Factory direct high-strength stainless steel nuts hex nuts hex nuts nuts nuts and bolts, screws with the use of mechanical action from the connections are tight. One by one type 1 six most widely used nuts, C-class nut for surface rough, less demanding on the accuracy of machines, equipment or structures; A grade and B-grade nuts for relatively smooth surface for high precision machinery, equipment or structure. Type 2 hexagonal nut thickness M thick, often frequently used for assembly and disassembly of the occasion required. Hexagon thin nut M thin thickness, used to be connected parts of the surface of the space-constrained applications. Grade production of materials: 40CR, 45 steel, 35K, stainless steel, Q235 (A3 steel), and other hardness rating: 4 5 6 8 10 12. Use 1, ordinary hex - used widely, is characterized by relatively large tightening force, the disadvantage is to have enough room for maneuver when installing to, you can use the wrench or open-end wrench installation, or more glasses spanner wrench is required a lot of room. 2, the inner cylinder head socket - is the most widely used of all the screws, because he is relatively large fastening force, within the Allen key can operate, easy to install, almost used in a variety of structures, look more beautiful and neat, The disadvantage is that the tightening force tip less than 1.6, in addition repeated use easy to damage caused can not be removed within the hexagon. 3, the inner disk Hexagon - rarely used on machinery, mechanical properties above, mostly used in the furniture, the main role is to increase the contact surface with the wooden material and increase the appearance of ornamental. 4, is no Hex - must use certain structures, such as the need top tight top wire structure great force, or need a place to hide the cylinder head. 5, countersunk head Hexagon - mostly used in power machinery, the main role with the same hex-6, nylon locking nut - hexagon mosaic nylon apron in flour to prevent thread loosening structure, the mechanical strength of the force . 7, flange nuts - mainly serve to increase the role of contact with the workpiece surface, mostly used in the pipe, fastener has a number of stampings and castings. 8, ordinary hex nuts - the most widely used, is one of the most common general fasteners. Stainless steel U-bolts / U type screw / riding screw / U-shaped bolt / U type code / U Type Wire