This document specifies a laboratory performance test method for hydraulic impulse and electric impulsing tools for installing threaded fasteners in a laboratory environment, and for power assembly tools (referred throughout the document as “tools”) for installing threaded fasteners. It gives instructions on the procedure, performance parameters to test and how to evaluate and present the test data.

It also provides a method for the measurement of torque repeatability (scatter)

•     over a range of torque rates as specified in this document, and
• over a range of torque adjustment as defined by the manufacturer.

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, such as pneumatic or electric, including battery-powered,
• which apply torque in discontinuous increments, and
• within the torque range 0,5 N·m to 800 N·m. 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 wrenches, and
• ratchet wrenches or wrenches with ratcheting clutches.

The relationship between torque measurements and clamp force-based tests is commented on in Annex A.

The use of tools using discontinuous operation of the motor to provide torque impulses is discussed in Annex B.

It requires manufacturers to perform tests over their defined torque range of the tool; however, it allows users to perform single point tests 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 C.