M8 Mutter Sechskantmutter (Pack of 50) Hexagonal Nut Nuts Zinc Plated Alloy Steel For Threaded Screws Zertifizierter Stahl Standard DIN 934 ISO 4032 (8mm) : Amazon.de: Baumarkt
ReliaBot 100mm T8 Tr8x8 Lead Screw and Brass Nut (Acme Thread, 2mm Pitch, 4 Starts, 8mm Lead) for 3D Printer Z Axis: Amazon.com: Industrial & Scientific