Chainsaw chain basics
Chainsaw chain orientation
On top of the bar, the sharp edge faces forward (i.e. away from the operator).
Chainsaw chain direction of rotation
Gray arrows shown on the picture above indicate the direction of travel.
Chainsaw chain parts
Chainsaw chain dimensions:
Gauge is the thickness of the drive link tang, and also the nominal width of the chain groove on the chainsaw bar.
0.043", 0.050", 0.058", and 0.063"
Pitch is a nominal number describing how close together links are on the chain.
Modern chainsaw chains come in 1/4", .325", 3/8", and .404" pitches.
Lenght of a chainsaw chain is determined by the number of drive links, "56" or "56DL" for example.