Bosch Hex Shank HSS-AlTiN Step Drill Bit

The Bosch Hex Shank HSS-AlTiN Step Drill Bit is a versatile stepped drill bit designed to drill smooth, burr-free holes across multiple diameters using a single bit — covering a step diameter range of 4–20mm.

The AlTiN coating and HSS (high-speed steel) construction combine to deliver excellent cutting performance and extended tool life, particularly when used with coolant. The split-point tip eliminates the need for pre-punching, allowing clean starts on thin materials including sheet steel, stainless steel, non-ferrous metals, and sheet plastic.

CNC ground spiral flutes optimise chip removal and reduce vibration during drilling, while axial and radial relief grinding ensures consistent cutting smoothness throughout each step. The ¼" hex shank provides a secure, high-torque connection in both three-jaw chucks and ¼" internal hex tool holders.

Laser-marked diameter figures engraved into both spiral flutes remain clearly visible throughout the bit's working life, making it straightforward to select the correct step on site. This bit is well suited to electricians, sheet metal workers, and contractors who regularly need to drill or enlarge holes in thin material to precise diameters.

Features and Benefits:
• Drills multiple hole diameters from 4–20mm with a single stepped bit
• AlTiN coating combined with HSS construction for extended cutting life
• Split-point tip for self-starting — no centre punch required
• CNC ground spiral flutes for optimised chip removal and reduced vibration
• Axial and radial relief grinding for consistent cutting smoothness
• ¼" hex shank for secure fit in three-jaw chucks and hex tool holders
• Laser-marked diameter figures in both flutes for easy, durable identification
• Suitable for sheet steel, stainless steel, non-ferrous metals, and sheet plastic

Specifications:
Total Length: 70.5mm
Shank Diameter: ¼" (inch)
Step Diameter Range: 4–20mm
Step Height: 4mm
Version: HSS-AlTiN
Net Weight: 0.070kg