Description
Overview:
This Chain Sprocket 0.325'' 7T is a genuine Stihl OEM drive component designed for mid-size petrol chainsaws, including the 029 and 039. Made from hardened steel for strength and wear resistance, it transfers engine power to the chain with a 0.325 inch (8.25 mm) pitch and seven-tooth profile for consistent engagement. Supplied under Manufacturer Part Number 1125 640 2005, it is a direct replacement that helps restore cutting efficiency and smooth running. Fitted correctly, it supports accurate chain tracking, reduces slip, and helps protect the bar and chain from premature wear. Ideal for routine maintenance or when the original sprocket shows hooked or worn teeth, it keeps your saw working reliably across everyday cutting tasks.
Key Features:
- Genuine Stihl part (OEM) for assured fit and performance (MPN 1125 640 2005)
- 0.325 inch (8.25 mm) pitch with 7 teeth for precise chain drive
- Hardened steel construction for durability under heavy use
- Accurate machining for smooth power transfer and reduced vibration
- Helps maintain correct chain speed and extends bar and chain service life
- Direct replacement on listed Stihl models, with straightforward fitting during routine servicing
- Suitable for standard 0.325 pitch chains used on compatible saws
- Reliable choice for both professional and DIY users
Typical Applications:
Used to replace a worn or damaged drive sprocket to restore smooth chain movement and cutting performance. Common in firewood processing, landscaping, storm clearance, felling and snedding, and general site work. Replace when teeth are hooked or after heavy use to maintain safe, efficient operation.
Also known as:
Drive sprocket, spur sprocket, clutch sprocket, output sprocket, chain drive wheel, chain drive gear.
Fits Models:
029, 030, 031, 034, 039, MS290, MS310, MS340, MS390
Alternate Part Numbers:
1125-640-2005, 11256402005
Product Specifications
| L&S Part No. | 1125 640 2005 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11256402005 |
| Unit of Sale | 1 |
| Applications | 029, 030, 031, 034, 039, MS290, MS310, MS340, MS390 |
| Fits Brands | Stihl |
| Fits Models | MS290, MS310, MS390 | 030, 031 | 029, 039 | MS340 | 034 |
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