Which item is used to hold moving parts such as shackles and pelican hooks?

The item that is used to hold moving parts like shackles and pelican hooks is cotter pins. Cotter pins are fasteners that consist of a bent wire and are utilized to secure two parts together. They are especially effective in preventing components from loosening or separating under motion or vibration, making them ideal for applications involving moving parts. When inserted through a hole and bent outwards, cotter pins create a secure hold, ensuring that the moving parts remain in place and function correctly.

This characteristic is particularly important in contexts where safety is a priority, such as in rigging and marine applications. Their straightforward design allows for easy installation and removal, which is crucial in situations where frequent adjustments or maintenance might be needed.