What this is
Two replacement chains in the size of Stihl’s 71 PM3 64 loop, part number 3670 005 0064: 12”, 1/4” P pitch, .043” gauge, 64 drive links. Stihl’s manuals list this loop for the MSA 120 C, MSA 140 C and MSA 160 C cordless saws fitted with the 12” (30 cm) bar.
Match the loop length, not just the chain type
Stihl sells its 71 PM3 chain in several loop lengths, and the part number tells you which:
| Stihl part | Drive links | Used on |
|---|---|---|
| 3670 005 0064 (71 PM3 64) | 64 | MSA 120 C / MSA 140 C / MSA 160 C with the 12” bar — this chain |
| 3670 005 0056 (71 PM3 56) | 56 | the same saws with the 10” bar |
| 3670 005 0065, 3670 005 0072 | 65, 72 | other bars |
In these part numbers, the last digits match the drive-link count. If your old chain or its box shows 3670 005 0064, this is the same size.
Fitting it
The MSA 120 C and MSA 140 C tension the chain without tools, using a wing nut and tensioning gear. Stihl’s manual says to use Stihl reduced-kickback bars and low-kickback chains, or other listed low-kickback components. Stihl describes its own PM3 chain as low-kickback, low-profile and semi-chisel.
