Drill Bit MILWAUKEE WIERTŁO HSS-G CO 5.0 mm – high-speed steel cobalt tip

HSS-G CO 5.0 mm drill bit from MILWAUKEE is a high-speed steel twist drill with added cobalt for enhanced heat resistance and wear performance. Designed for metalworking tasks, this 5.0 mm diameter bit produces precise round holes in steel and other hard metals. It is compatible with standard chucks on both hand-held drills and bench or pillar drilling machines, making it suitable for repair, assembly and fabrication operations where consistent hole quality is required.

Advantages

The cobalt alloyed HSS construction increases red hardness and maintains cutting edge integrity at elevated temperatures, reducing premature wear during prolonged drilling in tough materials. The ground flute geometry offers efficient chip evacuation and stable penetration, while the 5.0 mm diameter provides repeatable results for clearance and pilot holes. The bit’s construction supports reliable performance in both intermittent and continuous drilling applications.

Suitable for (tasks / use cases)

• Drilling through mild and alloy steels
• Creating pilot and clearance holes for assembly and fabrication
• Repair and maintenance work on metal components
• Use with hand drills, drill presses and portable machinery

Key specifications

• Material: high-speed steel with cobalt alloying
• Type: HSS-G (ground twist drill)
• Diameter: 5.0 mm
• Tip: ground cutting point optimized for metal drilling
• Shank: cylindrical, suitable for standard chucks
• Typical applications: steel and other hard metals

How to use

Secure the drill bit in the drill chuck ensuring proper centring and firm clamping. Select an appropriate drilling speed for the material—lower speeds for hardened steels and higher speeds for softer metals—while applying steady, moderate feed pressure. Use cutting fluid or lubricant when drilling metals to reduce heat buildup and improve chip evacuation. Withdraw the bit periodically for chip clearing on deeper holes and allow the bit to cool if it becomes excessively hot.

Usage recommendations

For optimal tool life and hole quality, pre-drill with a smaller pilot when required, apply cutting fluid for continuous metal drilling, and match drilling speed to the workpiece material. Replace the bit if wear or chipping compromises hole accuracy.