Non-Standard Washer, High Heat Washers, Spring Flat Washer

Washer, a kind of fastener in the shape of a ring, is used between the support surface of a bolt, screw or nut and the surface of a connecting part to reduce the contact surface area of the connected part, reduce the pressure per unit area and protect the surface of the connected part from damage; The spring washer can also prevent the nut from loosening.

The spring washer is mainly used to prevent looseness. The flat washer has no loosening function, that is, the flat washer only increases the contact area, and the spring washer can prevent looseness. For example, the bolts connecting the motor and the base generally need spring washers, because the motor vibrates, and if there is no spring washer, the nut will loosen. Generally, the fasteners on the equipment with vibration are equipped with spring washers, and the flanges generally do not need to add flat washers. Whether to add a spring washer to the flange is related to the medium flowing through the pipeline. If it is easy to produce pulses, it is better to add a spring washer. There is also high-speed fluid, and the caliber changes frequently. Do not generalize.

On some valves, the gland flange of the stuffing box needs to be added with spring washer. In a word, the flat washer increases the fastening contact area; The spring pad can be used in places with vibration to prevent looseness; No spring washer is required for fastening PVC flange.

If we know that the main function of the spring washer is to prevent looseness, what are the specific service conditions of the spring washer?

The service conditions of spring washer are as follows: for the application of spring washer, the following four standards can be applied: standard spring washer (GB93-1987), light spring washer, (gb859-1987) and heavy spring washer (gb7244-1987). Purpose of spring washer: it is installed under the nut to prevent the nut from loosening. It is stated in the national standards. Hexagon slotted nut is specially used with the bolt with hole at the end of the screw to insert the cotter pin from the groove of the nut into the hole of the screw to prevent the nut from loosening automatically. It is mainly used in occasions with vibration load or alternating load.

Let me give you a simple example to illustrate the application of spring washer in actual use:

This kind of bolt is a common furniture fastening hardware connector. Moreover, it is an important fastener, which is usually used to fix the legs of tables. The rigorous hardware connection is usually shown in the figure below. When used with the cross bar nut, the spring washer is used.

Because once the bolts and nuts are fastened, there is a gap between them. After a long time of use, the furniture will inevitably shake, which is likely to cause the screws to loosen.

In addition! Wood will be cold stretched and hot shrunk. The main function of spring washer is to give buffer space. In terms of the design idea, the spring washer (also known as the spring washer) has pre tension, and after being compressed, it will rebound.

In practical use, due to the characteristics of the thread, it is easy for the nut to rotate along the direction of the thread after tightening, resulting in loosening of the nut.

In order to solve this problem in the early stage, spring washers appeared. Due to the pre tension of the spring washer, after the nut compresses the spring washer, under the effect of the pre tension, the triangular buckle in the nut and one side of the triangular buckle of the bolt will be closely stuck together. Under the effect of friction, the nut will no longer be loose.

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