As their name suggests, chainsaw files are used primarily for sharpening chainsaws. They are shaped to fit snugly against the cutting edge of a chainsaw’s teeth. For a step by step guide, see: How to sharpen a chainsaw with a file
However, they also have other applications, such as shaping the round sections of f-holes in stringed instruments.
What are the characteristics of a chainsaw file?
Cross Section
Chainsaw files are most often round in cross-section, but they can also have square, rectangular or diamond-shaped cross sections.
The reason they are made in different shapes is to cater for differently shaped chainsaw blades, produced by various manufacturers.
Profile
They are blunt, maintaining the width of their cross section along the whole length of the file and have a safe point.
This allows DIYers to grip the end of the file without having to worry about holding onto the teeth.
Cut
Chainsaw files are single cut on all faces (or on their only face if they are circular!)
Size
Chainsaw files are the only file that will have their width displayed. This is so you can match the width of your file to the gauge of your chainsaw.
Chainsaw files are usually available in gauges from 3.2mm (7/32“) to 6.4mm (1/4“).