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ISO 6789-1-2017 “Assembly tools for screws and nuts - Hand torque tools - Part 1: Requirements and methods for design conformance testing and quality ISO 2017. Assembly tools for screws and nuts —. Hand torque tools — 6789-1. First edition. 2017-02. Reference number. ISO 6789-1:2017(E). ISO 6789-2:2017. Assembly tools for screws and nuts - Hand torque tools - Part 2: Requirements for calibration and determination of measurement uncertainty. Revision to BS EN ISO 6789:2003 to take into account ISO requirements for calibration with greater emphasis on the inclusion of uncertainties,ISO 6789-2:2017 specifies the method for the calibration of hand torque tools and describes the method of calculation of measurement uncertainties for the