Chainsaw 1123 007 1000 Chain Tensioner Adjuster Kit - For Stihl 019T 021 023 025 MS210 MS230 MS250 Chainsaw
Chainsaw chain tensioner adjuster assembly with metal gear and screw for Stihl MS series models.
Chainsaw chain tensioner adjuster assembly showing 55.86mm size measurement for 1123 007 1000 replacement.
Chain tensioner kit components and assembled adjuster mechanism for Stihl chainsaws.
Chain tensioner adjuster kit 1123 007 1000 for Stihl chainsaws with compatibility chart and chainsaw illustration.
Close-up detail shots of chainsaw chain tensioner kit 1123 007 1000 showing durable metal and plastic components.
Upgraded chain tensioner adjuster kit 1123 007 1000 for chainsaw side-access adjustment.
Chainsaw chain tensioner kit components shown with repair symptoms for compatible Stihl chainsaw models.
Comparison chart showing BlueStars chainsaw chain tensioner kit durability versus standard replacement parts.
Replacement chainsaw chain tensioner assembly with adjuster screw, gear, and mounting hardware for Stihl models.
Chainsaw chain tensioner adjuster assembly with metal gear and screw for Stihl MS series models.
Chainsaw chain tensioner adjuster assembly showing 55.86mm size measurement for 1123 007 1000 replacement.
Chain tensioner kit components and assembled adjuster mechanism for Stihl chainsaws.
Chain tensioner adjuster kit 1123 007 1000 for Stihl chainsaws with compatibility chart and chainsaw illustration.
Close-up detail shots of chainsaw chain tensioner kit 1123 007 1000 showing durable metal and plastic components.
Upgraded chain tensioner adjuster kit 1123 007 1000 for chainsaw side-access adjustment.
Chainsaw chain tensioner kit components shown with repair symptoms for compatible Stihl chainsaw models.
Comparison chart showing BlueStars chainsaw chain tensioner kit durability versus standard replacement parts.
Replacement chainsaw chain tensioner assembly with adjuster screw, gear, and mounting hardware for Stihl models.
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1123 007 1000 Chain Tensioner Adjuster Kit - For Stihl 019T 021 023 025 MS210 MS230 MS250 Chainsaw

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1123 007 1000 Chain Tensioner Adjuster Kit

Key Features

  • Complete assembly for precise chain tension adjustment.
  • Includes tensioner screw, slide, and required mounting nuts.
  • Constructed from durable materials for reliable operation under engine vibration.
  • Engineered for consistent fitment and mechanical alignment.

Replaces / Cross-Reference Part Numbers

  • 1123-007-1000
  • 11230071000

Compatibility & Fitment

  • Stihl Chainsaws: 019T, 021, 023, 025, MS171, MS180, MS181, MS190T, MS191T, MS210, MS211, MS230, MS250.
  • Stihl Electric Saws: E160.
  • Verify your specific model serial number prior to purchase to ensure compatibility.

When to Replace

  • Difficulty adjusting chain tension or the adjustment screw spinning freely.
  • Visible stripping or wear on the tensioner screw threads.
  • Binding or failure of the tensioner slide to move the guide bar.
  • Missing or damaged mounting hardware that prevents the bar from being held securely.

Installation Tips

  • Ensure the chainsaw is turned off and the spark plug wire is disconnected before servicing.
  • Clean the bar mounting area of wood chips and oil debris to ensure smooth slide movement.
  • Lightly lubricate the tensioner screw threads to reduce friction during adjustment.
  • Align the tensioner pin carefully with the hole in the guide bar before tightening the side cover nuts.
  • Do not overtighten, as this may damage the adjustment mechanism or lead to excessive chain wear.

FAQ

This kit is compatible with a wide range of Stihl chainsaws, including the 017, 018, 019T, 021, 023, 025, MS170, MS171, MS180, MS181, MS190T, MS191T, MS210, MS211, MS230, MS250, MSE140C, MSE160C, MSE180C, MSE200C, E140, E160, and E180C.
This kit replaces OEM part number 1123 007 1000 (also written as 1123-007-1000 or 11230071000).
You likely need a new tensioner if you notice the chain repeatedly loosening during operation, if the tensioning screw feels stripped or spins without moving the bar, or if the tensioner pin has snapped off, preventing the bar from being held in place.
Installation is straightforward and typically takes about 10–15 minutes. You will need a screwdriver to remove the side cover and a small punch or needle-nose pliers to remove the retaining clip or pin holding the old tensioner in place. Ensure the bar is removed before attempting to swap the assembly.
Keep the area around the tensioner clean of wood chips and debris, as buildup can force the tensioner out of alignment. Additionally, avoid over-tightening the chain; the chain should be snug against the bottom of the bar but still able to be pulled around the bar by hand with moderate resistance.