Diameter: 4mmBolt Length: 40mmPitch: 0.7mmMaterial: MS(High Tensile)Grade: 12.9Finish: Black oxideThread type: Half threadBolt Head Style: SocketAllen Key size used: M3(3mm)The M4 x 40mm Allen Socket Head screw is 4mm in diameterand40mm long. These high tensile screws (grade 12.9) are designed to withstand high levels of stress and strain, providing reliable performance in demanding applications. They are black oxidized to ensure corrosion resistance and a sleek, professional appearance.It can be used in:Machinery Assembly: Socket head screws are used to secure components in machinery, providing a stable and reliable connection.Automotive Applications: These screws are essential in automotive applications, securing components to ensure vehicle safety and performance.DIY Projects: Ideal for electronics, socket head screws secure components firmly in drones, robots and 3D printers.Socket head cap screws are designed with a hexagonal internal drive in the head, allowing them to be tightened and loosened with an Allenkey.