In most chainsaw conversion charts, the chainsaw brand name is listed horizontally across the top line of the chart. Identify your model of chainsaw beneath the appropriate brand name, and move across the chart horizontally to find the corresponding information under the Oregon Chain column. The number in this column represents the appropriate chain for your saw. Locate special features, such as pitch, gauge and cutter type, in the top horizontal line.
Pitch, gauge and chain length are the most important measurements for replacing a chainsaw chain. Pitch tells you the size of the chain. Determine chain pitch by dividing the distance between three consecutive rivets by two. Locate details about the pitch of the chain in the first column of the conversion chart. Find information on chainsaw gauge, which is the drive link's thickness in the guide-bar groove, in the second column of the chart. Calculate length by determining the number of drive links in your chain.
The Oregon chainsaw conversion chart contains information about brand-name saws from Husqvarna, Carlton, McCulloch, Stihl and Dolmar. Many consumer versions of these saw brands use low-profile chains. If you own a Stihl chainsaw, locate information on pitch, gauge and length on the side of the chain. The first of the three numbers refers to the pitch and the second to the gauge, while other markings refer to cutter type, cutter shape or special features of the chain.
Calculate the size and length of your existing chain before replacing it, as factory-installed chain lengths may differ. Service your chain regularly, sharpening it when necessary. Oregon Products recommends checking for broken parts on the chain before sharpening it. Replace the entire chain if parts are bent or broken.