Spring washers
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M8 Hot Sale Carbon Steel Black Phosphor Bronze Top M3-M30 Spring Lock Washer
Spring washers are used to prevent loosening, flat washers have no relaxation function, that is, flat washers only increase the contact area, and spring washers can prevent loosening.
Flat pads: just increase the surface area to prevent damage to the mounted parts of the soft substrate or to block the holes.
