|This article needs additional citations for verification. (April 2010)|
A key blank (sometimes spelled keyblank) is a key that has not been cut to a specific bitting. The blank has a specific cross-sectional profile to match the keyway in a corresponding lock cylinder. Key blanks can be stamped with a manufacturer name, end-user logo or with a phrase, the most commonly seen being 'Do not duplicate'. Blanks are typically stocked by locksmiths for duplicating keys. The profile of the key bow, or the large, flat end, often references an individual manufacturer.
Despite common belief, keys stamped with "Do not duplicate" or "It is unlawful to duplicate this key" are, with few exceptions, perfectly legal to duplicate. Some key blank manufacturers strictly restrict the sale of their own blanks. Some blanks are made only in small volumes and are not widely available.