STIHL Rim Sprocket Kit 3/8" 7T for 034, 036, MS340 and MS360 Chainsaws - 1125 007 1041

The STIHL Rim Sprocket Kit 3/8" 7T (part number 1125 007 1041) is a genuine OEM clutch drum assembly for the STIHL 034, 036, MS 340, MS 360 and MS 360 ARCTIC chainsaws. The kit includes the clutch drum, 3/8" 7-tooth rim sprocket and needle bearing as a complete replacement assembly — providing everything needed to restore correct chain drive, smooth chain engagement and reliable cutting performance in a single purchase. The 3/8" pitch and 7-tooth configuration match the original factory specification for these models, maintaining correct chain speed, bar compatibility and drive geometry. This part supersedes the earlier STIHL reference 1125 640 2006. Available from Gustharts, an authorised STIHL dealer with UK stock ready to ship.

This is a complete clutch drum kit, not a rim sprocket only. It includes the drum body, 3/8" 7T rim and needle bearing. If you require the replaceable rim sprocket alone (without the drum), check the STIHL parts diagram for your specific model before ordering. Always confirm your machine's model and serial number against the Fits Models list and contact Gustharts if you need compatibility confirmation before purchasing.

Key Features

• Genuine STIHL OEM rim sprocket kit — manufactured to original specification for correct fit, chain engagement geometry and drive performance
• Part number 1125 007 1041 — also referenced as 11250071041; supersedes earlier part 1125 640 2006
• Complete kit — includes clutch drum, 3/8" 7-tooth rim sprocket and needle bearing as a single assembly
• 3/8" pitch, 7-tooth configuration — matches the original factory specification for chain speed and drive geometry on compatible models
• Rim sprocket design — the replaceable rim sits on the drum body, allowing worn teeth to be replaced without changing the entire assembly
• Restores smooth chain engagement — hooked, worn or damaged sprocket teeth cause rough chain movement, uneven cutting and accelerated bar and chain wear
• Reduces chain and bar wear — a correctly profiled sprocket maintains consistent contact geometry between drive links and teeth
• Direct fit for 034, 036, MS 340, MS 360 and MS 360 ARCTIC — aligns with original clutch drum mounting without modification

What's in the Kit

The STIHL 1125 007 1041 rim sprocket kit is a complete assembly comprising three components:

• Clutch drum — the body on which the rim sprocket sits; transfers drive from the clutch to the sprocket and bar
• 3/8" 7-tooth rim sprocket — the star-shaped, replaceable drive element that engages the chain drive links; 3/8" pitch with 7 teeth matches the chain pitch of the original STIHL bar and chain specification for these models
• Needle bearing — supports the drum on the clutch shaft, reducing friction and wear at the drive interface

Technical Specification

Fits Models

• STIHL 034
• STIHL 036
• STIHL MS 340
• STIHL MS 360
• STIHL MS 360 ARCTIC

Always confirm your machine's exact model designation and serial number before ordering. Contact Gustharts if you need compatibility confirmation for your specific variant.

Why Replace with a Genuine STIHL Sprocket Kit?

The sprocket is one of the highest-wear components in a chainsaw drivetrain. Every cut involves the drive links of the chain engaging and disengaging with the sprocket teeth at high speed — over thousands of cuts, this wears the tooth profile progressively, changing the contact geometry between chain and sprocket. Hooked or worn teeth increase chain skip, cause uneven cutting forces and accelerate wear on the chain's drive links and bar rail simultaneously. On a professional saw like the MS 360, which is regularly used in demanding forestry and timber processing work, ignoring the sprocket interval directly increases running costs across chains and bars.

STIHL's genuine rim sprocket kit uses a heat-treated steel rim manufactured to exact tooth profile tolerances matched to the 3/8" chain pitch used on these models. Aftermarket sprockets vary significantly in tooth geometry, steel hardness and dimensional accuracy — differences that aren't visible on inspection but affect chain life over the full service interval. The OEM needle bearing included in this kit is also matched to the original drum shaft dimensions, ensuring correct running clearance without the tight-spot resistance that an undersized aftermarket bearing can produce during the first hours of use.

Also Known As

The STIHL rim sprocket kit is also referred to as a clutch drum and sprocket kit, chain sprocket kit, chainsaw sprocket assembly, sprocket drum kit, drive sprocket kit and clutch drum assembly. The distinguishing terminology for this specific part type is rim sprocket — the rim is the separate, replaceable star-shaped element that sits on the drum body, as distinct from a spur sprocket, which is a one-piece design. For correct ordering always use STIHL part number 1125 007 1041, or the superseded reference 1125 640 2006.

Often Replaced Alongside

The sprocket should be replaced at the same time as the chain and bar — or at every second chain replacement as a minimum — to maintain matched wear rates across the drive system:

• STIHL 3/8" chainsaw chain — always replace the chain when fitting a new sprocket to avoid uneven wear between old chain and new teeth
• Chainsaw bar for MS 360 / 034 / 036 — inspect the bar rail and sprocket nose for wear at the same service point
• Clutch assembly for MS 360 / 034 / 036 — inspect clutch pads and springs when the drum is removed; replace if worn

Explore More

• STIHL Spare Parts
• STIHL Parts Finder
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FAQs

What does the STIHL rim sprocket kit 1125 007 1041 include?

The kit includes three components: the clutch drum, a 3/8" 7-tooth rim sprocket and a needle bearing — everything needed to replace the complete drive assembly on compatible models.

What is the difference between a rim sprocket and a spur sprocket?

A rim sprocket is a two-part design where a replaceable star-shaped rim sits on a separate drum body. This allows the rim to be replaced independently when worn without changing the drum. A spur sprocket is a one-piece integrated design. STIHL's 034, 036 and MS 360 use a rim sprocket system.

Which models does part 1125 007 1041 fit?

Confirmed compatible models are the STIHL 034, 036, MS 340, MS 360 and MS 360 ARCTIC. Always confirm your exact model and serial number before ordering.

What chain pitch does this sprocket kit work with?

3/8" pitch — this matches the chain and bar specification for compatible STIHL 034, 036 and MS 360 series models. Always confirm your bar and chain pitch before ordering a replacement sprocket.

How often should the sprocket be replaced?

STIHL recommends replacing the sprocket at every second chain change as a minimum. Regular inspection is also recommended — replace immediately if teeth are hooked, visibly worn or chain engagement is rough or uneven.

Does this kit supersede part number 1125 640 2006?

Yes. Part 1125 007 1041 is the current STIHL part number and supersedes the earlier reference 1125 640 2006. Both numbers refer to the same component for ordering purposes.

Should I replace the chain at the same time as the sprocket?

Yes. Always fit a new chain when replacing the sprocket. Running a worn chain on new sprocket teeth — or vice versa — causes accelerated wear on both components as the pitch profiles no longer match.

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