HEX NUT, 1/4-20 SERRATED FLANGE (ZINC) - Ohio Steel Industries The serrations are angled such that they keep the nut from rotating in the direction that would loosen the nut. The serrations help in avoiding the vibration of the nut and increase the holding power of the nut. The flange may be serrated to provide a locking action. Self-locking Flange Nuts Pack Black 304 Stainless Steel Hex Flange Nuts Serrated Lock Nut M3 M4 M5 M6 Black Oxide Flange Hex Nuts Made of 304 Stainless Steel with black coating outside which is superior to regular stainless steel and any zinc plated fasteners, provides better strength... Nut type: serrated flange hexagonal lock nut; Measuring system: Imperial. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of breaking to the part and making it less likely to loosen as a result of an uneven fastening surface. 1/4-20 Serrated Flange Nut 316 (A4) Stainless Steel - FMW Fasteners Material: Made of high quality stainless steel 18-8 (304) with black oxidized finish with high level of chemical and corrosion resistance.
