Section R. 408.11825 - Hooks; load blocksRule 1825.
(1) A crane hook shall be discarded if either of the following provisions applies: (a) The throat opening is more than 15% greater than the manufactured size.(b) The hook has more than a 10-degree twist from a vertical center line drawn through the hook socket.(2) A hook shall be equipped with a latch, unless the application makes the use of a latch impractical as determined by a qualified person. When required, a latch shall be provided to bridge the throat opening of the hook for the purpose of retaining slings, chains, or other equipment, under slack conditions.(3) Load blocks shall be of the enclosed type and shall be guarded against rope jamming during normal operations.Mich. Admin. Code R. 408.11825