Cobalt HSS Metal Drill Bit GEKO G37120 12 mm

Cobalt HSS metal drill bit GEKO G37120 12 mm is a single-piece high-speed steel drill designed for drilling into hardened steels and a wide range of metal materials. The cobalt alloy in the cutting tip increases red hardness and wear resistance, enabling longer tool life under higher temperatures and more demanding cutting conditions. The 12 mm diameter provides a balance between hole size and rigidity, suitable for standard metalworking operations with hand drills or drill presses.

Advantages

The cobalt HSS composition offers improved heat resistance compared with conventional high-speed steel, which reduces edge wear during prolonged drilling in tough metals. Single-piece construction enhances stability and concentricity, while the optimised flute geometry supports efficient chip evacuation to minimise clogging. The 12 mm diameter and robust point geometry maintain accuracy and straightness when drilling through thin and medium-thickness metal sheets and bars.

Suitable for

• Drilling hardened steel and stainless steel
• General metal fabrication and repair
• Use with hand-held drills and drill presses
• Workshops, maintenance and mechanical assembly tasks

Key specifications

• Material: high-speed steel with cobalt alloy
• Diameter: 12 mm
• Construction: solid one-piece drill bit
• Suitable for: steel, stainless steel and other ferrous metals
• Shank type: straight cylindrical shank for standard chucks
• Tip geometry: split/point geometry for improved centring and reduced walking

How to use

Secure the workpiece and select an appropriate clamping method to prevent movement during drilling. Install the drill bit into the chuck making sure it is centred and tightened. Use cutting fluid or coolant when drilling hardened steels to reduce heat and extend tool life. Start at a low speed to establish the hole, then increase speed within recommended limits for HSS cobalt drills while applying steady axial pressure. Withdraw the drill periodically to clear chips and avoid overheating.

Usage recommendations

For best results, match drill speed and feed to the material: lower speeds for harder steels and higher speeds for softer metals. Regularly apply suitable cutting fluid, ensure secure clamping, and avoid excessive lateral force to prolong drill life and maintain hole accuracy.