Key relevance

Key Relevance in Locksmithing and Machining
– Key relevance measures the difference between an original key and its copy.
– It refers to the similarity in size and shape between the two keys.
– Key relevance can also be used to measure the fit between a key and its paired lock.
– Even keys made from the same mold or machine will have minute differences in shape.
– The allowable tolerance in locksmithing is determined by the range of differences between key sizes and the lock.
– Key relevance is a measure of similarity between machined parts that interlock.
– It is sometimes used in mechanical engineering to refer to fit between parts.
– However, tolerance or backlash is more commonly used in this context.
– Key relevance is not applicable to digital-coded radio signals as they require precise unlocking codes.
– It may be applied to electronic locks to refer to similarities in magnetic signatures or radio codes.

Related Concepts and Terms
– Margin of error is a related concept to key relevance.
– Process capability is another term associated with key relevance.
– Specification refers to the design shapes and sizes of keys.
Engineering tolerance is important in machining work and key relevance.
– Tolerance stacks are used to analyze the cumulative effect of tolerances in assemblies.

Typical Key Relevance Requirements
– Modern keys usually require a key relevance of approximately 0.03mm to 0.07mm.
– This translates to an accuracy within 0.75% to 1.75%.
– The acceptable level of tolerance for key relevance is considered to be high.
– Key codes do not provide information about key relevance.
– Minute differences in key shapes can result in differences in key relevance.

– Mick, Friend. The Encyclopaedia for Locksmiths.
– ASTM engineering specification standards.
– Conway, Hugh Graham. Engineering Tolerances: A Study of Tolerances, Limits and Fits for Engineering Purposes.
– Rudman, Jack. This is Your Locksmith Passbook.

Not applicable (there is no additional content that can be grouped together)Sources: