AIA NAS970 PDF

Purpose: This specification pertains to the standardization of tool holders—basic for numerically controlled machine tools. The requirements contained herein are intended to provide a high degree of tool holder interchangeability between machine tools of various types within the same classification in terms of size, torque, RPM, accuracy, etc.

Classification: This specification covers tool holder—basic standards applicable to all types of numerically controlled machine tools. Loading and exchange of these tool holders may be accomplished by either manual or mechanical means. Tool holders are assigned to classification series in terms of the basic geometric shape that joins the machine tool. Established tool holder series are listed herein under 4.2.

Revision and Amendment 

As warranted, the classification, scope, and related portions of this specification may be expanded to provide additional tool holder—basic series. 

As warranted, this specification may be modified to provide for "state of the art" development.