Depth key is a specialised tool used in the field of locksmithing and lock-picking, designed for decoding and setting the correct pin depths in pin tumbler locks during the creation or duplication of keys. It consists of a key blank with incremental depth markings for each pin position, which corresponds to the specifications set by the lock manufacturer. The depth key allows for precise alignment and measurement, facilitating the accurate cutting of keys without the original key present.
The tool is predominantly utilised by professional locksmiths to ensure the functional integrity and security of a lock. The gradations marked on a depth key are calibrated to the lock's pin tumbler settings, which vary among different lock brands and models. This calibration enables the locksmith to create a key that aligns perfectly with the pin tumblers inside the lock, thus providing a seamless mechanism of operation.
Depth keys are often made from durable materials such as hardened steel to withstand the mechanical processes of key cutting and frequent use. They are crucial in situations where the original keys are lost or inapplicable, and where security systems require maintenance or rekeying without compromising the lock's integrity. The use of a depth key significantly reduces the margin of error in key cutting, enhancing the reliability and security of the lock system.