M4 Screw Kit With Hex Socket Head Bolts Nuts And Washers, 320 Pcs, M4x25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 12.9 Grade Alloy Steel Black Oxide, Six Lengths, Burr Free Threads, 0.01mm Tolerance, Pro Grade For 3D Printers And DIY Repairs

Premium M4 Screw Kit with 320-Piece Black Oxide Fasteners
✔️ Six M4 lengths (25/30/35/40/45/50 mm) with burr-free threads

This precision metric M4 fastener kit contains six screw lengths plus nuts and washers in a sturdy storage case. It is ideal for assembling and repairing 3D printers, CNC machines, RC models, electronics, furniture, bikes, and automotive projects in workshops or home setups.

✅ 12.9 grade alloy steel with black oxide finish delivers strong, rust-resistant bolts
✅ Six M4 lengths: 25, 30, 35, 40, 45, 50 mm
✅ Includes nuts and washers for a complete fastening set
✅ Burr-free threads with 0.01 mm tolerance for smooth, reliable threading

💡 What is an M4 screw kit used for in 3D printing, CNC machines, RC models, and electronics?

Handy, reliable fastening solution for common builds and repairs.

- Broad use across printers, robotics, RC models, electronics
- Six lengths (25-50 mm) plus nuts and washers
- 12.9 grade alloy steel with black oxide for strength and rust resistance
- Stored neatly in a labeled case for quick access✝️