M4*40 12.9 grade semi-round head internal hexagonal screw

Button Head Hex Socket Screw M4×40, Grade 12.9

Looking for strong, reliable fasteners for your DIY, workshop, or hobby builds? This M4×40 button head screw with internal hex socket is a great choice whenever you need a compact head shape, solid grip, and high mechanical strength. Made from grade 12.9 steel, it is well suited for demanding assemblies where durability matters.

• Thread size: M4
• Length: 40 mm
• Head type: Button head
• Drive type: Internal hex socket (Allen)
• Material grade: Steel, grade 12.9
• Thread diameter: 4 mm
• Pack quantity: 50 pcs

The low-profile button head gives your project a clean, neat finish, while the hex socket drive makes installation easy with a standard Allen key. These screws are a practical pick for model making, electronics enclosures, 3D printer assemblies, RC projects, robotics, and many other hobby applications.

Package includes:

• 50 × M4×40 button head hex socket screws