scope:

Object and Scope.

This standard establishes ( 1) American standard practice for the slope of self-holding and steep machine tapers, (2) the detailed dimensions for this type of taper tool shank, (3) the corresponding dimensions for the taper socket in the spindle of the machine, including the dimensions of keyways.

The purpose of a machine taper is to provide a connection between the tool, arbor, or center and its mating part which will insure and maintain accurate alignment between the parts and yet permit the parts to be readily separated for reconditioning or for the substitution of other parts.

This standard as published includes the tapers which are presented as the recommended standard for application where either self-holding or steep tapers are desired. An appendix to meet the demands for an authoritative source for data on such tapers as are sometimes used by industry and lie outside the stan· dard has been added.