M10 x 1.50 Coarse Thread DIN 6923 / ISO 4161 Class 8 Hex Flange Nut with Serration Medium Carbon Steel Zinc Plated Pk 50: Amazon.com: Industrial & Scientific
Amazon.com: 25 M10-1.5 Hexagon Flange Nut with Serrations Class 10 Zinc DIN 6923/ISO 4161 : Industrial & Scientific