1000pcs) DIN 6923 M4 Hexagon Flange Nuts with Serration A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP692344: Amazon.com: Industrial & Scientific
M5 x 0.80 Coarse Thread DIN 6923 / ISO 4161 Class 8 Hex Flange Nut Medium Carbon Steel Zinc Plated Pk 100: Amazon.com: Industrial & Scientific
(6000 pcs) M6-1.0, DIN 6923, Metric, Hex Flange Nuts, Class 8 Steel, Zinc Plated: Amazon.com: Industrial & Scientific