The Square Nut is a traditional type of nut featuring a simple four-sided shape with equal width. It is threaded through its center hole.

The slotted nut ,commonly known as Castle nut . is a specialized fastener recognized by the radial slots (or "castellations") cut into its top cylindrical section.

The hex thin nut ,commonly known as hex jam nut or lock nut , is a type of hex nut distinguished by its reduced height—typically about half the thickness of a standard hex nut.

The Thick Hex Nut, also known as a Heavy Hex Nut, is a standard mechanical fastener defined by its greater thickness (height) compared to a standard hex nut of the same nominal diameter.

The hex nut, also known as a hexagon nut, is one of the most fundamental and universally used fasteners. It is characterized by its six-sided (hexagonal) shape and a centrally threaded hole.