523046X Oregon® Chainsaw Sprocket 3/8 Pitch Rim system
This Oregon Replacement sprocket, compatible with Stihl 017, 018, 021, 023, 025, MS210, MS230, MS250, and MS250C saw models, easily converts to pro style 3/8 pitch for long life cutting. Featuring a 7 tooth rim and fits crank shaft with a 0.3937 diameter.
OREGON rim sprocket system. This sprocket system consists of two components: Clutch cup with splined hub, and a free-floating rim. It is only the rim that makes contact with your saw chain as it is driven around your guide bar. Rim-type sprocket systems are favored by those who want the ultimate in performance and durability. Available for most chain saws applications. This sprocket system does not come with bearing.