NBN ISO 5393:2021

This document specifies a laboratory performance test method for power assembly tools (referred
throughout the document as “tool”) for installing threaded fasteners.
It 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.
It 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.
It gives instructions on equipment parameters, what to test for and how to evaluate and present the
test data.
It 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.
It 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.
It 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.