This PTFE O-Ring has a diameter of  mm and is White in color. The hardness of this Back-up Ring 381.71x391.01x1.7 - PTFE - Spiral - 59 Shore D - White - ORS277658 is 59 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 -200 to 260. O-Rings 524960 are referred to as 277658 and have a DIN 3771 size of . This item is equivalent to and has an approval. The chemical name of this O-Ring is Polytetrafluoronthylene.