# Precision shaft

Plain round shaft for linear bushings and rails.

## Geometry

A cylinder of `diameter` and `length`, axis along Z, centred on the origin. End chamfers aren't modelled: no source
gives their size.

## Source

A shaft is named by its two dimensions, so the designation is its only source: no table is involved. Sizes come from the
step.parts catalogue metadata (MIT, `library/NOTICE.md`). No fit is stated: shafts are sold in several tolerance classes,
and the catalogue names none.