Drill bit GEKO Cobalt HSS for metal 4 mm

GEKO Cobalt HSS drill bit 4 mm is a precision cutting tool designed specifically for drilling metal. Made from high-speed steel with added cobalt alloy, this 4 mm drill bit offers improved heat resistance and durability when working with stainless steel and other hard metals. It is suitable for use in hand drills and drill presses in workshop and professional environments, delivering accurate round holes and extended tool life under higher cutting temperatures.

Advantages

The cobalt-enhanced HSS composition increases hardness and hot-hardness, reducing wear during prolonged operation and allowing faster cutting speeds compared to standard HSS bits. The 4 mm diameter provides a balance between control and material removal for drilling small-diameter holes. The bit’s ground geometry ensures consistent chip evacuation and precise concentricity, which helps achieve clean hole edges and reliable repeatability in production or repair tasks.

Suitable for

• Drilling stainless steel and other hard metals
• Workshop repairs and maintenance
• Precision tasks requiring small-diameter holes
• Use in hand drills and bench/drill press equipment

Key specifications

• Material: high-speed steel (HSS) with cobalt alloy
• Diameter: 4 mm
• Intended material: metal, including stainless steel and hardened steels
• Tip/point type: ground for metal cutting (split or standard grind depending on manufacturing)
• Compatible tools: hand drills, drill presses
• Finish: precision-ground cutting edges for improved chip control

How to use

Secure the workpiece firmly in a vice or with clamps to prevent movement. Select an appropriate drilling speed for the material — slower RPMs for harder metals and higher RPMs for softer metals — and use suitable cutting fluid or coolant when drilling stainless steel to reduce heat buildup and improve chip evacuation. Center-punch the drill location if needed, then start drilling with steady pressure, allowing the bit to cut without excessive force. Periodically withdraw the bit to clear chips and reapply coolant as required. After drilling, deburr the hole edges for a clean finish.

Usage recommendations

For best performance and prolonged life of the GEKO Cobalt HSS 4 mm drill bit, use recommended cutting speeds for cobalt HSS in metalworking charts, apply cutting fluid when machining stainless or high-alloy steels, and avoid excessive feed rates that can cause bit breakage. Store bits in a dry, protected case to prevent edge damage and corrosion.