The role of washers in the way fasteners are bolted together industry solutions

Among the fastener connection methods, the bolt connection method is the most basic and practical, together with the nut and screw connection methods. Although the bolt connection is relatively simple in terms of structure, it can realize the fastening effect is very significant. In the practical application process, we will often use washers and bolts to support the use and further delay the loosening of the bolt connection after a long period of work. So, what role does the washer play in strengthening the anti-loosening effect of the bolt connection? The following content from the flat washers and spring washers and other aspects of this answer.

1. Flat washers to strengthen the role of the bolt connection

(1) The surface of the flat washer series products is relatively smooth, and the surface of the bolt head and nut is rather rough; one role of installing flat washers is to separate the connecting parts from the bolts, which prevents the connection from being scratched.

(2) Reduce the bolt's pressure on the connection's surface. In the bolt connection mode, twisting the bolt head and nut will produce a certain pressure on the surface of the connector; if the surface of the connector's pressure resistance is weak, it is easy to break. At this time, the selection of flat washers to make the connection of the pressure to withstand the area increased significantly; the corresponding pressure on the surface of the connecting parts has been reduced considerably and will not affect the fastening effect of the bolt connection itself.

(3) In some particular working scenarios, the bolt holes between the two connectors must correspond precisely, which requires different-sized holes to compensate for each other and adjust the deviation. When the bolt hole exceeds the limit, flat washers must be equipped to ensure the successful connection of the bolt.

(4) The length of the bolt hole is not set in stone. Sometimes, to facilitate the installation and adjustment of the size of the bolt hole, we will choose to play the bolt hole longer. You must use flat washers to assist in the formation of the bolt connection, and even the need to buy customized thickened flat washers or multiple flat washers stacked use.

2. Spring washers strengthen the role of the bolt connection

(1) Spring washers are mainly used for the bolt connection stress relaxation of stress in time to supplement, especially when the clamping length of the elected bolts is shorter; it is necessary to use spring washers to assist.

(2) Spring washers are suitable for the bolt itself, which is not high in mechanical strength and can supplement the bolt stress. But if the choice of high-strength bolts for fastening connections is not suitable for the use of spring washers, if forced to use them, they will weaken the anti-loosening effect of the opposite effect.

3. Bolt connection without washers

Have you probably understood that flat washers and spring washers in the bolt connection play a specific role? In what cases is it not required to use washer products?

(1) The shear stress bolt connection is unique; this fastener connection mode of the bolt itself does not need to give too much preload. Complete the connection after the bolt will not be affected by the axial force. The shear stress bolt to adapt to the bolt hole is relatively small; the pressure on the surface of the connection is also relatively small, so this bolt connection can not use the washer.

(2) When using flange-type nuts or flange-type bolts, the flange-type structure itself increases the area under pressure, so there is no need to use additional washers.

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