The serrated thickness is indicated by the number of teeth per 25mm length on the saw blade. From 14 to 18 teeth are coarse teeth, 24 teeth are middle teeth are fine teeth. The serrated thickness can also be divided by the size of the tooth spacing: T = 1.6 mm for thick teeth, T = 1.2 mm for middle teeth, and T = 0.8 mm for fine teeth.
Selection of blade thickness
1, The thickness of the saw blade shall be selected according to the hardness and thickness of the material.
2, sawing soft material(such as copper, aluminum alloy, etc.) or thick material, should be used, because there is more sawdust, requires a larger space.

3, when cutting hard material(such as alloy steel) or thin plate, thin pipe, should choose fine tooth saw blade, because the material is hard, serrate is not easy to cut people, the amount of sawdust, do not need large space; When saw thin material, Sawtooth is easy to catch by the workpiece and collapse, need to work at the same time the number of teeth, make Sawtooth bear less strength.
4, When sawing medium hardness material(such as ordinary steel, cast iron) and medium hardness of the workpiece, generally choose the middle tooth saw blade.