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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.
Traditional Top-load Washer. 1  Top-loading washers were the only choice for a long time and tend to be the least expensive option. They're a little tougher on clothes because of the central agitator that spins your clothes. 2  A high-efficiency top-load washer combines the best of top-load and front-load models.