https://demonstrations.wolfram.com/WaveSpringWasher/
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One way to secure a bolt and nut joint is to put a wave spring washer under the nut. The nut compresses the washer, whose spring force increases the friction between the threads of the nut and the bolt, reducing the chance of a loose joint.
Contributed by: Sandor Kabai
website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.