Gear Heads · SKU B0GC4GDY3K

9" Chainsaw Tooth Brush Cutter Blade 20T with Gear Head 4180 640 0114

Name: 9" Chainsaw Tooth Brush Cutter Blade 20T with Gear Head 4180 640 0114
Brand: YUTACOREX
SKU: B0GC4GDY3K

$46

9" Chainsaw Tooth Brush Cutter Blade 20T with Gear Head 4180 640 0114 for Stihl FS56RCE FS91R FS111R FS131R FS94R FS120 - Heavy Duty Trimmer Weed Eater Repla…

Bar length9"

CategoryGear Heads

Part numberB0GC4GDY3K

ConditionNew — aftermarket replacement

What the listing states

Listed as compatible with: Stihl FS56RCE FS91R FS111R FS131R FS94R FS120 - Heavy Duty Trimmer Weed Eater Replacement Kit
Pieces in pack: 1
Included: Trimmer Gear Head and Tooth Brush Blade

From our Amazon listing, checked September 25, 2026. Model and part-number matches are the seller's; confirm against the part on your machine.

Before you buy — how to verify fitment

Measure shaft diameter. Common sizes are 24mm, 25.4mm, and 28mm — check your trimmer manual or measure the drive shaft.
Count the splines. The gear head input must match your shaft spline count (typically 7 or 9).
Check output thread. Verify the thread direction and size for your cutting attachment.
Confirm your trimmer model against the compatibility list above.

Frequently asked questions

How do I know which gear head fits my trimmer?

Match the shaft diameter (typically 24mm, 25.4mm, or 28mm), the number of splines (7 or 9), and the thread direction on the output shaft. Check your trimmer manual for these specs.

Can I replace a gear head myself?

Yes. Remove the old head by loosening the clamp bolt, slide it off the shaft, and slide the new one on. Align the drive shaft splines, tighten the clamp, and check for wobble before running.