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The difference between a screw pin shackle and a bolt-nut and cotter pin shackle lies in their respective methods of securing the pin in place. Here's a breakdown of each type:
Screw Pin Shackle: A screw pin shackle, also known as a screw pin anchor shackle, features a removable pin with a threaded end. The pin is inserted through the shackle's ears, and the screw portion is tightened by hand to secure it in place. The threaded end of the pin engages with the shackle body, creating a secure connection. Screw pin shackles are easy to assemble and disassemble, making them convenient for various applications. However, they may be susceptible to accidental loosening if not properly tightened or secured.
Bolt-Nut and Cotter Pin Shackle: A bolt-nut and cotter pin shackle, often referred to as a safety bolt shackle or simply a bolt shackle, uses a different method of securing the pin. Instead of a threaded end, the pin has a bolt with a nut. Once the pin is inserted through the shackle ears, the nut is tightened onto the bolt, ensuring a secure fit. To provide additional safety and prevent the pin from loosening, a cotter pin or split pin is inserted through a hole in the bolt, securing it in place. This design offers added security and reduces the risk of accidental loosening compared to screw pin shackles.
It's important to note that both types of shackles are commonly used in lifting and rigging applications. The choice between a screw pin shackle and a bolt-nut and cotter pin shackle depends on factors such as the specific application requirements, the need for frequent assembly and disassembly, and the desired level of security. Manufacturers' recommendations and industry standards should be followed to ensure the appropriate selection and safe use of shackles in specific lifting and rigging operations.
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