Hazet 2019 Tool Catalogue

5000 CT 6000 CT sTAC sTAC b c a 267 Components and spare parts from page 474 to 482 Valid until December 31, 2019 Torque technology Increased screw connection quality through improvement in the screw tightening The complete screw connection is only OK (Fig. c ) if the torque and rotation angle are both OK Important: In particular for the joints using threaded fasteners of the category A (according to VDI guideline 2862), e.g. belt, airbag or rotor blades for wind energy plants! Figure 1: The torque is reached, but the rotation angle isn’t. – Possible causes: • Use of an incorrect screw that is too long. • The component to be screwed is too thin, screw or nut is stuck in the end of the thread. • The head and / or thread friction are too high because the surfaces are too rough and the screw has possibly “jammed”, for example. The coating of the screw is not correct because a screw with a different coating was used or the coating is incomplete. There is not sufficient lubrication or an incorrect lubricant has been used. • Screw or thread is damaged. • Thread is incorrectly cut and not deep enough. • There are chips from the thread cutting in the blind hole. • A washer or a seal has been forgotten and the screw is in place. Figure 2: The rotation angle is reached, but the torque isn’t. – Possible causes: • Use of an incorrect screw that is too short and the thread has been ripped out. • Use of an incorrect screw with insufficient strength. • The head and / or thread friction are too low because the screw coating is incorrect. • Use of an incorrect screw. • Use of an incorrect lubricant. • The screw or the thread is damaged and the thread has been ripped out. • Installation of an incorrect seal that is too soft. Torque Torque Torque Torque O k Rotation angle not OK. Torque not OK. Rotation angle O K. Rotation angle Rotation angle Rotation angle Torque O K Rotation angle O K. Spanners Impact wrench Accuracy / Precision of the screw connection ➧ ➧ ➧ ➧ ➧ ➧ Torque controlled tightening process Torque + Rotation angle controlled tightening process Machine-operated tightening process, not monitored Manually operated tightening process, not monitored