The M4 Allen Bolt 20mm Black Grade 12.9 Alloy Steel Hex Socket Head Cap Screw is a high‑strength, precision fastener designed for demanding mechanical and industrial applications. Ideal for tight spaces, machinery assemblies, robotics, electronics enclosures, and equipment requiring reliable clamping, this bolt combines strength, durability, and a sleek, professional finish.

Specifications:

• Thread Size: M4 (metric)
• Length: 20mm
• Strength Grade: 12.9 (high-tensile alloy steel)
• Material: Quenched and tempered alloy steel
• Head Type: Hex socket (Allen head)
• Drive Type: Internal hex — compatible with Allen/hex keys
• Thread Type: Metric coarse
• Finish: Black oxide coating for corrosion resistance and low‑profile appearance

Features:

• High tensile strength: 12.9 grade provides exceptional clamping force and resistance to shear, ideal for heavy-duty or vibration-prone applications.
• Compact, space-saving design: Hex socket head allows installation in tight or recessed areas where standard bolts cannot fit.
• Durable construction: Heat-treated alloy steel ensures long-lasting performance and resistance to wear and mechanical stress.
• Professional appearance: Black finish offers a clean, low-profile look suitable for visible assemblies and machinery.
• Easy installation and maintenance: Internal hex design allows secure tightening and easy removal using standard hex keys.

Typical Use Cases:

• Machinery and robotics assemblies requiring high-strength, compact fasteners.
• CNC machines, 3D printers, and other precision equipment.
• Electronics enclosures, metal frames, and housings needing a flush and durable fastener.
• DIY, mechanical, or industrial projects where reliability and strength are essential