What is the difference between 18-inch and 20-inch chainsaw chains?

The difference between 18 inch and 20 inch chainsaw chain

Saw chain parameters mainly include pitch, thickness of intermediate guide teeth, and shape of cutter teeth.

1. Pitch: The pitch of the saw chain is the distance of 3 rivets divided by 2; it corresponds to the pitch of the sprocket. Including 1/4, 0.325, small 3/8, large 3/8, 0.404 (in inches; 1 inch = 25.4mm).

2. Thickness of the middle guide tooth: corresponding to the width of the guide groove of the guide plate. Includes 0.043, 0.050, 0.058, 0.063 (in inches; 1 inch = 25.4mm).

3. Tooth shape: Determines the smoothness of the cut wood. Including rounded corners, right angles, and arcs.