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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
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Amazon.com: 25 M10-1.5 Hexagon Flange Nut with Serrations Class 10 Zinc DIN 6923/ISO 4161 : Industrial & Scientific
500pcs) DIN 6923 M10 Hexagon Flange Nuts with Serration A2 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP6923210: Amazon.com: Industrial & Scientific