Paulin 5/16-inch Internal Tooth Lock Washers - 410 Stainless Steel

Internal Tooth Lock Washers bite into the screw head while the smooth, outside rim won't snag objects. Provide greater vibration resistance than split lock washers. Used with fasteners that have small heads.A preferred type of washer when the washer teeth must remain hidden for a finished appearance. Made from 410 stainless steel, these washers have excellent wear resistance. Use stainless steel where corrorsion is and rust is of concern or in exterior applications.