STIHL 1123 664 1605 Chain Adjustment Screw – Genuine Chain Tensioner Screw

The Genuine STIHL 1123 664 1605 Chain Adjustment Screw is the OEM chain tensioning screw used on selected STIHL chainsaws.

This screw works in conjunction with the chain tensioner mechanism to precisely adjust chain tension along the guide bar. A worn or damaged adjuster screw can result in improper chain tension, premature bar wear, or unsafe operation.

Designed to STIHL factory specifications, this genuine part ensures smooth, accurate chain adjustment and long service life — essential for both professional arborists and domestic users.

Purpose

• Adjusts chain tension along the guide bar
• Ensures safe and correct chain operation
• Prevents excessive chain slack or overtension

Models It Fits

Commonly fitted to selected STIHL chainsaws including:

• STIHL MS170
• STIHL MS180
• STIHL MS210
• STIHL MS230
• STIHL MS250