The Genuine Husqvarna 503625904 Clutch Drum Assembly is a professional-grade rim sprocket system. This complete OEM kit includes the clutch drum, a 7-tooth .404" rim sprocket, and the needle bearing.
Unlike fixed spur sprockets, this rim-style system allows the chain to align itself perfectly with the bar groove, reducing friction and extending the life of your cutting gear. This assembly is built to handle the high-torque demands of Husqvarna's largest professional saws.
This assembly is ONLY for .404" pitch chains.