What safety standard applies to the twist allowance of crane hooks?

The safety standard that applies to the twist allowance of crane hooks is ASME. ASME, or the American Society of Mechanical Engineers, provides guidelines and standards for the design, construction, and maintenance of various mechanical systems, including cranes and lifting devices. Specifically, ASME B30.10 – "Hooks" outlines the requirements for hooks used in hoisting and lifting applications, including considerations for twist allowance.

Twist allowance is crucial because excessive twisting can compromise the integrity of the hook and safety during lifting operations. Understanding and adhering to the ASME guidelines ensures that crane hooks are used safely and effectively, minimizing the risk of accidents on the job site. The other standards mentioned, such as ANSI (American National Standards Institute), OSHA (Occupational Safety and Health Administration), and ISO (International Organization for Standardization), focus on broader safety and operational guidelines, but ASME is the one that specifically addresses the details related to the structural aspects of crane hooks, including twist allowance.