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Description
4140 790 7501 STIHL Tommy Screw – Genuine OEM Part
The STIHL Tommy Screw (4140 790 7501) is a genuine OEM hand-tightening screw (thumb screw) used in the drive tube assembly / loop handle system on select STIHL KombiSystem units and compatible models.
This tommy screw is designed to secure components without requiring special tools, helping maintain correct fitment and safe operation. Replacing a stripped, missing, or damaged tommy screw restores secure clamping and proper drive tube assembly function.
Manufactured to STIHL factory specifications, this OEM tommy screw ensures correct thread fit, secure holding strength, and long-lasting durability.
Product Details
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OEM Part Number: 4140 790 7501
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Brand: STIHL (Genuine OEM)
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Part Type: Tommy Screw / Thumb Screw
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Application: Drive Tube Assembly / Loop Handle / Extensions (varies by model)
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Condition: New Genuine OEM Part
Function
This OEM tommy screw is designed to:
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Secure drive tube assembly and related components
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Provide tool-free tightening for clamping connections
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Replace stripped, worn, or missing tommy screws
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Maintain proper alignment and secure operation
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Support safe attachment and extension use
⚠️ A missing or loose tommy screw may cause poor clamping, vibration, or unsafe attachment operation.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4140 790 7501
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Your STIHL model is listed below
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Part location matches your drive tube assembly diagram
⚠️ Always verify fitment by OEM part number for best accuracy.
Compatibility (Fits STIHL Models)
KombiSystem / KombiMotors
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KM 55 R
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KM 55 R-D
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KM 55 RC-E
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KM 55 RC-E D
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KM 56 RC-E
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KM 85 R
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KM 91 R
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KM 110 R
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KM 111 R
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KM 131 R
Cordless KombiMotors
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KMA 80.0 R
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KMA 120.0 R
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KMA 120.0 R SET
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KMA 130 R
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KMA 135 R
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KMA 200.0 R
Drive Tube Extensions (HT-KM / HL-KM)
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KM 90 R (Drive tube extension 1 m HT-KM)
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KM 94 R (Carbon drive tube extension 1 m HT-KM / HL-KM)
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KM 130 R (Carbon drive tube extension 1 m HT-KM / HL-KM)
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KM 85 R (Carbon drive tube extension 1 m HT-KM / HL-KM)
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KM 110 R (Carbon drive tube extension 1 m HT-KM / HL-KM)
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KM 111 R (Carbon drive tube extension 1 m HT-KM / HL-KM)
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KM 131 R (Carbon drive tube extension 1 m HT-KM / HL-KM)
Other
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FS 83 T (Drive tube assembly FS 83 T)
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FS-MM (Drive tube assembly)
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BT 45 (Planting hole drill accessory)
Installation Notes
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Turn off engine and allow it to cool
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Locate the tommy screw on the drive tube clamp / connection point
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Remove the worn or stripped screw
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Install STIHL OEM tommy screw 4140 790 7501
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Tighten securely by hand as designed
⚠️ Do not overtighten. Use STIHL torque guidance if specified for your model.
Maintenance Tips
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Inspect clamping screws regularly for looseness or wear
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Keep threads clean to prevent binding
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Replace damaged screws immediately to maintain safe operation
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Use only genuine STIHL OEM fasteners for correct fit and holding strength
