Description
4133 642 7601 STIHL Collar Nut Genuine OEM Part
The STIHL Collar Nut (4133 642 7601) is a genuine OEM fastening component designed for secure installation within the drive tube and gear head assemblies of STIHL edgers and Kombi attachments. This collar nut helps ensure proper tightening and alignment of gear head hardware, supporting safe and reliable cutting performance during operation.
Manufactured to STIHLs exact factory specifications, this OEM collar nut provides correct fitment, long-lasting durability, and dependable performance when replacing worn or missing fasteners.
Product Details
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OEM Part Number: 4133 642 7601
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Brand: STIHL (Genuine OEM)
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Part Type: Collar Nut
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Application: Drive Tube Assembly / Gear Head Fastening
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Condition: New Genuine OEM Part
Function
This collar nut is designed to:
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Secure gear head and drive tube components in place
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Maintain proper alignment of cutting attachment assemblies
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Prevent loosening under vibration and operating load
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Replace worn, stripped, or missing collar nuts
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Restore safe and reliable edger performance
A damaged or missing collar nut may cause loose gear head components or unsafe operation.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
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OEM part number 4133 642 7601
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Part location: drive tube assembly / gear head
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Compatible STIHL model listed below
Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits select STIHL edgers and Kombi attachments, including:
Edgers
FC 55
FC 55-D
FC 56 C-E
FC 70
FC 70 C-E
FC 73
FC 75
FC 90
FC 91
FC 100
Kombi Attachments
FCB-KM 4137
FCB-KM 4180
Battery Units
FCA 80.0
FCA 135
This list includes common applications always confirm using your parts diagram or owners manual.
Installation / Usage
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Turn off engine or remove battery before servicing
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Access the drive tube or gear head assembly
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Remove the worn or stripped collar nut
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Install the new STIHL OEM collar nut 4133 642 7601
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Tighten securely to factory specifications
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Test gear head stability before operation
Professional installation is recommended if unsure.
Maintenance Tips
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Inspect fasteners regularly for loosening or wear
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Replace stripped nuts immediately to prevent gear head damage
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Keep gear head components clean and properly lubricated
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Use only genuine STIHL OEM hardware for best fit and safety
