Specifying O-rings for increased life and reliability
Years of experience have been captured in a plethora of O-rings design standards and a wealth of materials is readily available to suit most application requirements. Mick Holland describes how to take advantage of these standards to mitigate risk when specifying O-rings into your fluid sealing system.
Within the O-ring industry, size references are often referred to a ‘dash size’. These numbers specify the size and tolerances applied to the humble toroidal O-ring. Briefly glancing at size reference tables reveals a myriad of apparently random O-ring dimensions that do not appear to conform to any logical pattern. However, there is reason behind these sizes and a basic understanding can help a design engineer specify a robust solution that minimises through the selection of readily available hardware and seal components and manufacturing time, by minimising the machining requirements