M12 M20 Carbon steel Hexagon Nuts Grade8.8 Black finishing Metal Nuts Class 8.8

M12 M20 Carbon steel Hexagon Nuts Grade8.8 Black finishing Metal Nuts Class 8.8
 
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

How to match the grade of bolts and nuts? If the bolt is grade 8.8, what grade should the nut be?

Metric bolt grade: 4.6; 4.8; 5.8; 6.8; 8.8; 9.8; 10.9; 12.9.

Metric nut grade: 4; 5; 6; 8; 10; 12 where 4; 5 is the strength level of thin nuts.

So: bolts with 8.8 grade, nuts with 4 grade, this makes sense?

First of all: 8.8 and 4 level is too unscientific.

General selection of bolts to remove the grade behind the decimal is the grade of the nut, 8.8 grade bolts with 8 grade nuts, 10.9 grade bolts with

10 grade nuts.

That is, the bolt, nut strength level is the same (bolt 8.8 and nut 8 strength level is the same, because the bolt after the ‘.8’ that is the yield strength is 80% of the tensile strength.)

But consider the use of the situation if the nut is not easy to replace, the bolt is easier to replace, can also be changed to bolt 4.8 nut 5.

There are occasions when the strength of nuts is a little lower than that of bolts, mainly because the failure of bolts is usually not easy to detect, sometimes suddenly, whereas the failure of nuts is easier to detect. The safety aspect is also taken into account. This ensures that when used in conjunction, the life of the screw is longer than the nut, and so that when removing and replacing fasteners, the cost will be cheaper and easier.

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.

 
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