Specification for metric keys and keyways - Parallel and taper keys

Specification for metric keys and keyways - Parallel and taper keys

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1   Scope

This British Standard relates to the following types of keys and keyways with dimensions in millimetres:
  1. 1) square parallel,
  2. 2) rectangular parallel,
  3. 3) square taper, gib-head and plain,
  4. 4) rectangular taper, gib-head and plain.
In addition, a fourth class of fit is provided in this British Standard to give an interference fit.
Three classes of fit are provided for the square and rectangular parallel keys and keyways, namely “free”, “normal” and “close”, and the dimensions and tolerances specified are in accordance with ISO Recommendations R 7733) and R 7744).