In our daily life, if we look carefully at the connections on machinery and equipment – screws, we will find that many machinery and equipment are using hexagonal screws, why is this? What are the advantages of hexagonal screws for the connection of mechanical equipment? In the face of these questions, Prince Fastener  according to the specific understanding to explain the problem to everyone.

Hexagon socket head screws are rounded on the outside, the middle is concave hexagonal. Such a structure in fact, the advantages are very obvious.

1, Bearing greater load. It has six force-bearing surfaces, compared to only two sides of a word screw and cross-shaped screws more carry the screw.

Note: The material of the hexagonal bolt is generally made of stainless steel, carbon steel, alloy steel, and other styles of screws are basically no difference in material, the higher the performance level of high strength, the greater the choice of screws, be sure to select the appropriate performance level of screws strictly according to the requirements of use, the level is different, the price is not the same.

2, It can be countersunk processing. That is, the entire nut is sunk to the inside of the workpiece, which can maintain the surface of the workpiece flat and beautiful.

3, It is easy to install. Compared to the outer hexagonal screws, the hexagon is suitable for more assembly occasions, especially narrow occasions, so it is convenient when assembling and repairing, and convenient debugging.

4, It is not easy to disassemble. The tools we usually use are live wrenches, screwdrivers and dull wrenches, etc., while the disassembly of the hexagonal bolt must use a special wrench, so it is not easy for the general public to disassemble, which is also a benefit.

Just this one wrench problem? Some customers say that since the inner hexagonal bolt has the advantage of strength and is designed with countersunk holes, it is difficult to screw out in case of slipping the wire, while the outer hexagonal bolt has common tools to get it done, so why not design it in other shapes?

As you know, the outer hexagonal screws are exposed to the outside, the wrench must have a certain space to screw it, the required countersink hole is very large or protrude out. And the hexagonal needs a very small countersunk hole, do not consider the space, the hexagonal is basically a chicken. Therefore, the kind of screw application, or depends on the use of the occasion.

Hexagon socket head screws are similar to countersunk head screws, the nail head is buried in the machine, the connection strength is greater, but must use the corresponding specifications of the hexagonal wrench to install and remove the screw. Generally used in various machine tools and their accessories.

 According to the requirements of use, there are several points in the performance:
1, the nominal tensile strength of the screw material up to 400MPa level;
2, the screw material yield strength ratio of 0.6; screw material nominal yield strength of 400 × 0.6 = 240MPa grade. Performance grade 10.9 high-strength screws, the material after heat treatment, can achieve:
a, the nominal tensile strength of the screw material up to 1000MPa grade.
b, the screw material yield strength ratio of 0.9; screw material nominal yield strength of 1000 × 0.9 = 900MPa grade.

The meaning of the performance level of hexagonal screws is the international standard, the same performance level of the screw, regardless of the difference in material and origin, the performance is the same, the design can only choose the performance level.

TIPS

The grade of socket head cap screws is basically this, the different grades, the price on the market is certainly different. General high strength socket head cap screws are certainly much higher than the price of ordinary socket head cap screws. In the market generally used more or 4.8 grade, 8.8 grade, 10.9 grade, 12.9 grade these four kinds.

Warm tip: Hexagon socket head screws hit the eccentric, hit the crooked, may lead to very serious problems. For example, from the appearance of the product, the overall is not beautiful enough. There is also playing eccentric, it is easy to lead to the production tool punch easy to break. The most serious will also lead to hexagonal screws broken head and a series of problems.