The spring washer is used under the nut to prevent nut loosening, as described in the national standard. Hexagonal slotted nuts are designed for use with bolts with holes 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, mainly for applications with vibratory or alternating loads The The role of spring washers mainly in the mechanical design, production to prevent the nut (or bolt) automatically back loose.
Methods are:
A padded spring washer
2. With hexagonal slotted nut + cotter pin;
3. Pad resting washers;
4. Hexagon bolts are inserted into the steel wire.