Sling: A rigid lifting device for lifting operations.
Rigging: When lifting items, a flexible combination of lifting devices attached to the structure becomes a rigging or sling.
Lifting tools can directly lift items, mainly including hooks, grab buckets, clamps, suction cups, and specialized lifting tools.
The composition of rigging is generally composed of high-strength flexible components (steel wire ropes, lifting chains, artificial fiber belts, etc.) combined with end rings, hooks, shackles, etc.
The ultimate working load of a sling: refers to the maximum mass that a single sling is allowed to bear when vertically suspended under normal usage conditions.
Rated lifting capacity of the lifting appliance: Under normal usage conditions, the lifting appliance is allowed to bear the maximum mass of the item when vertically suspended.
The safe working load of a sling: Except for vertical suspension, there is an angle between the lifting point of the sling and the object, which changes the force on the sling. The maximum allowable mass that the sling can bear under a specific suspension method. The maximum safe working load of a sling.