Which component is NOT listed with a specific rated capacity?

The correct choice is that chains are typically not listed with a specific rated capacity in the same manner as the other components mentioned. In the context of helicopters and rigging, components like the screw pin clevis, apex fitting, and sling leg each have established rated capacities that indicate their maximum load limits and safety standards.

Chains, on the other hand, are used in a variety of applications and their strength can vary significantly based on the type, grade, and size of the chain. Therefore, while specific chains may have designated ratings, they are not standardized in the same way that the other components are. This lack of universal rated capacity for chains makes it essential for users to refer to manufacturer specifications or standards for individual chains to ensure safe lifting operations.