6000 pcs) M6-1.0, DIN 6923, Metric, Hex Flange Nuts, Class 10 Steel, Yellow Zinc Plated and Baked: Amazon.com: Industrial & Scientific
400pcs) DIN 6923 M6 Hexagon Flange Nuts Without Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP6923406: Amazon.com: Industrial & Scientific
Amazon.com: 10 M14-2.0 Hexagon Flange Nut - with Serrations Class 8 Zinc. DIN 6923 : Industrial & Scientific