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ISO 5393:2017 specifies a laboratory performance test method for power assembly tools (referred throughout the document as "tool") for installing threaded fasteners. ISO 5393:2017 provides a method for the measurement of torque repeatability (scatter) - over a range of torque rates as specified in this document, - over a range of torque adjustment as defined by the manufacturer, and - over a number of operating cycles as defined by the manufacturer. ISO 5393:2017 provides a method for the measurement of the precision of the built-in torque measurement system for tools incorporating such a feature. See Annex E. ISO 5393:2017 gives instructions on equipment parameters, what to test for and how to evaluate and present the test data. ISO 5393:2017 is applicable to tools - of any power source, e.g. pneumatic, hydraulic, and electric, including battery-powered, - which apply torque in a generally continuous manner, and - within the torque range 0,5 Nm to 2 000 Nm. Outside this range, it is acceptable to modify the test method providing that the modification is documented in the test report. ISO 5393:2017 is not applicable to - impact or impulse wrenches, - ratchet wrenches or wrenches with ratcheting clutches, and - other tools which advance fasteners in discontinuous increments, overcoming static friction at each increment. ISO 5393:2017 allows a test to be performed at any test torque level; however, in order to minimize the number of test joints necessary for a wide range of test torque levels, a list of preferred test torque levels is provided in Annex A.