Everbilt's metric hex nuts are internally threaded and have a hex drive for nearly all general applications. The most commonly used nut, hex nuts are
Everbilt M12-1.50 Zinc-Plated Metric Hex Nut 840328 - The Home Depot
Metric Hex Nut - Zinc - Reliable Fasteners
M8 Hexagon Nuts (ISO 4032) - A2 Stainless Steel: : Nuts
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Finished hex nuts are the most widely used nuts and will work for most applications. They are standard thickness and can be installed with a wrench or
M10-1.0 Finished Hex Nuts, Class 8 Metric Zinc Plated Steel (10-Pack)
Hexagon nut - ISO 4032/DIN 934, SM 1291-12
Hexagon nuts, ISO 4032 - Nordic Fastening Group
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Bolt Depot - Metric JIS hex nuts, Zinc plated class 8.8 steel, 8mm
Small Parts Steel Hex Nut, Zinc Plated Finish, Class 8, JIS B1181