M4 M16 Carbon steel Galvanised Hexagon Nuts Class 4.8 Grade 8.8 Zinc plating Metal bolts

M4 M16 Carbon steel Galvanised Hexagon Nuts Class 4.8 Grade 8.8 Zinc plating Metal bolts
 
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

1, ordinary hexagon - more widely used, characterized by the fastening force is relatively large, the disadvantage is that in the installation to have enough operating space to, installation can be used with a live spanner or open-ended spanner, or spectacle spanner above the wrench requires a lot of operating space.

2, cylindrical head hexagon - is the most widely used of all screws, because he fastening force is relatively large, the use of hexagonal wrenches can be operated, the installation is very convenient, almost used in a variety of structures, the appearance of a more beautiful and neat, the disadvantage is that the tightening force tip is lower than the outer hexagonal, in addition to repeated use of the easy to damage the hexagonal caused by the inability to dismantle.

3, disc head hexagon - mechanical rarely used, mechanical properties as above, mostly used in furniture, the main role is to increase the contact surface with wooden materials and increase the appearance of the ornamental.

4, headless hexagonal - some structures must be used, such as the need for great tightening force of the top wire structure, or the need to hide the cylindrical head of the place.

5, countersunk head hexagon - mostly used in power machinery, the main role of the same hexagonal

6, nylon lock nut - inlaid nylon rubber ring in the hexagonal surface, to prevent thread loosening of the structure, strong power machinery.

7, flange nut - mainly play a role in increasing the contact surface with the workpiece, mostly used in pipelines, fasteners have been some stamping and casting parts.

8, ordinary hexagonal nuts - the most widely used, but also one of the most common fasteners.

Zinc is soluble in acids as well as in bases, so it is called an amphoteric metal. Zinc undergoes little change in dry air. In humid air, a dense film of zinc alkali carbonate is formed on the surface of zinc. In containing sulfur dioxide, hydrogen sulfide and marine atmosphere, zinc corrosion resistance is poor, especially in the high temperature and high humidity containing organic acid atmosphere, zinc coating is very easy to be corroded. The standard electrode potential of zinc is -0.76V, for the steel substrate, zinc plating belongs to the anodic plating, which is mainly used to prevent corrosion of steel, the advantages and disadvantages of its protective properties and the thickness of the plating is very large. Zinc coating can significantly improve its protective and decorative properties after passivation treatment, dyeing or coating with gloss protection agent.

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 zinc plating.
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.

 
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