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Imperial size o-rings, also known as standard o-rings, are defined as inch-size o-rings and are used primarily by the American marketplace, often as an AS568 (American Standard) o-ring. Most imperial o-rings can be easily crossed to a metric-size version. Find imperial o-rings on our website. If you need assistance crossing from another brand or identifying the correct size for your machine tool, All World’s customer service team is eager to assist.