(1000pcs) DIN 6923 M4 Hexagon Flange Nuts with Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP692344: Amazon.com: Industrial & Scientific
Hex nuts with flange and locking teeth, pack of 10, M8 & M10, flange nuts, DIN 6923-304 stainless steel, non-slip hex nuts, stainless steel : Amazon.de: DIY & Tools