40 pcs) M8-1.25, DIN 1587, Metric, Acorn Cap Dome Nuts, A4 Stainless Steel: Amazon.com: Industrial & Scientific
600pcs) DIN 1587 M8 Hexagon Domed Cap Nuts, High Type A2 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP158728: Amazon.com: Industrial & Scientific