Warding files are machinist’s files and are frequently used by locksmiths. They are named after the shaped openings in keyholes that act as a barrier to lock picking, as they are used to both deburr and repair them.
They can also be used to file the notches in a key that allow it to fit into the warding.
What are the characteristics of a warding file?
Cross section
Warding files have a slim, rectangular cross section.
Profile and cut
They taper in width towards the point. They are double cut on both faces and single cut on both edges.
It is their tapered faces and thin profiles that make them ideal for finishing and deburring in the narrowest of spaces.
Size
Warding files are usually available in lengths from 100mm (4 inches) to 250mm (10 inches).
Swiss or American?
Warding files can be either Swiss or American pattern.