Bolt flange - the key to a reliable connection

bolt flange - general view

As a simple hex bolt, it is a rod with metric thread, one end of which is located under the head with the faces of the key.However, there is added to the head flange, which simplifies the process of twisting the parts of the mechanism.The flange acts as a washer, wherein there are clamping flanges with a smooth and toothed surface.

Thanks to the smooth surface of the flange, the assembly becomes quite tight, and under the bolt head with a tight connection with a smooth body gets nothing, even in the liquid state.A serrated surface ensures that the screw will sit firmly in the housing as part of the gear will additionally secure the bolt in the housing.

flange increases the area of ​​contact with the head surface of the component that increases the level of reliability of the connection.It turns out that the load is distributed over a larger area and a bolt can withstand a significant load.As a result, such a screw connection, in contrast to the standard bolt a more reliable and durable.

Note.You can display just one main feature of the bolt flange.Thanks to the flange bolt has a low probability of any loosening of the assembly!

Scope bolt flange

flange bolts have a wide range of applications.This machinery, and furniture industries, and refining and other branches of modern industry.Typically, the flange bolts are made with high strength, of 8.8 or more.Therefore, it is convenient to use in mechanical engineering, in critical nodes, which should keep long monotonous load.

convenient to use a bolt with the flange in those compounds where a rugged coupling of two or more parts, and for this simple reason that in different branches of industry it is used in large volumes.For example, the nodes of power units often use this type of bolt, because even in high vibration bolt is hard to keep the item.Flange, increased bond area of ​​the cap bolt, makes it quite hard to hold on to the surface to which the cap is pressed against the bolt.

GOST and testing

flange bolts marked letters on German DIN standards.German standards differ in many ways from the Russian guests, but this is reflected in the application of little.According to GOST bolts are made of carbon steel, then they are processed, and then a few samples from the party go for a test.

test is that the bolt must withstand the load in screwed state, without giving themselves deform.Part is sent to the counters only if the test is passed and the bolt has not undergone deformation.

Purchase bolt flange

Choose bolts with the flange of the necessary conditions of use.The first selected thread and size.Once chosen strength class (on the strength classes can be found in the article "What is a bolt").You must choose a stronger bolts with high, if the budget allows.The higher the class of bolt strength, the longer it will last in the compound.

Pay attention when buying the absence of traces of rust and the integrity of the thread.Availability marriage thread or small rust manifestations may indicate a sales party bolts that have not passed fitness tests.Try to get round such points of sales of hardware products.

Before going on the counter bolt flange extends metal surface treatment step, so the finished product must be free of defects and to look aesthetically pleasing.