Trojan Special Fasteners Ltd can manufacture all manner of slotted and castle nuts.
Castle nuts are typically hex nuts with usually 6 slots (60 degrees apart) in a reduced diameter round section above the wrenching part. When a castle nut (or any radially slotted nut) is applied to a threaded section, it is assumed that the rod has a hole drilled in it, into which a cotter pin, a lock wire or a spring pin is typically inserted to stop the nut from rotating.
These kind of nuts are unsuitable when a specific preload is required because the torque can't be fine-tuned - a result of rotating a nut to align it with a hole for pin insertion. Additionally, such nuts require an additional component and alignment time.
Typically split pins, cotter pins, R clips or safety wires can be used to stop the castle nut from loosening.
In addition to standard preferred sizes, we also manufacture non preferred and non standard or special thread and nut forms and sizes.
Predominantly these forms exist: