18-Inch Chainsaw Chain Replacement for Stihl 26RS-68

If you need an 18-inch replacement chain for a Stihl saw that uses the 26RS-68 specification, this chain is intended for a range of popular models including the Stihl 025, MS230, MS 231, MS 241, MS 250, MS 251, and MS 261. It is designed as a replacement for Stihl OEM references 26RS68 / 26RS-68 and 36390050068 / 3639 005 0068.

Will this chain fit your saw?

The easiest way to confirm fitment is to match your current chain or your guide bar specs in four areas:

• bar length: 18 inches
• pitch: match the pitch marked on your current bar or chain
• gauge: match the gauge listed for your bar
• drive-link count: 68 drive links

For this product page, the key fitment identifier is the Stihl 26RS68 / 26RS-68 chain specification, along with OEM replacement numbers 36390050068 / 3639 005 0068. If your current chain matches those references, this is the correct replacement.

This chain is listed as compatible with these Stihl models:

• Stihl 025
• Stihl MS230
• Stihl MS 231
• Stihl MS 241
• Stihl MS 250
• Stihl MS 251
• Stihl MS 261

That said, saw model alone is not always enough to guarantee fit. Some saws can be run with different bar setups, and chain fit depends on the bar actually installed on the saw. For example, an MS 250 or MS 261 may accept more than one bar and chain combination depending on how it was set up. Before ordering, check the numbers stamped on the guide bar or compare the markings on your existing chain packaging if available.

If your current chain is labeled Stihl 26RS-68, or the OEM number 3639 005 0068, you can order with confidence.

Replacing the chain

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

1. Shut the saw off completely, disconnect the spark plug, and engage the chain brake before handling the bar area.
2. Remove the side cover and loosen the bar so the old chain can be lifted off the sprocket and guide bar.
3. Clean debris from the bar groove, oil hole, and clutch cover area before installing the new chain.
4. Fit the new chain around the drive sprocket and along the guide bar, making sure the cutter direction is facing the correct way on the top of the bar.
5. Reinstall the side cover, then adjust chain tension so the chain sits snugly on the bar but can still be pulled around by hand with gloves.
6. Release the chain brake if needed, rotate the chain by hand to confirm smooth movement, then recheck tension after the first few cuts.

A new chain will often stretch slightly during initial use, so it is normal to need a quick tension adjustment soon after installation.

Keeping it sharp

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

• Touch up the cutters regularly instead of waiting until the chain becomes very dull.
• Keep the chain properly tensioned, because a loose chain can wear faster and cut poorly.
• Avoid contact with dirt, rocks, or metal, which can dull a sharp chain almost immediately.

Also make sure your bar oil reservoir stays filled. Good lubrication helps reduce heat and wear on both the chain and the guide bar.

FAQ

Will this fit every 18-inch Stihl bar?

No. An 18-inch bar length alone is not enough to confirm fit. You also need the correct pitch, gauge, and 68-drive-link configuration, or a match to Stihl 26RS68 / 26RS-68 or 36390050068 / 3639 005 0068.

My saw model is listed, so am I good to go?

Usually, but you should still verify the bar and chain specs. Compatible models include the Stihl 025, MS230, MS 231, MS 241, MS 250, MS 251, and MS 261, but those saws may use different bar setups depending on the individual machine.