring is Hydrolysis Resistant Thermoplastic Polyurethane.