Drill bit for metal GEKO T03040 HSS M35, 4 mm diameter

GEKO T03040 is a 4 mm HSS M35 twist drill bit engineered for drilling metal. Manufactured from cobalt-alloy high-speed steel (M35), this drill bit delivers greater wear resistance and improved heat tolerance compared with standard HSS, making it suitable for drilling steels and other ferrous materials. The 4 mm diameter and standardized twist geometry provide precise centering and efficient chip evacuation when used with hand drills or drill presses in metalworking environments.

Advantages

The cobalt-alloy M35 composition increases hardness and maintains cutting performance at elevated temperatures, extending tool life during continuous or demanding drilling. The twist-flute design promotes reliable chip removal and reduces binding in through-holes. The 4 mm size offers a balance of rigidity and cutting speed for common metal fabrication and maintenance tasks.

Suitable for

• Drilling mild and alloy steels
• Metal fabrication and assembly
• Maintenance and repair work on machinery and structures
• Use with hand drills and drill presses

Key specifications

• Material: Cobalt-alloy high-speed steel (M35)
• Type: Twist drill bit
• Diameter: 4 mm
• Suitable materials: Steel and other ferrous metals
• Flute form: Two-flute spiral for chip evacuation
• Intended use: Metal drilling with hand drills and drill presses

How to use

Secure the drill bit in the chuck of a hand drill or drill press, ensuring it is centered and tightened. Mark the drilling position on the workpiece and, if needed, use a center punch to prevent wandering. Start at low speed to establish the hole, then increase speed appropriate to the workpiece material and drill diameter. Apply steady pressure and allow the bit to cut; avoid excessive force that can cause overheating. For deeper holes, retract periodically to clear chips and reduce heat buildup. Use cutting fluid or lubricant suitable for metal drilling to improve cutting efficiency and prolong tool life.

Usage recommendations

Use appropriate personal protective equipment, clamp the workpiece securely, and select drill speeds and cutting fluids based on the specific steel or ferrous material being drilled. Replace the bit when wear or chipping degrades performance.