What is a Try-Out Key?

A try-out key is a specially cut locksmith key used to open pin tumbler locks without the original key, by testing a series of pre-cut key blanks until one aligns the pins at the shear line. Try-out keys are typically sold in graduated sets, with each key in the set cut to a slightly different depth or pattern, covering the common cut combinations used in a particular lock brand or keyway. Locksmiths rely on try-out key sets as a fast, non-destructive alternative to lock picking, especially on residential and older commercial cylinders.

How to Use a Try-Out Key

Using a try-out key set is a straightforward trial-and-error process:

• Identify the lock brand and keyway to select the correct try-out key set

• Insert the first key in the sequence into the lock and apply light rotational pressure

• If the lock doesn't turn, remove the key and try the next one in the set

• Continue working through the set in order until a key aligns the pins and turns the cylinder

• Once the correct key is found, the lock can be opened, and in many cases that key can also be used to cut a replacement

Locksmiths often work through a try-out key set methodically, from the most common cut depths to the least common, to open the lock as quickly as possible.

What is a Try-Out Key Used For?

Try-out keys are used primarily for opening locks when the original key is lost, broken, or unavailable. They give locksmiths a way to gain entry without picking, drilling, or damaging the lock, which is especially valuable when the customer wants to keep using the existing hardware afterward. Try-out keys are also used to identify the internal pinning of a lock, since finding the working key reveals the lock's cut combination.

How Does a Try-Out Key Work?

A try-out key works by testing different key cuts against the internal pin stack of a lock cylinder. Each pin tumbler lock has pins set to specific depths that must be pushed to the exact shear line for the plug to rotate. Because most locks within a given brand or keyway are manufactured using a limited number of standard cut combinations, a try-out key set can cover the majority of possible combinations with a manageable number of keys. When a key in the set matches the lock's pinning, the pins align at the shear line and the plug turns, opening the lock.

What Are the Common Uses of Try-Out Keys?

Try-out keys are commonly used in the following situations:

• Opening residential deadbolts and knob locks when keys are lost

• Servicing older lock brands with a limited number of standard cut combinations

• Opening file cabinets, desks, and low-security furniture locks

• Determining the working key combination for duplication purposes

• Fast, non-destructive lockout response on service calls

Main Characteristics of Try-Out Keys

Try-out keys share several defining characteristics:

• Sold in graduated sets covering a range of common cut depths

• Matched to a specific lock brand, keyway, or lock type

• Designed for repeated, non-destructive insertion and testing

• Often stamped or numbered for quick identification within a set

• Compact and easy to carry alongside other locksmith tools

These characteristics make try-out keys a practical, low-cost addition to a locksmith's toolkit.

Advantages of Try-Out Keys

Try-out keys offer several advantages over other opening methods:

• Non-destructive – the lock and door remain undamaged, unlike drilling or forcing

• Fast on familiar locks – experienced locksmiths can open common cylinders in seconds

• No power or electronics required – purely mechanical, with nothing to charge or calibrate

• Cost-effective – a single set can service many locks within the same brand or keyway

• Simple to learn – requires less technique than lock picking, making it accessible for newer locksmiths

CLK Supplies stocks try-out key sets for popular residential and commercial lock brands, alongside the key machines, pinning kits, and lock picks locksmiths use for fast, professional lock service.