Service EN ETP TBP81-55-10
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© Atlas Copco Industrial Technique AB - 9839 0853 01
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Torque required to cause the threads of the fastener (including its head) on which torque is applied, to move relative to the mating thread.
A The actual joint
B Torque wrench
1. Perform a tightening.
2. Measure the result with the Torque wrench.
3. If the residual torque is not according to the target torque, adjust tightening parameters.
Verification of Tool Accuracy
This test procedure is made in order to verify the tool accuracy. The test is made at three different torque
levels with ten (10) tightenings performed at each torque level adding up to 30 tightenings in total. The re-
sult is compared with the reference transducer and if the deviation is within limits, the tool passes the test.
Test Conditions and Set Up
The following test conditions need to be fulfilled:
● Use an IRTT as reference transducer.
● Use a test joint with a real screw that gives increased clamp force when tightened, i.e. do not use a
brake or similar. The joint should be soft (~100
o
, the total number of pulses should be >20 during the tight-
ening).
● Do not use any extensions, only the IRTT and socket.
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