What is the final (hoisting) position of the pin when using a shackle?

The final position of the pin when using a shackle is correctly identified as wrench tight. In the context of lifting operations, securing loads properly is crucial for safety. A shackle consists of a U-shaped piece with a pin that can be threaded through the loop. When the pin is tightened with a wrench, it ensures that the shackle remains secure and minimizes the risk of it disengaging during lifting.

Wrench tight means that sufficient torque has been applied to the pin, eliminating any slack and preventing it from loosening due to load vibration or movement. This is particularly important in dynamic lifting situations where the load may shift, creating forces that could otherwise dislodge a loosely fitted pin.

The other options suggest varying degrees of tightness that do not provide the necessary security. For instance, a loosely fitted pin could easily fall out or allow the load to detach, while a half turn snug or finger tight approach does not guarantee that the pin is securely fastened. Ensuring the pin is wrench tight is a best practice in rigging and material handling to ensure safe operations.