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castle nuts, also known as slotted nuts or castellated nuts, are specialized nuts that are designed with slots or notches on one end. these nuts are used in applications where a secure and reliable fastening is required, especially in situations where vibration or rotation might cause a standard nut to loosen.
the unique feature of castle nuts is the presence of slots or notches on one side, which are aligned with a hole or cotter pin drilled through the bolt or stud. once the nut is tightened to the desired level, a pin or cotter pin is inserted through the aligned slots to prevent the nut from loosening due to vibrations or rotational forces.
castle nuts are commonly used in various industries, including automotive, machinery, and aerospace. they are frequently employed in critical assemblies such as suspension systems, wheel hubs, steering linkages, and other applications where secure fastening is essential for safety and reliability.
these nuts are typically made from materials such as steel, stainless steel, or other alloys, depending on the specific application requirements. they are available in different sizes and thread types to accommodate a wide range of bolt or stud sizes.
when using castle nuts, it is important to ensure proper alignment of the slots with the cotter pin hole and to follow the manufacturer's torque specifications. regular inspection and maintenance are necessary to ensure the castle nuts remain securely fastened and that the cotter pins are in place. castle nuts provide a reliable and effective fastening solution, offering added security and peace of mind in critical applications where nut loosening is a concern.

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