NA 121

DIN Standards Committee Tools and Clamping Devices

Standards [CURRENT]

DIN ISO 7388-1
Tool shanks with 7/24 taper for automatic tool changers - Part 1: Dimensions and designation of shanks of forms A, AD, AF, U, UD and UF (ISO 7388-1:2007)

Title (German)

Werkzeugschäfte mit Kegel 7/24 für automatischen Werkzeugwechsel - Teil 1: Maße und Bezeichnung von Schäften der Formen A, AD, AF, U, UD und UF (ISO 7388-1:2007)


The International Standard ISO 7388-1 has been prepared by Technical Committee ISO/TC 29 "Small tools", the secretariat of which is held by AFNOR (France), with the participation of German experts of Standards Committee "Tools and Clamping Devices" (FWS) at Working Committee NA 121-02-05 AA "Werkzeugaufnahmen und Schnittstelle Maschine/Werkzeuge" ("Tool holders and machine/tool interface"). This document replaces the previous national standard DIN 69871-1:1995-10 for tool shanks and specifies the dimensions of tool shanks with a 7/24 taper, of shank forms A, AD, AF, U, UD and UF (with two possible additions for each), for automatic tool changers, used on machines having an automatic gripping system for feeding tools from the magazine to the spindle and vice-versa. These tools are designed with the most important dimensions for use in spindle noses according to ISO 9270.

Document: references other documents

Responsible national committee

NA 121-02-05 AA - Tool holders and machine/tool interface 

Responsible international committee

ISO/TC 29/SC 9 - Tools with defined cutting edges, holding tools, cutting items, adaptive items and interfaces 

Edition 2014-07
Original language German
Translation English
Price from 52.30 €
Table of contents


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