Revitalize Your Chainsaw with Our Premium 20" Replacement Chain for Stihl 33RS-72 – Limited Time Discount Available!

A straightforward 20” replacement for select Stihl saws

This 20” replacement chain is built for setups that use the Stihl 33RS-72 specification. It is specifically listed for Stihl MSE 250, MS 311, and MS 391 saws when they are equipped with the correct 20” guide bar setup.

It’s also cross-referenced to Husqvarna 585550072, H46-72, H47-72, and 72EXL072G, which is helpful if you’re matching an existing chain by part number rather than by saw model alone.

Will this chain fit your saw?

The easiest way to confirm fitment is to match all four chain specs on your current setup, not just the saw model:

• Bar length: 20”
• Pitch: 3/8”
• Gauge: .050”
• Drive links: 72

If your saw uses a 20” guide bar and your current chain is marked or measured as 3/8”, .050” gauge, with 72 drive links, this chain is the correct fit.

Compatible Stihl models listed for this chain:

• Stihl MSE 250
• Stihl MS 311
• Stihl MS 391

Compatible reference part numbers listed for this chain:

• Stihl 33RS-72
• Husqvarna 585550072
• H46-72
• H47-72
• 72EXL072G

A quick note on fitment: the same saw model can sometimes be run with different bar lengths or bar setups. That means a Stihl MS 311 or MS 391 does not automatically use this chain unless the bar is specifically a 20” bar with 3/8” pitch, .050” gauge, and 72 drive links. Before ordering, check the markings stamped on the guide bar or compare against the numbers on your existing chain packaging.

If one of those four measurements is different, this chain will not fit correctly even if the saw model is on the compatibility list.

Replacing the chain

Replacing a chainsaw chain is simple, but safety comes first.

1. Turn the saw off, disconnect power or make sure the engine cannot start, and wear gloves before handling the chain.
2. Remove the side cover and release chain tension so the old chain can be lifted off the bar and drive sprocket.
3. Clean the bar groove, oil hole, and clutch-cover area before installing the new chain.
4. Fit the new chain around the drive sprocket and onto the guide bar, making sure the cutter direction is correct along the top of the bar.
5. Reinstall the side cover and adjust chain tension until the chain sits snugly on the bar but still pulls around by hand.
6. After a short test run, stop the saw and recheck tension, since a new chain can loosen slightly during initial use.

A properly tensioned chain should not hang under the bar, but it also should not be tightened so much that it binds.

Keeping it sharp

A sharp chain cuts faster, safer, and with less strain on the saw.

• Keep the chain out of dirt: Even a sharp new chain dulls quickly if it contacts soil, rocks, or dirty bark.
• Maintain proper chain tension: A loose chain can wear unevenly, while an overtightened chain increases heat and bar wear.
• Make sure chain oil is flowing: Good lubrication helps preserve the cutters, tie straps, and bar rails during heavy cutting.

If cutting performance drops and the saw starts producing fine dust instead of chips, it’s time to inspect and sharpen the chain.

FAQ

Will this fit every Stihl MS 311 or MS 391?
No. It fits those models only when they are using a 20” guide bar with 3/8” pitch, .050” gauge, and 72 drive links.

Can I use this if my old chain matches Husqvarna H46-72 or 72EXL072G?
Yes, this chain is listed as compatible with Husqvarna 585550072, H46-72, H47-72, and 72EXL072G, provided your bar setup is also 20”, 3/8”, .050”, and 72 drive links.