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Flat washers may be used on either the bolt side, the nut side or both sides of the fastener. Flat washers help to distribute the force of tightening the nut by increasing the surface area. They may also be useful as spacers when a bolt may be a bit too long for the job. Lock washers are typically used on the nut side of the fastener. The most common type of lock washer is the split coil washer.
The Friction Washer is made of a cylindrical trough with an inclined fast running paddle screw to dewater and clean ground material. The screw is fixed in the housing by means of 2 bearings and enclosed by a stainless steel screen. The ground material and water are fed from above at the lower end of the trough.