Drill bit GEKO T03035 for metal, HSS M35 cobalt, 3.5 mm

GEKO T03035 is a 3.5 mm HSS M35 cobalt drill bit engineered for drilling metal. Made from high-speed steel with M35 cobalt alloying, this drill bit provides increased hardness and heat resistance compared with standard HSS. It is intended for use with hand drills and drill presses when accurate holes are required in steel, stainless steel and other hard metals. The 3.5 mm diameter offers a balance between precision and mechanical strength for common metalworking tasks.

Advantages

The HSS M35 cobalt construction increases wear resistance and maintains cutting performance at higher temperatures, reducing premature dulling during continuous or high-speed drilling. The geometry and finish of the flutes support efficient chip evacuation and stable cutting, improving hole quality and reducing the likelihood of workpiece damage. Compatibility with both hand-held drills and bench drills makes it versatile across workshop and site environments.

Suitable for

• Drilling holes in mild and alloy steels
• Creating holes in stainless steel and other hard metals
• Metal fabrication, maintenance and repair work
• Use with hand drills and drill presses for precision metal drilling

Key specifications

• Diameter: 3.5 mm
• Material: High-speed steel with cobalt alloying (M35)
• Intended material: Steel, stainless steel and other hard metals
• Shank type: Round shank suitable for standard drill chucks
• Typical applications: Through holes and clearance holes in metal

How to use

Secure the workpiece and select a suitable drill speed for the material being drilled—lower speeds for stainless and harder alloys, higher speeds for softer steels. Clamp the round shank in the drill chuck ensuring concentric alignment. Apply steady, moderate feed pressure to let the cutter do the work and withdraw periodically to clear chips if drilling deep holes. Use cutting fluid or coolant when drilling stainless steel or other heat-sensitive metals to extend tool life and improve surface finish.

Usage recommendations

For best results, pre-center with a punch or pilot drill when high positional accuracy is required. Keep drill speeds moderate for hard or heat-conductive metals and use appropriate cutting fluid to reduce friction and temperature. Inspect the cutting edges for wear and replace the bit when chipping or excessive rubbing occurs to avoid damage to the workpiece.