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Description
4126 642 7600 STIHL Collar Nut M10x1 L/H Thread – Genuine OEM Part
The STIHL Collar Nut M10x1 Left-Hand Thread (4126 642 7600) is a genuine OEM fastening component designed for use in the gear head assemblies of a wide range of STIHL trimmers, brushcutters, clearing saws, and Kombi attachments. This collar nut is commonly used to secure cutting attachments such as mowing heads and blades onto the gearbox output shaft.
Manufactured to STIHL’s exact specifications, this OEM left-hand thread collar nut ensures proper fitment, secure fastening, and long-lasting durability when replacing worn, stripped, or missing hardware.
Product Details
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OEM Part Number: 4126 642 7600
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Brand: STIHL (OEM)
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Part Type: Collar Nut
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Thread Size: M10 x 1
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Thread Direction: Left-Hand (L/H) Thread
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Application: Gear Head / Cutting Attachment Mounting
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Condition: New Genuine OEM Part
Function
This collar nut is designed to:
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Secure mowing heads and cutting blades to the gear head shaft
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Provide reliable fastening during high-speed operation
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Prevent loosening through left-hand thread design
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Replace stripped, worn, or missing collar nuts
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Maintain safe and proper cutting attachment performance
⚠️ Using the wrong thread direction may cause attachment loosening or damage during operation.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
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OEM part number 4126 642 7600
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Thread type: M10x1 Left-Hand Thread
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Part location: gear head / cutting attachment mounting shaft
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Compatible STIHL model listed below
⚠️ Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits a wide range of STIHL equipment, including:
Brushcutters & Trimmers (Gear Head Applications)
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FS 44, FS 55, FS 56, FS 66, FS 70, FS 72 R
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FS 74, FS 76, FS 80, FS 81, FS 83, FS 85, FS 86
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FS 90, FS 91, FS 94 R
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FS 106, FS 108, FS 110, FS 111
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FS 120, FS 130, FS 131
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FS 200 R, FS 235, FS 240, FS 250, FS 251
Clearing & Backpack Units
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FR 108, FR 235.0
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FR 410 C-E, FR 410.0 C-E
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FR 460 TC-EFM, FR 460.0 TC-EFM
Kombi & Attachments
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FS-KM 4140, FS-KM 4180
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FSS-KM
Battery Units
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FSA 80.0, FSA 80.0 R
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FSA 90 R
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FSA 120.0, FSA 120.0 R
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FSA 200.0, FSA 200.0 R
Mowing Heads
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FixCut 30-2
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FixCut 31-2
⚠️ This list includes common applications — always confirm using your parts diagram or owner’s manual.
Installation / Usage
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Turn off engine or remove battery before servicing
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Lock the gearbox shaft using the proper STIHL locking tool
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Remove the old collar nut (left-hand thread loosens clockwise)
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Install the new STIHL OEM collar nut securely
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Tighten to manufacturer torque specification
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Confirm cutting attachment is properly secured before use
Maintenance Tips
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Always check cutting head hardware for tightness before operation
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Replace damaged or stripped nuts immediately
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Keep gear head threads clean and free of debris
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Use correct left-hand thread hardware only
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Use only genuine STIHL replacement parts for best fit and reliability
