Although you are able to sharpen your chain saw chain to keep it cutting easily, if any part of the series is broken or chipped you’ll want to replace the chain completely. Even if your chain doesn’t show any signs of damage, you should replace it after numerous sharpenings. Lowe’s recommends replacing the chain if the longest portion of the cutting tooth is less than 4 mm. The Stihl company stamps its chains using a number, called a Marketing Number, which can help you determine the size of the series.
The Marketing Number stamped on the side of the series. This amount contains four or five characters, which might be letters or numbers.
Determine the pitch of the chain, which is the distance between three rivets split by two, by locating the initial digit at the Marketing Number stamped on the side of the series. A 1 means the pitch is 1/4-inch, 2 equals a 0.325-inch pitch, 3 corresponds to a 3/8-inch pitch, 4 equals a 0.404-inch pitch, 6 equals a 3/8-inch extended pitch to get a Stihl Picco and 7 equals a 1/4-inch extended pitch to get a Stihl Picco.
By locating the number find the gauge of the chain. A 1 equals a 0.043-inch gauge, 3 equals a 0.050-inch gauge, 5 corresponds to a 0.058-inch gauge, 6 means the series has a 0.063-inch gauge. A 0 means the series has a 0.080-inch gauge, but this judge size is found only on the Harvester series.
Determine the product type by locating the next character in the Marketing Number. An R means the series is a Stihl Rapid, while a P stands for Stihl Picco.
Locate the fourth character in the Marketing Number to ascertain the product shape of the series. A S stands for superb, or complete chisel, an M means micro, or semi chisel, a D stands for duro, or carbide tip, and also an R stands for saving, a distinctive chain designed for the MS 460 R Stihl Magnum Rescue.
If the chain has some qualities determine. The previous number or letter stamped on the series corresponds to some distinctive characteristics. A 1 means the series has a triple-humped tie strap onto a Picco Micro series, a 2 means the series has a triple-humped tie strap onto a rapid micro chain and 3 corresponds to a single-humped push link. A F as the previous character usually means the chain is complete skip, H means it is a semi dumpster or half skip, K means it is a timeless cutter design and L means it is a square ground chisel. Letter M means the series is a miniature, MM stands for miniature micro, N means thin and S stands for special.