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The spring washer is installed under the nut to prevent the nut from loosening.

It is stated in national standards.

Hexagon slotted nut is specially used with the bolt with hole at the end of the screw, so as to insert the cotter pin from the groove of the nut into the hole of the screw and prevent the nut from loosening automatically. It is mainly used in occasions with vibration load or alternating load.

The methods to prevent automatic loosening of nuts (or bolts) in mechanical design and manufacturing include:

1. Padded spring washer; (easy to do)

2. Use hexagon slotted nut + cotter pin; (processing procedures increased year-on-year)

3. Pad the stop washer; (processing procedures increased year-on-year)

4. Insert the steel wire into the hexagon head opening of the hexagon bolt. (processing procedures increased year-on-year)

Spring washers are used to prevent looseness. For example, the bolts connecting the motor and the base generally need spring pads, because the motor vibrates. If there is no spring pads, the nuts will loosen. Generally, the fasteners on the equipment with vibration are equipped with spring gaskets, and the flanges generally do not need gaskets! Whether to add spring gasket to the flange is related to the medium flowing through the pipeline. If it is easy to produce pulse, it is best to add spring gasket, as well as high-speed fluid, and the caliber changes frequently Don't generalize On some valves, the gland flange of stuffing box needs to be added with spring gasket The spring gasket is fast, easy and excellent, and the automatic selection is included.