Drill bit GRAPHITE 13 mm cobalt for metal, cylindrical shank (57H066)

GRAPHITE cobalt metal drill bit, 13 mm diameter with a cylindrical shank, is designed for drilling hardened and stainless steels as well as a broad range of other metals. The cobalt alloy composition increases heat resistance and wear durability compared with standard high-speed steel bits, allowing sustained cutting at higher temperatures and under heavier loads. The cylindrical shank fits common chucks on hand drills and drill presses, making this drill bit suitable for workshop, maintenance and industrial metalworking tasks.

Advantages

The 13 mm cobalt drill bit combines enhanced hardness and thermal stability to provide longer life when machining tough, heat-generating metals. Its ground cutting edges maintain sharper geometry for consistent hole quality and reduced walking at startup. Compatibility with standard chucks and robust shank construction ensure secure clamping and reliable performance during repetitive drilling operations.

Suitable for

• Drilling hardened steel and stainless steel
• Metal fabrication and machining tasks
• Maintenance, repair and overhaul (MRO) work
• Use with hand drills and drill presses

Key specifications

• Diameter: 13 mm
• Material: cobalt alloy drill steel for enhanced heat resistance
• Shank type: cylindrical shank suitable for standard chucks
• Intended use: drilling in hardened and stainless steels and other metals
• Typical edge finish: ground cutting geometry for improved hole quality

How to use

Select appropriate clamping of the cylindrical shank in the drill chuck, ensuring the bit is seated straight and tightened securely. Use a steady feed rate and appropriate spindle speed for the material being drilled—lower speeds for hardened steels, moderate speeds for stainless steel—to reduce overheating. Apply cutting fluid or coolant when drilling stainless or hardened materials to extend tool life and improve chip evacuation. Clear chips frequently and allow the bit to cool between long drilling runs to preserve hardness and cutting performance.

Usage recommendations

For best results, match drill speed and feed to the metal and thickness being worked, keep the cutting edge sharp, and use suitable coolant when drilling stainless or heat-resistant alloys. Replace the bit when wear or chipping degrades hole quality to avoid damage to the workpiece.