Using a hook that falls below specifications recommended by the manufacturer tempts fate. Specifically, it increases the chance for equipment failure that could lead to injuries and lost production time. Hook failure can occur for a number of reasons, including overloading, mechanical abuse of the hook or cumulative fatigue.
OSHA 1910.179 Overhead & Gantry Cranes Regulations
The following excerpt is taken directly from OSHA 1910.179.*
Hooks
Hooks shall meet the manufacturer's recommendations and shall not be overloaded.
As part of a Frequent Inspection
Hooks with deformation or cracks. Visual inspection daily; monthly inspection with a certification record which includes the date of inspection, the signature of the person who performed the inspection and the serial number, or other identifier, of the hook inspected. For hooks with cracks or having more than 15 percent in excess of normal throat opening or more than 10° twist from the plane of the unbent hook refer to paragraph (l)(3)(iii)(a) of this section.
As part of adjustments and repairs
Crane hooks showing defects described in paragraph (j)(2)(iii) of this section shall be discarded. Repairs by welding or reshaping are not generally recommended. If such repairs are attempted they shall only be done under competent supervision and the hook shall be tested to the load requirements of paragraph (k)(2) of this section before further use.
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