Drill bit step HSS TiAlN GEKO G38560 4–12 mm, for sheet and thin materials

Step drill bit GEKO G38560 is a single-flute HSS tool with a TiAlN coating, offering a cutting diameter range from 4 to 12 mm. It is engineered for enlarging existing holes and drilling through thin sheet metals, plastics and laminates without the need to change tools. The stepped geometry provides progressive cutting across the diameter range, enabling users to create clean, consistent holes of different sizes with one tool. The TiAlN coating increases surface hardness and thermal resistance, while the HSS core maintains toughness for reliable performance in general metalworking and light fabrication tasks.

Advantages

The single-flute stepped design reduces friction and provides controlled chip evacuation, contributing to smoother cutting and longer tool life when used on thin materials. The TiAlN coating enhances wear resistance and heat protection, allowing higher cutting speeds and reduced tendency to gall on metal surfaces. With a wide 4–12 mm range in a single tool, the bit minimizes tool changes and streamlines workflows for electricians, HVAC technicians and maintenance personnel working with sheet metal, plastics and laminates.

Suitable for

• Drilling and enlarging holes in thin sheet metal (steel, aluminium)
• Creating holes in plastic panels and laminates
• Electrical installation tasks requiring multiple hole sizes
• HVAC ductwork and mounting tasks in thin materials
• Light fabrication and maintenance where clean, deburred holes are needed

Key specifications

• Material: High-speed steel (HSS) core
• Coating: Titanium aluminium nitride (TiAlN)
• Cutting diameter range: 4–12 mm (stepped increments)
• Geometry: Single-flute stepped design for progressive drilling
• Intended material thickness: Thin sheets, plastics and laminates

How to use

Clamp the workpiece securely and mark the desired hole position. Use a drill press or handheld drill with appropriate speed control, starting at a moderate RPM and increasing slightly as needed; the TiAlN coating allows for higher speeds than uncoated HSS in many cases. Align the bit perpendicular to the surface, apply steady feed pressure and allow the stepped geometry to cut progressively through the material until the required step is reached. Withdraw the bit periodically to clear chips and inspect hole quality. For plastics and laminates, reduce speed and feed to avoid melting or delamination.

Usage recommendations

Use cutting lubricant when drilling ferrous materials to extend tool life and improve finish. For best results on thin metals, support the sheet near the drilling point to reduce deformation and produce cleaner, burr-free holes. Avoid excessive lateral force to preserve the stepped geometry and maintain consistent hole sizes across the 4–12 mm range.