Flange bolt - general view
Like a simple hexagon head bolt, it is a rod with a metric thread, at one end of which is a head with keyed edges. However, there is added a flange to the head, which simplifies the process of twisting the details of the mechanism. The flange acts as a washer, while there are flanges with a smooth clamping surface and a toothed flange.
Thanks to the smooth surface of the flange, the unit is quite tight, and under the head of the bolt does not get under the head of the bolt, even in a liquid state. A serrated surface ensures that the bolt will sit tightly in the casing, since the toothed part will additionally fix the bolt in the casing.
The flange increases the contact area of the head with the surface of the part, which increases the level of connection reliability. It turns out that the load is distributed over a large area and the bolt can withstand more significant loads. As a result, the connection with such a bolt, unlike a standard bolt, is more reliable and durable.
To the note. It is possible to deduce at once one main feature of a bolt with a flange. Thanks to the flange, the bolt has a low probability of arbitrary unscrewing from the knot!
Scope of flange bolt
Flange bolts have a wide range of applications. These are machine building, furniture industry, oil refining and other branches of modern industry. As a rule, bolts with a flange are made with high strength values, from 8.8 and more. Therefore, it is convenient to use them in machine building, in responsible nodes, which must keep long monotonous loads.
It is convenient to use a bolt with a flange in those connections where reliable coupling of two or more parts is necessary, and for this simple reason it is used in different industries in large volumes. For example, in the units of power units often use this type of bolt, because even with a strong vibration, the bolt will hold the part tight. The flange, the increased area of the bolt cap connection, allows you to hold on tight enough to the surface to which the bolt cap is pressed.
GOST and testing
Flange bolts are marked with DIN letters according to German standards. German standards in many respects differ from Russian GOSTs, but on application it is reflected a little than. According to GOST, bolts are made of carbon steel, then they are processed, and after that several samples from the batch go to the test.
The test is that the bolt must withstand the load in the screwed state, while not letting it deform. The party is sent to the counters only if the test is passed successfully and the bolt is not deformed.
Purchasing a bolt with a flange
Selecting bolts with a flange is necessary from the conditions of use. First of all, the size and thread are chosen. After you choose a strength class( you can learn about the strength classes from the article "What is a bolt").It is necessary to choose stronger bolts, with high performance, if the budget allows. The higher the strength class of the bolt, the longer it will last in the joint.
Please note when purchasing for lack of rust and thread integrity. The presence of carving or minor rust can indicate the sale of lots of bolts that have not passed the fitness tests. Try to avoid such points of sales of hardware products.
Before going to the counter, the flange bolt goes through the surface treatment of the metal, so the finished product must be free of defects and look aesthetically pleasing.
