Tools for Key Impressioning

Impressioning

The tools most often used in impressioning keys are those that make up this category. Tools of this nature include the following (click the hyperlinks for details and to purchase):

Impressioning Files Set HPC Model KFS-6
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Fine Impressioning File HPC Model IFH-4

Impressioning is fast becoming a lost art. Old time Locksmiths used it daily, and I know of several who even today create first keys with a file instead of a code cutter. It is a technique that is as basic to Locksmithing as lock picking, but because there are so many ways to originate keys without using a file it is being ignored more and more.

A good impressioner can prepare a key blank by running a fine file along the edge of the blade a few times and then inserting the key blank into the lock by hand, turning it slightly, and wriggling it up and down with only the strength in his fingers. This of course is not the technique taught to new Locksmiths as it requires a good deal of experience and wisdom acquired through age.

The proper way to do Impressioning is to prepare the blank either by running the file along the edge as stated above or by putting it in a code cutting machine and skimming just a thousandth or so off the edge of the blade. This leaves a pure, smooth surface. Some Locksmiths prefer to file a V shape in the blade, leaving a knife-edge. Others swear by the opposite plan . . . leaving a flattened surface along the edge.

The Impressioning file is used to deepen each station of the key after the key is inserted into the lock with a pair of Impressiong pliers (usually a common pair of Vise Grip pliers). The key is rocked up and down and also subjected to a bit of turning pressure . . . more or less depending upon individual technique and the level of difficulty the lock presents.

The art involved in impressioning is detecting and interpretting the marks that are so acquired. When a mark is determined to be authentic, the file is used to deepen the cut, shaping it so as to form sloping sides so the key will not become trapped in the lock. The difficulty inherent in this whole procedure is that the Locksmith has no way of knowing if he has cut any one of the five or six stations too deep. That can only be determined by continuing on until it becomes evident that all the stations are near the maximum depths.

It is generally easier to impression wafer tumblers than pin tumblers, so it makes sense to start by practicing on small desk or cabinet locks that use wafer, or disk, tumblers. You will find that having several tools for key impressioning in your shop will be an unexpected benefit as over time most every Locksmith takes up this invaluable skill.