A knurled nut is a specialized fastener featuring a textured, ridged pattern on its outer surface. This distinctive knurled design serves two main purposes - it enables easy manual tightening without tools when used as a thumb nut, and it provides secure anchoring when embedded into handles or covers as an insertion nut.

These versatile fasteners are particularly valuable in applications requiring frequent assembly and disassembly, such as access panels or adjustable components, where structural strength is not a primary concern.