You have to determine the pitch (size of a chainsaw backlink). You can find a a number of types of chains, which have unique pitches. You'll be able to Have a look over a chain hyperlink to locate a code digit. It is located around the outer facet of depth http://sethjqtkf.blogkoo.com/5-essential-elements-for-how-to-measure-stihl-chainsaw-blade-length-13035278