This Oregon 18-Inch Replacement Chainsaw Bar and Chain lets you refresh your chainsaw's most fundamental parts with a single purchase. Made to fit a variety of Husqvarna models, the M72 chain features an 72 drive link chain with .325-inch pitch and .050-inch gauge. These specifications make it perfect for jobs that call for maximum speed and efficiency, especially when using small to mid-sized saws. The low-vibration chain offers excellent performance, easy maintenance and low kickback for enhanced safety, while the Micro Chisel cutters' small-radius working corners promise excellent performance on hardwood and easier maintenance. For saw sizes up to 55 cc. This saw chain meets the kickback performance requirement of ANSI B175.1-2012. Features LubriTec - Oregon's next-generation oiling system, designed to extend the guide bar and saw chain life. Compatible with a wide range of Husqvarna models, including (but not limited to): 435, 440, 545, 345, 350, 51, 55 RANCHER 550XP Saw chain identification: Always refer to the number stamped on the drive link of your old chain to assure correct gauge and pitch, or refer to your owner’s manual, to order the correct part to fit your saw chain. Chain gauge is the drive link's thickness where it fits into the guide bar groove, matching the guide bar gauge Chain pitch is the size of the chain and is defined as the distance between any three consecutive rivets divided by 2 Your guide bar length is stated in the manual, and is the length of the long bar from end to tip (not the full length of the chainsaw). See Oregon’s fitting guide.