Key duplication refers to the process of creating a key based on an existing key. Key cutting (after

cutting Cutting is the separation or opening of a physical object, into two or more portions, through the application of an acutely directed force. Implements commonly used for wikt:cut, cutting are the knife and saw, or in medicine and science the scal ...

, the metalworking term for "shaping by removing material") is the primary method of key duplication: a flat key is fitted into a

vise A vise or vice (British English) is a mechanical apparatus used to secure an object to allow work to be performed on it. Vises have two parallel jaws, one fixed and the other movable, threaded in and out by a screw and lever. A vise grip is n ...

in a machine, with a blank attached to a parallel vise, and the original key is moved along a guide, while the blank is moved against a blade, which cuts it. After cutting, the new key is deburred: scrubbed with a

wire brush A wire brush is a tool consisting of a brush whose bristles are made of wire, most often steel wire. The steel used is generally a medium- to high-carbon variety and very hard and springy. Other wire brushes feature bristles made from bras ...

, either built into the machine, or in a

bench grinder A bench grinder is a benchtop type of grinding machine used to drive abrasive wheels. A pedestal grinder is a similar or larger version of grinder that is mounted on a pedestal, which may be bolted to the floor or may sit on rubber feet. These t ...

, to remove burrs which, were they not removed, would be dangerously sharp and, further, foul locks. Different key cutting machines are more or less automated, using different milling or grinding equipment, and follow the design of early 20th century key duplicators. Key duplication is available in many retail

hardware stores Hardware stores (in a number of countries, "shops"), sometimes known as DIY stores, sell household hardware for home improvement including: fasteners, building materials, hand tools, power tools, keys, locks, hinges, chains, plumbing supplies, ...

and as a service of the specialized locksmith, though the correct key blank may not be available. More recently, online services for duplicating keys have become available. In the UK, the majority of the mobile locksmiths will have a dual key cutting machine on their van. The key duplication machine will be able to cut both cylinder and mortise keys, as these are the most popular types of keys in circulation. However, very few will carry a laser key cutting machine, which is sometimes needed to cut high security keys. Certain keys are designed to be difficult to copy, for key control, such as

Medeco Medeco, a subsidiary of the Sweden, Swedish Assa Abloy, Assa Abloy Group, is a Lock (security device), lock manufacturer located in Roanoke County, Virginia, United States. History Medeco traces its origins to the Mechanical Development Company, ...

; while others are simply stamped "Do Not Duplicate" to advise that key control is requested, but in the US, this disclaimer has no legal weight.

Helping Notes

Rather than using a pattern grinder to remove metal, keys may also be duplicated with a punch machine (the Curtis key clipper is a recognised example). The key to be duplicated is measured for the depth of each notch with a gauge and then placed into a device with a numeric slider. The slider is adjusted to match the corresponding measured depth and a lever is depressed, which cuts the entire notch at once. As the lever is raised the key automatically advances to the next indexed position and the slider is adjusted appropriately to the next measured depth. This cycle is continued until the key is complete. Duplicating keys by this process is more labor intense and requires somewhat better trained personnel. However, keys made in this fashion have clean margins and the depth of the notches are not subject to wear induced changes encountered when heavily worn keys are duplicated using a pattern grinder. Keys may also be made in this fashion without an original as long as the depth of each notch and the type of key blank are known. This is particularly useful for institutions with a great number of locks for which they do not want to maintain a wide variety of archived copies. Code books or on-line resources may be used to program the key clipper/punch settings from the code stamped on the lock, listed in the owner's manual, or available from the vehicle's VIN. A machine permitting rapid duplication of flat metal keys, which contributed to the proliferation of their use during the 20th century, may have been first invented in the United States in 1917 (image to the left): In recent years, dual key cutting machines have come on to the market, enabling cutting of both mortice and cylinder keys on one machine. These machines are primarily manufactured in the Far East and save a key cutter a significant amount of money compared with using two separate dedicated machines.

Do not duplicate key

A "do not duplicate" key (or DND key, for short) is one that has been stamped "do not duplicate", "duplication prohibited" or similar by a locksmith or manufacturer as a passive deterrent to discourage a retail key cutting service from duplicating a key without authorization or without contacting the locksmith or manufacturer who originally cut the key. More importantly, this is a key control system for the owner of the key, such as a maintenance person or security guard, to identify keys that should not be freely distributed or used without authorization. Though it is intended to prevent unauthorized key duplication, copying DND keys remains a common security problem.

U.S. restrictions

There is no direct legal sanction in the US for someone who copies a key that is stamped ''do not duplicate'' (unless it is an owned key), but there are patent restrictions on some key designs (see "restricted keys"). The Associated Locksmiths of America, ALOA, calls DND keys "not effective security", and "deceptive because it provides a false sense of security." deals with United States Post Office keys, and deals with United States Department of Defense keys.

Restricted key

A restricted key is a type of key that is designed to limit access to a specific area or object. These keys are typically used in high-security environments, such as government facilities, military bases, and certain businesses that require strict access control. Restricted keys are unique in that they are only able to be duplicated by authorized individuals or locksmiths who have the proper identification and authorization to do so. This helps to ensure that the key cannot be copied or used by unauthorized individuals. Some common examples of restricted key systems include master key systems, where a single key can open multiple locks within a building, and key control systems,"Key Control System-Vanma"
Vanma Supplies. Retrieved 20 Arpil 2023. which allow for precise tracking of key usage and access control. Overall, restricted keys are an important tool for maintaining security and controlling access to sensitive areas. A restricted keyblank has a keyway for which a manufacturer has set up a restricted level of sales and distribution. Restricted keys are often protected by patent, which prohibits other manufacturers from making unauthorized productions of the key blank. In many cases, customers must provide proof of ID before a locksmith will cut additional keys using restricted blanks. Some companies, such as Medeco High Security Locks, have keyways that are restricted to having keys cut in the factory only. This is done to ensure the highest amount of security. These days, many restricted keys have special in-laid features, such as magnets, different types of metal, or even small computer chips to prevent duplication. Another way to restrict keys is trademarking the profile of the key. For example, the profile of the key can read the name of the manufacturer. The advantage of a trademark is that the legal protection for a trademark can be longer than the legal protection for a patent. However, usually not all features of the profile are necessary to create a working key. By removing certain unnecessary features, a non restricted profile can be derived, allowing the production and distribution of non restricted key blanks.

Helping Notes

Do not duplicate key

U.S. restrictions

Restricted key

References

Further reading