DIN EN ISO 6789-1:2017-07

The standard DIN EN ISO 6789:2003:10 has been split to provide two levels of documentation. It recognizes the different needs of different users of the standard. DIN EN ISO 6789 now consists of the following parts under the general title "Assembly tools for screws and nuts - Hand torque tools - Part 1: Requirements and methods for design conformance testing and quality conformance testing: minimum requirements for declaration of conformance"; - "Part 2: Requirements for calibration and determination of measurement uncertainty". Part 1 of this series of standards continues to provide developers and manufacturers with the relevant minimum requirements for the development, manufacture and documentation of hand torque tools. This part of the series of standards specifies the conformance testing and marking requirements for hand torque tools used for controlled tightening of screws and nuts. It also specifies the minimum requirements for calibration and calibration certificates for hand torque tools. The following changes have also been made: a) the output drive designation of torque tools is expanded to include hexagonal and other output drives. b) the definition of the of the torque range of the tools has been changed. c) the rate of loading (shown by the time to achieve the last 20 %) has been changed; d) the importance of avoiding parasitic forces has been emphasized. e) explanatory flowcharts for the measurement sequence of different torque tools have been added in Annex C. f) the requirement for a "declaration of conformance" to the effect that the torque tool conforms with this document has been added. g) the requirement for a "certificate of calibration" has been removed, recognizing that manufacturer's calibration certificates have not previously contained enough information to be traceable calibration certificates. h) ISO 6789 has been editorially updated and restructured. This German version has been prepared by Working Committee NA 121-05-01 AA "Schraubwerkzeuge, Fügewerkzeuge" ("Assembly tools for screws and nuts, Fastening tools") at DIN Standards Committee Tools and Clamping Devices (FWS).