The Husqvarna 550 XP Mark II takes the Husqvarna X-CUT SP33G chain loop 581 64 31-66 (66 drive links, 40 cm bar) as its chain; Australian sellers list it from A$49.00 as of 30 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your chainsaw
Husqvarna 550 XP Mark II
Chainsaw
Confirmed against Husqvarna's listConfirmed against Husqvarna's own compatibility list
Not yours? Change
Takes the 581 64 31-66 chain
X-CUT SP33G chain loop 581 64 31-66 (66 drive links, 40 cm bar) · check the code on your old part before ordering.
Husqvarna Australia lists the 550 XP Mark II with a 40 cm (16 in) bar: 581 64 31-66, 66 drive links. Other bar lengths take other loops.
Your chainsaw
Chainsaw
Confirmed against Husqvarna's listConfirmed against Husqvarna's own compatibility list
Takes the 581 64 31-66
Chain · check the code on your old part.
Husqvarna Australia lists the 550 XP Mark II with a 40 cm (16 in) bar: 581 64 31-66, 66 drive links. Other bar lengths take other loops.
Other Husqvarna chainsaws that take the 581 64 31-66
GenuineGenuine Husqvarna
$49.00
Husqvarna Australia · 30 OctLowest genuine · Husqvarna Australia · checked 30 Oct
CompatibleCompatible option
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No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Husqvarna. Compatible: another brand.Genuine is made by Husqvarna. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $49.00
Husqvarna 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.
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AUD, before delivery. Each price shows when it was checked.
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How long it lasts
Replace it when the cutting teeth are worn down to 4 mm (5/32 in), Husqvarna says; sharpen them when the chain cuts poorly.
After replacing: No reset needed. Check the chain tension often until a new chain has run in, Husqvarna says.
How to change the chain in your Husqvarna 550 XP Mark II
Watch the guide or follow the steps.
- 1Stop the saw (on a battery saw, take the battery out) and put on protective gloves.
- 2Remove the bar nuts and the clutch cover, and slacken the chain tensioning screw.
- 3Take off the old chain. Lift the new chain over the drive sprocket and into the bar groove, starting at the top edge of the bar, with the cutter edges facing forward on the top of the bar.
- 4Refit the clutch cover with the chain adjuster pin in the hole in the bar, and tighten the bar nuts finger-tight.
- 5Turn the tensioning screw clockwise until the chain does not hang below the bar but still turns easily by hand.
- 6Hold up the nose of the bar and tighten the bar nuts with the combination wrench. Check the tension often until the new chain has run in.
Every number this part goes by
- Retail name:
- 581 64 31-66
- Retail name:
- 581-64-31-66
- Retail name:
- 581643166
- Retail name:
- SP33G 66
Sellers list any of these; they are the same part.
About your Husqvarna 550 XP Mark II
Husqvarna chainsaw — Professional chainsaws. Its chain is the X-CUT SP33G chain loop 581 64 31-66 (66 drive links, 40 cm bar), part 581 64 31-66.
Other chains the maker lists for this chainsaw:
- Husqvarna X-CUT SP33G chain loop 581 64 31-56 (56 drive links, 33 cm bar). With a 33 cm (13 in) bar: 56 drive links.
- Husqvarna X-CUT SP33G chain loop 581 64 31-64 (64 drive links, 38 cm bar). With a 38 cm (15 in) bar: 64 drive links.
- Husqvarna X-CUT SP33G chain loop 581 64 31-72 (72 drive links, 45 cm bar). With a 45 cm (18 in) bar: 72 drive links.
- Husqvarna X-CUT SP33G chain loop 581 64 31-80 (80 drive links, 50 cm bar). With a 50 cm (20 in) bar: 80 drive links.
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 7 Husqvarna models
Husqvarna7 models
435. Husqvarna lists the 435 with a 40 cm bar and SP33G chain: 66 drive links.
435 e-series. Husqvarna Australia lists the 435 e-series with a 40 cm (16 in) bar: 581 64 31-66, 66 drive links. Other bar lengths take other loops.
440. Husqvarna lists the 440 with a 40 cm bar and H30 chain (.325", 1.3 mm); its current loop for that bar is X-CUT SP33G, 66 drive links, for 40 cm.
550 XP Mark II. Husqvarna Australia lists the 550 XP Mark II with a 40 cm (16 in) bar: 581 64 31-66, 66 drive links. Other bar lengths take other loops.
550 XP. With a 1.3 mm 40 cm (16 in) bar: X-CUT SP33G, 66 drive links.
The other 2 models. With a 40 cm (16 in) bar: 66 drive links.
Common questions
- Which chain fits the Husqvarna 550 XP Mark II?
- The Husqvarna 550 XP Mark II takes the Husqvarna X-CUT SP33G chain loop 581 64 31-66 (66 drive links, 40 cm bar). Husqvarna Australia lists the 550 XP Mark II with a 40 cm (16 in) bar: 581 64 31-66, 66 drive links. Other bar lengths take other loops.
- Where can I buy the 581 64 31-66 in Australia?
- We track 1 Australian seller for the 581 64 31-66; the lowest listed price when we last checked was A$49.00 at Husqvarna Australia. Prices are re-checked daily and dated on this page.
- How do I fit the 581 64 31-66 in a Husqvarna 550 XP Mark II?
- 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 until a new chain has run in, Husqvarna says.
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