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The spring washer is mainly used for anti-loosening, the flat washer has no relaxation function, that is, the flat washer is only to increase the contact area, the spring washer can be anti-loosening, such as the bolt connected to the motor and the frame generally needs to add the spring washer, because the motor vibrates, if there is no spring washer, the nut will be loose. Generally, the fasteners on the equipment with vibration are equipped with spring washers, and the flange is generally not required to add flat washers. Whether to add spring washers on the flange and the pipeline flow medium is related, if it is easy to produce pulses, it is best to add spring washers, and high-speed fluids, caliber changes frequently, do not generize.

On some valves, the stuffing box gland flanges need spring washers. In short, the flat washer is to increase the fastening contact area; The spring pad can be used to prevent loosening where there is vibration; Tighten PVC flanges without spring washers.

If you know that the main function of the spring washer is to prevent loosening, then what are the specific conditions of use of the spring washer?

The use conditions of spring washers are as follows: The application of spring washers can be applied to the following four standards: standard spring washers (GB93-1987), light spring washers (GB859-1987), heavy spring washers (GB7244-1987). Purpose of the spring washer: The device is under the nut to prevent the nut from loosening. It is stated in the national standard. The hexagon slotted nut is specially used with the bolt with a hole at the end of the screw to insert the cotter pin into the hole of the screw from the slot of the nut to prevent the nut from loosening automatically. It is mainly used for occasions with vibration load or alternating load.

From the design idea, the spring washer (also called the spring gasket) has a pre-tension, after being compressed, after the rebound.

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

Early to solve this problem, spring washers appeared. Due to the pretension of the spring washer, after the nut compacts the spring washer, under the action of the pretension, the triangle screw buckle in the nut and the triangle screw buckle of the bolt are tightly attached together, and under the action of friction, the nut is no longer loose.

The ordinary washer (also called round hole gasket or flat gasket or ordinary gasket) is a support under the pretension of the spring washer, which increases the compression area of the pretension force of the spring washer.