Drill bit GRAPHITE cobalt for metal, cylindrical shank 12 mm (57H062)

GRAPHITE cobalt drill bit with a 12 mm cylindrical shank is designed for drilling holes in steel and other hard metal alloys. Made from high-speed steel with cobalt alloying, this drill bit offers increased heat resistance and extended wear life compared with standard HSS bits. The cylindrical shank ensures secure clamping in standard drill chucks and spindles used in workshops and production environments.

Advantages

This cobalt drill bit delivers improved cutting performance and longer tool life when working with hardened steels and heat-resistant alloys. Its geometry and material composition reduce the risk of premature wear and thermal softening under high cutting temperatures. The 12 mm diameter provides a balance between rigidity and material removal rate, while the cylindrical shank simplifies mounting in common drilling equipment.

Suitable for

• Drilling through stainless steel and alloy steels
• Workshop and industrial maintenance tasks
• Preparing holes for bolts, fasteners and fittings in metal fabrication
• Repair and refurbishment operations where high durability is required

Key specifications

• Drill diameter: 12 mm
• Shank type: cylindrical shank suitable for standard chucks
• Material: high-speed steel with cobalt alloying for enhanced heat resistance
• Application: designed for drilling in steel and other hard metal alloys
• Typical use environments: workshop, industrial and maintenance settings

How to use

Select a compatible drill or drill press with a chuck that accepts a 12 mm cylindrical shank. Secure the workpiece with appropriate clamping to prevent movement. Use cutting speeds and feed rates recommended for cobalt HSS drills and the specific metal being machined; reduce speed when drilling stainless or heat-resistant alloys to limit heat buildup. Apply suitable cutting fluid or coolant to improve tool life and chip evacuation. Back the drill out occasionally to clear chips when drilling deeper holes.

Usage recommendations

For best results, match drill speed and feed to the workpiece material and use a compatible coolant. Inspect the bit for wear or damage before use and replace when cutting edges become dull to avoid poor hole quality and excessive heat.