BS EN ISO 6789-1:2017 pdf free download.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.
ISO 6789-1:2017 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 declaration of conformance for hand torque tools.
The revision of ISO 6789: 2003 has been designed to achieve the following improvements.
ISO 6789 has been split to provide two levels of documentation. It recognizes the different needs of different users of the standard.
This document continues to provide designers and manufacturers with relevant minimum requirements for the development, production and documentation of hand torgue tool.
ISO 6789-2 provides detailed methods for calculation of uncertainties and requirements for calibrations This will allow users of calibration services to more easily compare the calibrations from different laboratories. Additionally, minimum requirements for the calibration of torque measurement devices are described in IS0 6789-2: 2017,Annex C.
The size of the output drive limits the maximum torque value of the respective torque tool. The assignment is carried out according to the values given in Table 2. For outputs not specified in Table 2, the size of the output drive is determined by the maximum torque of the respective torque tool and shall comply with the requirements given in 5.1.6 and 5.1.8.

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