What Are Hexagonal Nuts? Hex nuts are used to match screws and bolts to help secure items. They have a hexagonal body whose flat portion can be grasped with a wrench for turning to tighten and loosen in a fastening application. For ease of assembly and disassembly, hex or hex nuts are the most common types of nuts. Hex nuts are measured in metric or imperial units. Common sizes include internal thread size and pitch width of the span.Made of stainless steel 18-8 (304), which have superior rust resistance and excellent oxidation resistance, can ensure long time using.A Hexagon Nut is designed to be installed to the end of a Hexagon Bolt or other Precision Screw, and generally holds a fastener in place when used alongside an unthreaded hole. 18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.Specialist features include flanges, domes, and nylon locking inserts.Hexagon Nuts are intended to be used in conjunction with screws and bolts to provide secure fastenings into unthreaded holes.designed for the basic fastening requirements which are often suitable for most applications.100 Pieces, enough quantities. Ideal for use by a variety of workers and repairmen from plumbers to assemblymen both professional and amateur.Note:Small parts, keep it away from children and babies.