Torque bolts must be installed with an electric torque wrench. Only when the torque reaches the required level should the梅花head of the bolt be turned out, ensuring that the bolt used has the necessary preload to guarantee performance. Therefore, in engineering, checking if the梅花head is still intact can determine if it is a bolt, and twisted-type bolts can be used once.

Cautionary Notes for Using Twisted Bolt

Initial torque application can be done using either an electric torque wrench or a manual ratchet wrench with a click. However, regardless of the wrench used, calibration is required prior to work to control the initial torque value. When a manual wrench is used as the final torque tool, calibration must be performed at the start of each shift, and calibration records should be kept. Final torque wrench: The bolt is a self-tensioning type, so the final torque application simply involves removing the bolt head from the high bolt tail, no calibration is needed for the wrench.

When tightening with a wrench bolt, attention must be paid. The electric wrench switch can only be pressed down when the梅花head is fully inserted into the sleeve. If the inner sleeve is only inserted to 1/3 to 1/2 of the梅花head size, pressing the electric wrench switch will cause the梅花head to slide, affecting the service life of the sleeve. When tightening, the electric wrench should be perpendicular to the friction surface of the component. The梅花head at the bolt end is prone to sliding and blocking when the wrench is tilted.