Overview
This aftermarket 18-inch replacement chain is designed to fit select Stihl chainsaw models. It serves as a drop-in replacement when the original chain becomes dull past the point of resharpening, develops a damaged cutter, or has stretched beyond the tensioner’s adjustment range. Having a spare on the shelf eliminates trips to the dealer mid-project.
Key specifications
- Bar length: 18”
- Type: Semi-chisel (aftermarket replacement)
Compatibility
Engineered to match the specifications of select Stihl chainsaw models, this chain drops in without modification. Before ordering, verify the three critical numbers — pitch, gauge, and drive-link count — against the stamp on your guide bar. A mismatch in any one dimension means the chain won’t fit safely.
Installation notes
Power down the saw and remove the battery or disconnect it from power before servicing. Remove the side cover or bar-cover plate to expose the bar and sprocket. Slide the worn chain off the bar groove and sprocket, noting the direction of the cutters. Install the new chain with cutting teeth facing forward on top of the bar. Reattach the cover and adjust chain tension — the chain should pull slightly away from the bar rail and snap back without sagging.
Common questions
Q: Will this 18 inch chainsaw chain fit my STIHL chain that’s marked 3639 005 0068 / 26RS68?
Yes, this chain is made to match STIHL 3639 005 0068, also listed as 26RS68 or 26RS 68, for an 18 inch bar setup. If your current chain carries one of those exact numbers and your saw uses that same bar/drive link configuration, this is the correct replacement.
Q: Do I need to do anything special when installing this 18 inch chain on my bar?
When installing it, make sure the cutter edges on the top of the bar are facing forward and then set the chain tension so the drive links stay engaged in the bar groove while the chain still pulls around by hand. After a few minutes of cutting, recheck the tension because a new chain will usually stretch slightly during initial use.
Q: How should I maintain this 26RS68 chain to keep it cutting well on my 18 inch bar?
Keep it properly sharpened, maintain correct chain tension, and make sure your bar oil system is flowing well so the chain and bar stay lubricated. It also helps to inspect the bar groove and drive sprocket for wear, because a worn bar or sprocket can cause even a correct 26RS68 chain to cut poorly or wear out faster.
