These black-finish button head screws with M4 thread are perfect for robotics, mechanical, and prototyping applications where both strength and a professional appearance are required. The black coating provides corrosion resistance and a sleek design, while the button head offers a larger contact surface and low-profile fastening for secure and efficient assembly. Technical Specifications: Fastener Type: Screw Drive Type: Allen (Hex) Material: Steel Head Type: Button Packaging: Bag – 100 pcs Finish: Black Coating ISO Standard: 7380-1 Thread Size: M4 Drive Size: HEX2.5 Head Height: 2.2 mm Head Diameter: 7.6 mm