What is high strength bolts ?

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2019-05-19 19:00:25

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Bolt is one of the most common metric fasteners. Its simple design allows you to combine items with different technical and operational characteristics. There are several classifications of bolt hardware, but in terms of the reliability of the most important separation according to the degree of resistance to physical loads. This property depends on functional stability and durability to the target design. Most attractive in this respect, high-strength bolts used in motor vehicles, industrial units and responsible building structures.

General information

the Use of high-strength bolts

The Foundation formed metal rod with a thread and a head, designed to capture the key of the correct size. Often use the elements with hexagon heads which are considered the most reliable. As the material is alloy carbon steel, able to withstand large structural loads. However, there are other brands of used alloys. These and other requirements to manufacture this products regulates GOST 52644. High strength bolts must conform to a specific class and reliability. For entry level items, for example, applies the marking of 8.8 for strength. This is a common type of fasteners, performed from hardened steel. In heavy loaded structures assumes the use of bolts, strength class which corresponds to the markings 10.9 and 12.9. A distinctive feature of this hardware can be called the ability not just to withstand a constant static load, and multiple cycles of Assembly and disassembly operations.

Operational characteristics

high Strength bolt

Compared to conventional fasteners high-strength products can be used not only under conditions of high mechanical loads, but under the heat and other negative influences. Paramount properties – fluidity and tensile strength. A balanced distribution of high-strength bolts through the sheathing or connection allows you to evenly distribute the load, thereby ensuring the reliability of the design. In the process of operation, the master calculates the nominal tensile strength, which is indicated in N/mm2. Minimum tensile strength will depend on the figures indicated in the marking. For example, 10h100 will result in 1000 N/mm2. Also the features of this type of fasteners include resistance to degradation by moisture, that is, protection against corrosion destruction.

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Dimensions products

Sizes of high-strength bolts

To specify parameters of the product uses a special marking-M16-48. It can have the following dimensions:

  • Length: 40-300 mm.
  • Diameter: 16-48 mm.
  • Thread Length: 6-18 mm.
  • Head Height: 8-24 mm.
  • Head Diameter: 19-53 mm.
  • Coating Thickness: 25-40 microns.

It is Important to emphasize that all of these dimensions are interrelated. That is, for example, at a certain length restricted to the thickness of the stud and the thread pitch. This is due to the fact that even the controlled tensioning of high strength bolts is not always possible to provide hardware moderate force, protecting it from disruptions and deformations.

Requirements for making connections

Mount high strength bolts

Mounting operations are performed only after a thorough analysis of the technical conditions of the target structure or operating mechanism. In particular, the choice of hardware on the dimensional characteristics of the pre-calculated coefficient of torsion, optimal mechanical properties and options auxiliary mounting hardware. Do not forget that high-strength bolts during installation to form a bunch of nuts and washers, which should correspond to the carrier core by the geometrical parameters.

In the implementation of the installation works the following operations are performed:

  • Preparation of hardware checking his condition.
  • Preparation work surfaces (cleaning, degreasing).
  • The Execution connections high-strength bolts using special tool. Allowed the use of manual keys or wrenches with optimum torque.
  • Control of the operation performed. Evaluation of reliability of the fastener, its geometrical accuracy and tensile strength.
  • Seal, sealing, and priming joints.

Scope of application high-strength bolts

This type of fastener is mainly used in heavy industry and construction. In industries such bolts used in the Assembly of vehicles, engineering units, specialized equipment, etc. with regard to the construction sector, in accordance with GOST, high strength bolts are recommended for use in buildings and structures, which take on temporary, permanent and special loads. For example, the hardware to connect the pieces of the designs that are in the processthe operation will be a seismic explosive and vibration fluctuations. On Wednesdays the use of a hard limitation. High strength alloy is successfully applied in the conditions of a temperature down to -60 °C when exposed to aggressive chemicals.

Types of high strength bolts

Conclusion

Create the optimal characteristics of the connection only when using the appropriate fasteners. Design of fasteners of increased strength, of course, improves the quality of the docking station, but it is necessary to choose the right type of thread, shape of head, size, etc. for Example, according to the same GOST, high strength bolts can have complete and incomplete thread. In the first case, the portion of the rod receives a “clean” surface, and the second – corrugated throughout its length. Therefore, the purpose of these bolts will be different. Attention should be paid and the methods of applying protective coatings. The main enemy of metal fasteners is rust and to best protect the structure from its distribution, you must initially choose products, past galvanizing or corrosion-resistant plating. This is mainly for use in the outer surfaces of the building structures and vehicles.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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