The STIHL MS 661 C-M takes the STIHL 36 RS saw chain 3621 000 0084 (84 drive links, 63 cm bar) as its chain; Australian sellers list it from A$61.00 as of 28 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your chainsaw
STIHL MS 661 C-M
Chainsaw
Confirmed against STIHL's listConfirmed against STIHL's own compatibility list
Not yours? Change
Takes the 3621 000 0084 chain
36 RS saw chain 3621 000 0084 (84 drive links, 63 cm bar) · check the code on your old part before ordering.
STIHL Australia sells the MS 661 C-M with a 63 cm 3/8" bar: 84 drive links. STIHL lists 72 for 50 cm, 91 for 71 cm and 105 for 80 cm.
Your chainsaw
Chainsaw
Confirmed against STIHL's listConfirmed against STIHL's own compatibility list
Takes the 3621 000 0084
Chain · check the code on your old part.
STIHL Australia sells the MS 661 C-M with a 63 cm 3/8" bar: 84 drive links. STIHL lists 72 for 50 cm, 91 for 71 cm and 105 for 80 cm.
Other STIHL chainsaws that take the 3621 000 0084
GenuineGenuine STIHL
$61.00
STIHL Australia · 28 OctLowest genuine · STIHL Australia · checked 28 Oct
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by STIHL. Compatible: another brand.Genuine is made by STIHL. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $61.00
STIHL Australia. Every seller we track is listed below. Some links earn us a commission. Some seller links earn us a commission, at no extra cost to you.
Other parts this chainsaw takes
- STIHL Service Kit 16 for MS 661 C-M (1144 007 4101)Open STIHL Australia$45.00
The service kit. STIHL lists Service Kit 16 (air filter, spark plug and fuel filter in one box) for the MS 661 C-M. Separate from the chain. Reduces dust and debris drawn into the engine with the intake air (air filter).
Compare 2 sellers - NGK BPMR7A spark plugOpen Power Mowers$5.60
The spark plug. STIHL approves NGK BPMR7A (from STIHL) or Bosch WSR 6 F; gap 0.5 mm, replace after every 100 hours of runtime. Separate from the chain.
Compare 3 sellers - Bosch WSR6F spark plugOpen Amazon AU$4.00
The spark plug. STIHL's other approved plug for this model (with NGK BPMR 7 A); gap 0.5 mm. Separate from the chain.
Compare 3 sellers
Compare 1 seller
AUD, before delivery. Each price shows when it was checked.
Opens STIHL Australia in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it once any cutter's service marks are no longer visible, STIHL says; check the chain before work and sharpen it when it is blunt.
After replacing: No reset needed. Check the chain tension often while a new chain beds in.
How to change the chain in your STIHL MS 661 C-M
Watch the guide or follow the steps.
- 1Stop the engine and engage the chain brake. On a battery saw, take the battery out; on an electric saw, unplug it. Put on sturdy work gloves: the cutters are sharp.
- 2Undo the nut and take off the chain sprocket cover. On models with the quick chain tensioner (C-B, C-BE), open the wing-nut handle and undo the wing nut instead.
- 3Slacken the chain (turn the tensioning screw anticlockwise, or the tensioning gear clockwise on quick-tensioner models), then lift off the guide bar and the old chain.
- 4Fit the new chain in the bar groove so the arrows on the tie straps on top of the bar point in the direction of rotation, and seat the drive links on the chain sprocket.
- 5Put the bar back on with the tensioner peg in the hole in the bar, then turn the tensioning screw clockwise (the tensioning gear anticlockwise on quick-tensioner models) until the chain fits snugly against the bar and the drive links sit in the groove.
- 6Refit the chain sprocket cover flush with the saw and tighten the nut firmly (close the wing-nut handle on quick-tensioner models). STIHL says the chain expands and contracts as you cut, so check the tension regularly.
Every number this part goes by
- Retail name:
- 36 RS 84
- Retail name:
- 3621 000 0084
- Retail name:
- 3621-000-0084
- Retail name:
- 36210000084
- Retail name:
- 36RS 84
Sellers list any of these; they are the same part.
About your STIHL MS 661 C-M
STIHL chainsaw — Professional chainsaws. Its chain is the 36 RS saw chain 3621 000 0084 (84 drive links, 63 cm bar), part 3621 000 0084.
Other chains the maker lists for this chainsaw:
- STIHL 36 RS saw chain 3621 000 0072 (72 drive links, 50 cm bar). With a 50 cm (20") bar: 72 drive links.
- STIHL 36 RS saw chain 3621 000 0091 (91 drive links, 71 cm bar). With a 71 cm (28") bar: 91 drive links.
- STIHL 36 RS saw chain 3621 000 0105 (105 drive links, 80 cm bar). With a 80 cm (32") bar: 105 drive links.
Also in this chainsaw:
- STIHL Service Kit 16 for MS 661 C-M (1144 007 4101). STIHL lists Service Kit 16 (air filter, spark plug and fuel filter in one box) for the MS 661 C-M.
- NGK BPMR7A spark plug. STIHL approves NGK BPMR7A (from STIHL) or Bosch WSR 6 F; gap 0.5 mm, replace after every 100 hours of runtime.
- Bosch WSR6F spark plug. STIHL's other approved plug for this model (with NGK BPMR 7 A); gap 0.5 mm.
Where the model number is: The model is on the rating plate on the saw's housing (STIHL MS 170, Husqvarna 135 Mark II, Ryobi OCS1830BL). The chain's code is stamped on the drive links or printed on its box, and the bar length is on the bar.
Fits these 4 STIHL models
STIHL4 models
MS 661 C-M. STIHL Australia sells the MS 661 C-M with a 63 cm 3/8" bar: 84 drive links. STIHL lists 72 for 50 cm, 91 for 71 cm and 105 for 80 cm.
The other 3 models. With a 63 cm (25") bar: 84 drive links.
Common questions
- Which chain fits the STIHL MS 661 C-M?
- The STIHL MS 661 C-M takes the STIHL 36 RS saw chain 3621 000 0084 (84 drive links, 63 cm bar). STIHL Australia sells the MS 661 C-M with a 63 cm 3/8" bar: 84 drive links. STIHL lists 72 for 50 cm, 91 for 71 cm and 105 for 80 cm.
- Where can I buy the 3621 000 0084 in Australia?
- We track 1 Australian seller for the 3621 000 0084; the lowest listed price when we last checked was A$61.00 at STIHL Australia. Prices are re-checked daily and dated on this page.
- How do I fit the 3621 000 0084 in a STIHL MS 661 C-M?
- 6 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A blunt or stretched chain cuts slowly, throws dust instead of chips, and makes the saw harder to control.
- Is there anything to reset afterwards?
- No reset needed. Check the chain tension often while a new chain beds in.
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