M4 M8 Carbon steel Galvanised Black Plain Hexagon Nuts Zinc plating White Blue Black

M4 M8 Carbon steel Galvanised Black Plain Hexagon Nuts Zinc plating White Blue Black

 
Product Description:

Hexagonal nuts and screws, bolts, screws used in conjunction with each other, to connect the role of fastening machine parts. One of the most widely used by the 1 type of six nuts, C nuts for surface roughness, the precision requirements of the machine, equipment or structure is not high; A and B nuts for the surface is more polished, the precision requirements of the machine, equipment or structure. 2 type hexagonal nut thickness M is thicker, more often used for often need to be mounted and dismounted on the occasion. Thin hexagonal nuts are thinner in thickness M, and are mostly used on occasions where the surface space of the connected machine parts is restricted.

Hexagonal nuts in accordance with the nominal thickness is divided into I type, II type and thin three kinds of nuts above level 8 is divided into 1 type and II type two types. I type hexagonal nuts are the most widely used, 1 type of nut is divided into A, B, C three levels, of which A and B level nuts are suitable for surface roughness is small, the precision requirements of the machine, equipment and structure of the high level, while the C level nuts are used for the surface of the rougher, the precision requirements of the machine, equipment or structure; C level nuts for rough surface, the precision requirements of the high level. The thickness of type 2 hexagonal nuts is thicker, and they are mostly used in the occasions that need to be assembled and disassembled frequently.

The design of hexagonal nuts gives them good torque transmission capacity and can withstand large axial and radial loads.
1. Construction:In the construction industry, hexagonal nuts are commonly used in the connection of steel structures, steel frames and bridges to ensure the stability and safety between structural components.
2. Mechanical engineering: In the field of mechanical engineering, hexagonal nuts are used to fix various parts of mechanical equipment, such as automobiles, ships, aviation and machine tools, etc., in order to ensure the normal operation and long-term stability of the equipment.
3.Electronics:Some electronic products use snap screws, which are actually a special type of hexagonal bolt, to ensure the tightness and stability of electronic components.
4. Home maintenance:In daily life, hexagon nuts are also often used in furniture assembly, bicycle repair and other home maintenance work.
In addition, hexagon nuts have a variety of classifications and specifications to meet different engineering needs. For example, category 1 hexagon nuts have single-sided chamfers, while category 3 hexagon nuts have double-sided chamfers. Pocket nuts, which have screw holes that do not run through their profile, are commonly used for decorative purposes, especially in applications such as playground equipment where the unterminated end of the bolt may be a hazard. Butterfly nuts, on the other hand, are commonly used in applications where space is limited, such as on automobile wheels.

Applications

Cold Galvanising
Cold galvanising, also called electro-galvanising, is the use of electrolytic equipment will be fittings after degreasing, pickling, after the composition of zinc salts into the solution, and connected to the negative electrolytic equipment, the opposite side of the fittings placed zinc plate, connected to the positive electrolytic equipment connected to the power supply, the use of electric current from the positive electrode to the negative electrode of the direction of the movement of the fittings will be a layer of zinc deposition, cold galvanised fittings are processed first after the galvanisation.
1,Principle
As zinc in dry air is not easy to change, and in the humid air, the surface can generate a very dense zinc carbonate film, this film can effectively protect the internal no longer subject to corrosion. And when some reason to make the plating damage and reveal not too large base, zinc and steel substrate to form a microcell, so that the fastener substrate to become the cathode and be protected. Widely used in automotive transport and other industries, but the need for trivalent chromium passivation layer, zinc-nickel alloy plated closed coatings to reduce the hexavalent chromium passivation harmful and toxic layer.
2,Performance characteristics
Zinc plating layer is thicker, the crystallization is meticulous, uniform and non-porous, good corrosion resistance; electroplating zinc layer is purer, slower corrosion in acid, alkali and other mists, can effectively protect the fastener substrate, zinc plating layer by chromic acid passivation after the formation of white, colour, military green, etc., beautiful and generous with a certain degree of decorativeness, due to the zinc plating layer has a good ductility, so it can be cold punched, rolled, bent and other kinds of molding and do not damage the The galvanised layer has good ductility, so it can be cold punched, rolled and bent without damaging.
3,Application scope
Zinc plating involves more and more extensive areas, fasteners have been used throughout the machinery manufacturing, production of galvanised hooked wire mesh, electronics, precision instruments, chemical industry, transportation, aerospace, etc. in the national economy is of great significance.

Has a thick dense pure zinc layer covering the surface of steel fasteners, it can avoid the steel substrate and any corrosive solution contact, protect the steel fastener substrate from corrosion. In the general atmosphere, the surface of the zinc layer forms a very thin and dense zinc oxide layer surface. It is very difficult to dissolve in water, so the steel fastener substrate plays a certain protective role. If zinc oxide and other components of the atmosphere to generate insoluble zinc salt, the anti-corrosion effect is more ideal; with zinc - iron alloy layer, combined with dense, in the marine salt spray atmosphere and industrial atmosphere in the performance of the unique corrosion resistance; due to the combination of solid, zinc - iron mutual solubility, with a strong wear resistance; due to the zinc has good ductility, the alloy layer and the steel substrate adhesion. Because of the good ductility of zinc, the alloy layer is firmly attached to the steel substrate, so hot-dip galvanising can be used for cold punching, rolling, drawing, bending and other moulding processes without damaging the plating layer; hot-dip galvanising of steel structural parts is equivalent to an annealing process, which can effectively improve the mechanical properties of the steel substrate, eliminate the stresses of the steel parts moulding and welding, which is conducive to the steel structural parts for turning; the surface of the hot-dip galvanising of the fasteners is bright and beautiful; pure zinc is the most plastic layer of the hot-dip galvanising. The pure zinc layer is the most plastic layer of zinc, its nature is basically close to pure zinc, with good ductility.

 
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