While all shackles are constructed of a pin and a body, it is important to recognize that there are different types of lifting shackles.A screwpin lifting shackle features a head at one end of the pin and a thread located at the other end. The presence of a hole on one eye of the shackle’s body and a threaded eye on the other end helps to make the shackle easy to assemble and dismantle. For this reason, the screwpin lifting shackle is often a better option for short-term applications.
The bolt shackle is often the better choice for long-term applications. With this type of lifting shackle, both eyes on the body of the shackle feature plain holes, allowing the bolt to pass through. The nut can then be secured. When it is assembly properly, the pin is left free to rotate within the body of the shackle while still remaining secure. The pins and the bodies of the shackle are provided as a matched set. Due to the differences that exist between the body holes, pin types are not typically interchangeable.
When buying shackles, it is important to consider not only the maximum working load required for the application, but also the specific dimensions that will be required in order for the shackle to be compatible with the relevant components. In most instances, the specific nature of the relevant application will be the most important determining factor in the type of pin that is necessary for the lifting shackles required. It is vital not to force a shackle that is too small onto a hook. This can result in unsafe working conditions.
In reviewing whether the selected shackle is appropriate for the relevant application, the temperature of the working conditions should be considered. This is particularly important when the lifting shackles are to be used in temperatures that exceed -40 degree C (-40 degree F) to 204 degree C (400 degree F).