M4 Hex Nut – 304 Stainless Steel | Metric M4 Nut for 3D Printers, CNC, Robotics, and Frame Assembly

Description ✅ Metric M4 thread – 4mm diameter✅ 304 stainless steel – corrosion-resistant & strong✅ Compatible with 2020/2040 aluminum extrusions✅ Ideal for 3D printers, CNC machines, and DIY robotics✅ Precision threads ensure tight, reliable fastening