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Description
4243 640 4506 Lock | Genuine STIHL OEM Replacement
The 4243 640 4506 Lock is a genuine STIHL OEM replacement component used in the adjustable-angle gearbox assembly of compatible STIHL long-reach hedge trimmers and Kombi attachments. STIHL parts documentation identifies this component as a locking device within the angle-drive assembly.
The lock helps secure the adjustable angle-drive mechanism in its selected position, supporting proper operation of the hedge-trimmer attachment during use.
Features That Make a Difference
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Genuine STIHL OEM replacement part
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Part Number: 4243 640 4506
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Product Type: Lock / Locking Device
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Designed for the adjustable-angle drive assembly.
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Helps secure the angle-drive mechanism in position.
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Suitable for STIHL long-reach hedge trimmers and related attachments.
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OEM design provides proper fit and reliable operation.
Benefits
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Helps restore proper angle-drive locking function.
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Replaces a worn, damaged, or missing locking component.
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Helps keep the selected cutting-head angle securely positioned.
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Supports safe and consistent operation.
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Genuine STIHL construction helps ensure proper fit.
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Ideal for repair and maintenance of compatible hedge-trimmer attachments.
Specifications
| Specification | Details |
|---|---|
| Part Number | 4243 640 4506 |
| Alternate Part Number | 42436404506 |
| Product Type | Lock / Locking Device |
| Brand | STIHL |
| System | Adjustable Angle Drive |
| Angle Drive | Up to 145° on applicable models |
| Application | Long-Reach Hedge Trimmers / Kombi Attachments |
| Use | Repair / Replacement |
| Part Type | Genuine OEM Replacement |
STIHL parts diagrams place 4243 640 4506 inside the angle-drive assembly for the HLA 135, specifically the 145° adjustable, 600 mm configuration.
Compatibility
The 4243 640 4506 Lock is used across several STIHL long-reach hedge-trimmer and Kombi-tool applications, including:
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HLA 135
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HLA 135 K
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HLA 140.0
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HLA 140.0 K
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HLA 150.0
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HL 94
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HL 94 K
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HL 91 K
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HL 145°
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HL-KM 145°
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FH 145°
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FH-KM 145°
Parts references also list it for HL 92 C-E / HL 92 KC-E applications.
For the HLA 135, STIHL's parts diagram shows the lock as component #17 in the adjustable-angle gearbox assembly.
Always verify your exact STIHL model, serial number, attachment configuration, and original part number before ordering to ensure compatibility.
Why Replace the Lock?
The locking mechanism is important for maintaining the selected angle of an adjustable hedge-trimmer head. A worn or damaged lock may prevent the attachment from staying securely in the desired position.
Replacing the lock with the correct OEM component helps restore the intended adjustment and locking function.
Why Buy from Barry’s Power Equipment?
Barry’s Power Equipment provides quality OEM and replacement parts for lawn and garden equipment.
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Genuine OEM replacement parts
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Quality products for residential and commercial equipment
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Competitive Pricing
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Fast Shipping
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Expert Customer Support
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Reliable parts for equipment repair and maintenance
Restore the proper angle-locking function of your compatible STIHL hedge-trimmer attachment with the STIHL 4243 640 4506 Lock, a genuine OEM replacement designed for dependable service.



