Bosch HSS-AlTiN Step Drill Bit

The Bosch HSS-AlTiN Step Drill Bit is engineered to deliver smooth, burr-free drilling across multiple diameters using a single drill bit — removing the need to swap bits mid-job. Ideal for deburring, drilling round holes, and enlarging existing ones, it eliminates the need for pre-punching thanks to its precision split-point tip that ensures a clean, easy start every time.

Constructed from HSS (high-speed steel) and finished with an AlTiN (Aluminium Titan Nitride) coating, this step drill bit offers maximum service life without requiring coolant. The CNC ground spiral flute optimises chip removal and reduces vibration, while axial and radial relief grinding guarantees the highest levels of cutting smoothness. Laser-marked diameter figures on both spiral flutes provide clear, durable hole-size identification at a glance. Available in a range of sizes from 4mm–12mm up to 6mm–40.5mm to suit various applications.

Features and Benefits:
• Smooth, burr-free drilling across multiple diameters with a single bit
• Split-point tip for easy starts — no pre-punching required
• CNC ground spiral flute for optimised chip removal and reduced vibration
• Axial and radial relief grinding for the highest cutting smoothness
• HSS construction with AlTiN coating for maximum service life without coolant
• Laser-marked diameter figures on both spiral flutes for clear, durable identification
• 3-flat shank prevents slipping in the chuck and enables high-torque transmission
• Suitable for non-ferrous metals, sheet plastic, sheet steel, plastic, and stainless steel