A shackle is a piece of hardware, typically U-shaped and made of metal, used to connect various rigging components. It’s a crucial link in lifting, securing, and towing applications. Shackles consist of a body (the U-shape), a pin, and sometimes ears (where the pin is inserted).
Types of Shackles:
Bow (or Anchor) Shackles:
These have a rounded shape and are designed for lifting and connecting multiple rigging components.
Chain Shackles:
These have a D-shaped body and are typically used for connecting chains.
Screw Pin Shackles:
Feature a threaded pin that screws into the shackle body, offering a secure connection.
Bolt Type Shackles:
Utilize a bolt, nut, and cotter pin for a more robust and secure connection, often used for semi-permanent or long-term applications.

Key Components:
Bow/Body: The curved part of the shackle.
Pin: The removable bolt that secures the shackle.
Ears: The parts of the shackle body where the pin is inserted.
Shoulder: The part of the pin that makes contact with the ear when fully tightened.
Common Uses:
Lifting: Connecting slings, chains, or ropes to heavy loads.
Towing: Connecting towing equipment to vehicles.
Securing: Fastening cargo, equipment, or livestock.
Rigging: Connecting various components in rigging systems.
Important Considerations:
Working Load Limit (WLL):
Shackles must be branded with their WLL and should not be used for loads exceeding this limit.
Material:
Shackles are available in various materials, including carbon steel, alloy steel, and stainless steel, each suited for different environments and applications.
Inspection:
Shackles should be inspected regularly for wear, damage, and proper function before each use.