Which statement about the safe use of shackles is NOT true?

The statement that screw pins should be backed off two turns is not true in relation to the safe use of shackles. In fact, screw pins should be fully tightened to ensure that they do not come loose during lifting operations. A properly secured screw pin helps maintain the connection between the shackle and the load being lifted, which is critical for safety.

Each of the other statements emphasizes important safety practices. Shackles should always be inspected before use to identify any damage or wear that could compromise their integrity. Additionally, shackles must be rated correctly for the intended load to ensure they can safely handle the weight and stresses involved in lifting. Locking shackles when in use prevents accidental disengagement, contributing to safer lifting operations. Understanding these aspects ensures that ironworkers prioritize safety and effectiveness in their tasks.