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Stainless Lock (split) and Flat Washers
Lock washers are surprisingly effective at stopping screws from vibrating loose.
Buying tip: The washer size should match the first number in the screw size. As an example, a #4 washer will fit a 4-40 Socket Head and a #4 Sheet Metal Screw, etc.
After entering the number of packages that you want for each item, simply click the "Add To Basket" button at bottom of the page.