High-strength Bolts are mostly used for the connection of bridges, rails, high-pressure and ultra-high-pressure equipment. The breakage of such bolts is mostly brittle fracture. High-strength bolts used in ultra-high-pressure equipment need to be applied to ensure the sealing of the container. Prestressed 0310-6898512 manufacturers.
Several concepts about high-strength bolts 1. According to the specified performance level of bolts above 8.8, it is called high-strength bolts. The current national standard is only listed to M39. For large-size specifications, especially the length is more than 10~15 times. The high-strength bolts are still short-lived in domestic production.
Bolt classification Yongnian 0310-6898512 Xiongjie fastener company detailed:
1. According to the way of connection, there are common and reamed holes. The bolts for reaming holes should match the size of the holes and be used when subjected to lateral forces.
2, according to the shape of the head, there are hexagonal heads, round heads, square heads, countersunk heads, etc. The general countersunk head is used in places where the surface is required to be smooth and not protruding, because the countersunk head can be screwed into the part. The head can also be screwed into the part. The tightening force of the square head can be larger, but the size is very large. Hex head is the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head, and the rod has holes, which can make the bolt not loose when it is vibrated.
Some bolts with unthreaded rods are to be thin, called thin waist bolts. These bolts are beneficial for the coupling of variable forces.
There are special high-strength bolts on the steel structure. The head will be bigger and the size will change.
In addition, there are special uses: T-slot bolts, the most used on machine tool fixtures, special shape, cut off on both sides of the head. Anchor bolts for machine and ground connection, there are many shapes. U shape Bolts, as mentioned above.
There is also a special stud for welding. There is no thread at one end, it can be welded on the part, and the nut can be directly screwed on the other side.
The latest analysis of bolt basics:
Bolts, mechanical parts, cylindrical threaded fasteners with nuts.
The most detailed introduction of the bolts 0310-6898512 analysis:
A type of fastener consisting of a head and a screw (a cylinder with an external thread) is required to be fitted with a nut for fastening the two parts with through holes. This type of connection is called a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. Because bolts are also a type of railroad accessory, railroad fittings are part of the railroad line, and the rails referred to here include rails, sleepers, joint parts, track beds, anti-climbing equipment, rail stays, and ballasts. As a holistic engineering structure, the track is laid on the roadbed and plays a guiding role in train operation, directly bearing the tremendous pressure of the rolling stock and its load. Under the power of train operation, its various components must have sufficient strength and stability to ensure that the train runs safely, smoothly and without interruption according to the specified maximum speed.
The most complete analysis of the bolt grade:
Bolts - Performance Grades Bolts for steel structure connection are rated at 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., of which 8.8 and above are made of low carbon alloy steel or medium carbon. Steel is heat treated (quenched, tempered), commonly known as high-strength bolts, and the rest is commonly referred to as ordinary bolts. The bolt performance grade label is composed of two parts, which represent the nominal tensile strength value and the yield ratio of the bolt material. For example: Bolts with a performance class of 4.6, the meanings are: 1. The nominal tensile strength of the bolt material is 400MPa; 2. The yield ratio of the bolt material is 0.6; 3. The nominal yield strength of the bolt material is 400×0.6=240MPa. Grade performance grade 10.9 high-strength bolts, the material can be achieved after heat treatment: 1. The nominal tensile strength of bolt material is 1000MPa; 2. The yield ratio of bolt material is 0.9; 3. The nominal yield strength of bolt material is up to The meaning of 1000×0.9=900MPa class bolt performance grade is the international standard. The bolts of the same performance grade have the same performance regardless of the difference between the material and the place of origin. Only the performance grade can be selected in the design. Strength grades The so-called 8.8 and 10.9 grades refer to the bolt's shear stress rating of 8.8GPa and 10.9GPa. 8.8 Nominal tensile strength 800N/MM2 Nominal yield strength 640N/MM2 The general bolt is expressed by "XY", X *100=The tensile strength of this bolt, X*100*(Y/10)=the yield strength of this bolt (because it is specified by the marking: yield strength/tensile strength=Y/10) The tensile strength is: 400 MPa The yield strength is: 400*8/10=320 MPa.
Bolts should be used when installing the most precautions that should be noted when installing 0310-6898512:
1 Each time the 12000km operation is carried out for secondary maintenance, the engine oil sump should be disassembled to check the use of the engine bearing bush. If the individual bearing bush clearance is too large, it should be replaced, and the connecting rod bolt should also be replaced at the same time. If you find that the engine is running unevenly and there is abnormal noise during normal operation, you should stop it for inspection. 2 In each maintenance, the newly replaced connecting rod bolts should be inspected. It should be noted whether the head, the guiding part and the thread parts of the bolt have cracks or dents. Whether the shape and pitch of the thread are abnormal, there should be no need to use abnormal conditions. 3 When assembling the connecting rod cover, apply a torque wrench and tighten according to the specified standard to prevent the torque from being too large or too small. 4 Select the connecting rod bolts produced by the supporting factory.
HCH Hardware is a bolt manufacturer and provides all kindsof fasteners since 2008. Our main products includestandard bolts, nuts, Screws, washers, Pins and OEM parts. We have integrated resources from more than 50 top level fastener factories in Jiaxing, Haiyan, Ningbo,Dainan, Qintongareas, and have established long term relationships with them.We arenow serving for over 60 customers in South and North America.We can provide you with one stop services to meet you different needs, which can save your purchasing cost and optimize your efficiency. HCH Hardware was certified by ISO9001-2015 on 02/25/2021.We especially emphasize on products quality,HCH Hardware have necessary conditions for quality control with applicable processes and experienced experts. Appropriate production processes and quality control
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