What is the difference between a non-serrated lock washer and an outer serrated lock washer?

The serrated lock washer is used in conjunction with the nut to be installed on the bolt. Its function is similar to the spring washer, which can lock and prevent loosening. Serrated lock washers are divided into inner serrated lock washers and outer serrated lock washers. Although they belong to the same lock washers, there are still quite big differences. Let's look at this article for your introduction.
How to prevent loosening of internal serrated lock washers?
The serrated lock washer is a single ring washer, and the opening is misplaced. When the nut is tightened with a wrench, the tines of the wrong opening will be inlaid on the surface of the component to prevent the nut from loosening . The internal tooth lock washer has a backward pushing force after being tightened, so as to achieve the purpose of preventing loosening.
The difference between internal serrated lock washers and external serrated lock washers
①, the difference in appearance
Although the names of these two washers are similar, their appearance is quite different. Internal serrated lock washers, as the name suggests, have serrations on the inside of the washer, while external serrated lock washers have serrations on the outside of the washer. (Guide: a familiar story about bolts and threads)
External tooth lock washer
②, the difference in function
Internal tooth lock washers are used under screw heads with smaller head sizes. Inner tooth lock washers are mostly used in mechanical assembly to fasten anti-vibration sealing parts, which is a stable fastening.
External tooth lock washers are used in places where couplings are easy to loosen to prevent loosening or displacement of couplings. They are mostly used under bolt heads and nuts.
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