Bosch HSS-Co 25-Piece Cobalt Drill Bit Set, 1mm-13mm, DIN 338

Bosch 25-Piece Cobalt Set

The Bosch Cobalt Drill Bit Set delivers industrial-grade performance when boring through high-tensile and abrasive metals. Engineered from M35 grade high-speed steel with a 5% cobalt alloy, these bits maintain structural integrity under extreme thermal loads. This comprehensive kit provides a full range of diameters from 1mm to 13mm in 0.5mm increments to support precision metalwork on any job site.

Built for the Job

Fabricators and site engineers frequently encounter hardened materials that burn out standard HSS bits. These cobalt-alloyed components are specifically designed for drilling into stainless steel (V2A and V4A), acid-resistant steel, and cast iron. The high heat resistance allows for higher cutting speeds and feed rates compared to standard carbon steel alternatives. Whether installing structural brackets or repairing heavy machinery, this set ensures consistent hole accuracy without frequent bit changes. The cylindrical shank design makes these accessories compatible with standard 13mm keyed or keyless chucks found on most professional-grade corded and cordless drills.

• Boring into stainless steel sheeting and structural sections.

• Drilling high-alloy steels and heat-treated metal components.

• Heavy-duty maintenance and repair in industrial environments.

Product Highlights

Active Cooling Geometry

The 5% cobalt formulation provides exceptional heat resistance to prevent cutting edge blunting during dry drilling.

Self-Centering Split Point

• 135-degree split point tip eliminates the need for center punching.
• Provides immediate penetration with reduced wandering on curved surfaces.

Technical Specifications

What’s Included

• 25 x HSS-Co Cobalt Drill Bits (1.0mm to 13.0mm)

• 1 x Robust Metal Indexing Storage Case

On-Site & Workshop Notes

• Always apply steady pressure and use a lower RPM for larger diameter bits in this kit to maximize service life.

• While these cobalt units handle heat exceptionally well, using cutting fluid or oil during operation significantly extends the life of the cutting edges.

• Ensure the drill chuck is tightened securely to prevent the cylindrical shank from slipping during high-torque applications in thick plate steel.