Compatible with the guide plate sprocket adjusting screws and chain tensioner assembly parts of the STIHL chainsaws 029 039 MS290 MS291 MS310 MS390.

This guide bar adjusting screw set (chain tensioner) was specifically developed for STIHL chainsaws in the 029, 039, MS290, MS291, MS310, and MS390 series. It is an essential component of the chain drive system and consists of an adjusting screw, rack, and mounting base. It replaces defective original tensioners (e.g., due to rust, wear, damaged threads, or breakage) and allows for precise and stepless adjustment of the guide bar position for optimal chain tension and clearance. This ensures maximum cutting performance and user safety.