Drill bit GEKO step HSS TiAlN 4–39 mm, stepped drill, pack of 50

Step drill bit GEKO step HSS TiAlN 4–39 mm is a stepped (conical) drill designed to create progressively larger holes in thin materials. Made on an HSS substrate and finished with a TiAlN (titanium aluminum nitride) coating, the bit covers a continuous cutting range from 4 mm up to 39 mm and is supplied as a pack of 50 identical pieces intended for workshop and production use where repeated incremental drilling is required.

Advantages

The TiAlN coating increases surface hardness and heat resistance compared with uncoated HSS, improving wear resistance during high-speed or continuous drilling. The stepped geometry allows multiple hole diameters to be produced with a single tool, reducing tool changes and setup time. Supplied in a bulk pack of 50, the set supports repetitive tasks and production environments by ensuring consistent tool availability and reduced downtime.

Suitable for

• Drilling progressively larger holes in thin metal sheets (steel, stainless steel, aluminum)
• Creating stepped holes in plastic and composite panels
• Workshop and production-line repetitive drilling tasks
• Deburring and enlarging existing holes to intermediate diameters

Key specifications

• Cutting range: 4–39 mm in stepped increments
• Material substrate: High-speed steel (HSS)
• Coating: TiAlN (titanium aluminum nitride) for improved heat and wear resistance
• Geometry: Stepped (conical) profile for multiple diameters per tool
• Pack quantity: 50 identical drill bits

How to use

Secure the workpiece and mark the initial drilling point. Install the step drill bit in a compatible drill or drill press chuck, ensuring proper centering and tight clamping. Start at low to moderate speed appropriate for the material—lower speeds for stainless steel and harder alloys, higher speeds for softer metals and plastics. Apply steady, moderate feed pressure and allow the bit to cut progressively through each step until the desired diameter is reached. Use cutting fluid or lubricant when drilling steel or stainless steel to extend tool life and reduce heat buildup. After use, inspect the cutting edges and clean off debris before storage.

Usage recommendations

For best results, select drill speeds and feed rates suited to the workpiece material, apply cutting fluid when machining ferrous metals, and replace bits from the pack when signs of wear or chipping appear to maintain hole quality and extend overall productivity.