In theory split washers (aka lock washers or helical spring washers) are supposed to work by squishing flat between the nut and the mounting surface when you tighten them. At this point the sharp edges of the washer are supposed to dig into the nut and mounting surface to prevent counter-clockwise rotation.Click to see full answer. Similarly one may ask, what goes first spring washer or flat washer?Ideally the lock washer goes into the threaded fastener first followed by the flat washer. The flat washer can be used on the bolt side, nut side or both. If the assembly calls for other types of washers or hardware elements besides these two, they should go on before the lock washer.Also Know, when should you use a flat washer? 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. Simply so, where can you use a spring washer? Spring washers, which have axial flexibility and are used to prevent fastening or loosening due to vibrations. Locking washers, which prevent fastening or loosening by preventing unscrewing rotation of the fastening device; locking washers are usually also spring washers.Which way does the flat side of a washer go?The side with the sharper edges goes towards the surface to be clamped. The rounded side goes towards the nut or bolt. If a split lock washer is also used it goes between the nut/bolt and the flat washer.

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