Hexagon nuts are one of the most common nuts and can be used with anchors, bolts, screws, studs, threaded rods, and any other fasteners with machine threads. Hex is an abbreviation for hexagon, which means that they have six sides.
Hex nuts are also called: finished hexagon nuts and full hexagon nuts. Lock washers with hexagonal nuts can be used with hexagonal nuts UNC and UNF threads. Hexagonal nuts threads are standardized and unified and British coarse (UNC, national unified coarse) or British unified (UNF, unified national fine) series. 
Left hex nuts are also available; see the nut on the left. The size of a hex nut refers to its nominal thread diameter. 
On the contrary, it should be at the head of the nut. Two full threads are exposed on the side to ensure that the nut can be tightened correctly. 
Unlike stainless steel and stainless steel, like brass, steel hexagonal nuts have different degrees of strength; specified by SAE (Association of Automotive Engineers). 
Bolt and nut installation Tool
 grade 2 hex nuts have the lowest grade or grade, regardless of strength or cost; grade 5 provides medium strength; grade 8 is the highest SAE grade and usually the highest price. Do not replace the graduated nuts with a lower grade or strength nuts Hexagon nuts. 
Which hex nut material is better? 
The markings on the surface indicate the grade. 
Common materials include steel (electroless plating and galvanizing; for more information, see the finish below), stainless steel, brass, silicon bronze, Aluminum, and nylon. Steel is still the cheapest material, followed by stainless steel; copper alloys (such as brass and silicon bronze) are the most expensive.
 Common finishes for steel are galvanized and hot-dip galvanized. Zinc is the most popular and cheapest commercial coating, with moderate corrosion resistance. Hexagon nut installation tool Hot-dip galvanized Hexagon nut can work for a long time. 
Hot-dip galvanized is a thick layer of zinc to prevent corrosion in harsh environments. However, when corrosion problems arise, stainless steel is a better choice. Unless it is submerged. In saltwater without free oxygen, severe pitting corrosion can occur. There are also uncoated and uncoated steel hexagon nuts, which are called smooth and rusty surfaces. 
Not all types are available for all materials and finish Always follow the manufacturer’s recommendations for repeated use of nuts, thread lubricants/locking compounds, and torque values. Combine materials and finishes for hex nuts, washers, and bolts/screws. When using hot-dip galvanized bolts and hot-dip galvanized nuts, they have oversized threads to accommodate the thick zinc layer on the bolts.