Diameter: 2.5mmBolt Length: 4mmPitch: 0.45mmMaterial: SS 304Bolt Head Style: Hex (Allen)Nut NOT includedAllen Key size used: M1.5(1.5mm)The M2.5 x 4mm Allen Button Head screw is 2.5mm in diameterand4mm long. They have a button shaped head giving a dome shaped appearance. Made from high-quality Stainless Steel 304 (SS304), these screws offer excellent resistance to corrosion and wear, ensuring long-lasting durability and reliability.It can be used in:Machinery Assembly: Button 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.Electronics: Ideal for electronics, button head screws secure components firmly in place, ensuring a stable and reliable connection.This screw has ahex-shaped indentationon its head, requiring aAllen Keyfor tightening.