Drill bit GRAPHITE cobalt for metal, cylindrical shank 6.5 mm (57H040)

GRAPHITE cobalt drill bit for metal with a cylindrical shank and 6.5 mm diameter is designed for precision drilling in hard and tough materials. Made from high-cobalt alloy, the bit offers improved heat resistance and enhanced wear performance compared to standard high-speed steel bits. Its 6.5 mm diameter and straight shank make it compatible with standard chucks in hand drills and drill presses used in metal fabrication, maintenance and repair tasks.

Advantages

The high-cobalt composition increases hardness at elevated temperatures, reducing edge wear during prolonged drilling in stainless steel and hard alloys. The geometry and cutting angle are optimized for efficient chip evacuation and stable penetration in metal workpieces. The cylindrical shank ensures secure clamping in standard drill chucks, while the 6.5 mm diameter provides a common size for through-holes, pilot holes, and component assembly.

Suitable for

• Drilling stainless steel and other corrosion-resistant alloys
• Fabrication and assembly of metal components
• Maintenance and repair work in workshops and industrial settings
• Use with hand drills and drill presses for metalworking

Key specifications

• Material: cobalt alloy (high-cobalt drill steel)
• Tip diameter: 6.5 mm
• Shank type: cylindrical (straight) shank
• Intended use: drilling metal, including stainless steel and hard alloys
• Compatibility: suitable for standard drill chucks and drill presses

How to use

Clamp the drill bit securely in the drill chuck, ensuring the straight shank is fully seated. Use appropriate cutting speed and feed rate for the workpiece material; reduce speed for stainless steel and hard alloys to minimise heat buildup. Apply cutting fluid or coolant during drilling to extend tool life and improve chip removal. Start drilling with firm, steady pressure and avoid excessive force that could cause bit breakage or workpiece damage. Retract periodically for deep holes to clear chips and allow cooling.

Usage recommendations

For best results when drilling stainless steel or hard alloys, use a low to moderate spindle speed, steady feed, and a suitable cutting fluid. Inspect the bit for wear before use and replace when edges show significant rounding or chipping to maintain hole quality and safety.