An Explanation of Hook Latches: What They Are and Their Functionality

The throat opening of a hook can be closed with a mechanical device known as a latch, as defined by ASME B30.10. The main purpose of using a latch is to reduce the possibility of the rigging becoming detached from the hook, especially in slack conditions. However, the use of a hook with a latch does not entirely eliminate the risk of accidental detachment of a slack sling or a load from the hook.

It is important to note that hook latches are not anti-fouling devices during load handling or rigging and are intended to aid in the retention of loose slings under slack rigging conditions only. Also, a latch is not designed or rated to carry a significant load, as stated by ASME B30.10.

Crosby recommends using a latch in most cases, and compliance with this recommendation is often required by standards and safety regulations, such as OSHA. Thus, using latches is considered a best practice. Crosby advises consulting and adhering to the guidance provided by ASME, OSHA, and other safety administrations.