Bolt-Type Shackle
Bolt-type shackles are heavy-duty connectors used for permanent or long-term rigging, like in crane operations, offshore lifting, and heavy transport, because their Nut-and-Cotter Pin closure provides superior security against loosening from vibration or sliding loads, unlike quicker screw-pin types. They are ideal for critical, long-duration lifts where safety is paramount, but require tools for installation/removal, making them less convenient for quick, temporary jobs.
A Bolt Type Shackle is a more secure version used in Tower Down Guys because with a Nut-and-Cotter Pin securing the shackle pin, they remain closed even when subject to Erection, Take-down, Vibration, Ice Buildup and Rotation.
Round Pin Shackle
Round pin shackles are used for simple, in-line connections in towing, tie-down, and general material handling, where loads are straight, not sideways (side-loading), and the pin can experience twisting/torque; they're quick to use with a cotter pin but not for overhead lifting or multi-leg rigging, where more secure bolt-type shackles are preferred for long-term/permanent use to prevent the pin from loosening. A Round pin shackle consists of a round unthreaded pin that easily slides through the ears of the shackle and is secured in place with a cotter pin. They work well in applications where the pin may be subjected to torque or twisting.
