Do nuts need washers?
Washers are important. They ensure that a nut is installed properly and prevent softer materials from damage by distributing the pressure over a greater surface area. Are washers necessary? Washers are not always necessary but it is common practice to use them anyway.
What does a washer do for a nut?
Washer, machine component that is used in conjunction with a screw fastener such as a bolt and nut and that usually serves either to keep the screw from loosening or to distribute the load from the nut or bolt head over a larger area. For load distribution, thin flat rings of soft steel are usual.
What goes first nut or washer?
If there is only one washer used with a nut/bolt, it usually goes on the nut side. The nut in most circumstances is more movable, and is more commonly turned to tighten the assembly. The washer helps prevent damage to the surface of the object being fastened.