Description
Overview:
The Control Bolt is a genuine Stihl replacement part for SG 21 and SG 31 manual sprayers. Manufactured in robust steel to OEM specification, it secures key assemblies within the sprayer so components stay aligned and sealed during use. This helps maintain reliable pressure, prevents loosening under vibration, and supports consistent spray performance. Supplied to Stihl's original design, it is identified by OEM No. 4255 500 2900 and MPN 42555002900. Use it when a bolt is missing, worn, or corroded, or as part of routine servicing to keep your sprayer operating safely. Being a Genuine Stihl part, it fits correctly without modification and preserves the integrity of the equipment.
Key Features:
- Genuine Stihl OEM part for assured compatibility and performance (OEM 4255 500 2900 / MPN 42555002900)
- Steel construction for strength and long service life in outdoor conditions
- Correct thread and length for a direct fit on SG 21 and SG 31 sprayers
- Maintains proper clamping force to reduce leaks and misalignment
- Helps restore reliable pressure and consistent spray pattern after servicing
- Straightforward to install with standard hand tools
- Ideal as a like-for-like replacement for damaged or missing hardware
- Supports safe operation by keeping assemblies securely fixed under vibration
Typical Applications:
Used during sprayer maintenance or repair to refit and secure assemblies such as housings or brackets on Stihl SG-series units. Suitable for replacing a lost, stripped, or corroded bolt to maintain sealing, alignment, and dependable performance in garden care, landscaping, grounds maintenance, and agricultural spot-spraying tasks.
Also known as:
Retaining bolt, clamping bolt, control fixing, securing bolt, sprayer retaining hardware, OEM securing bolt for Stihl sprayers.
Fits Models:
SG 21, SG 31, SG21, SG31
Alternate Part Numbers:
4255-500-2900, 42555002900
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