Drill bit GEKO step HSS TiAlN 4–20 mm, model G38561, pack of 200

Step drill bit GEKO HSS with TiAlN coating, diameter range 4–20 mm, supplied in a pack of 200. This stepped cutter is made from high-speed steel (HSS) and finished with a titanium aluminum nitride (TiAlN) coating to increase surface hardness and heat resistance. The tool features a series of progressively larger cutting diameters on a single body, allowing multiple hole sizes to be produced or enlarged without tool changes. It is intended for use on sheet metal and other thin materials where quick, repeatable hole production is required.

Advantages

The TiAlN coating improves wear resistance and reduces heat build-up during continuous drilling, extending tool life compared with uncoated HSS. The stepped geometry enables rapid transition between hole sizes and reduces the need for pilot drilling and retooling. Supplied as a pack of 200, the set supports high-volume or repetitive operations and helps maintain consistent hole quality across runs. The HSS base material provides toughness to withstand oscillating loads typical in metalworking tasks.

Suitable for

• Drilling and enlarging holes in thin steel and non-ferrous sheet metal
• High-volume production and repetitive drilling tasks
• Metalworking workshops and maintenance operations
• Applications requiring multiple hole sizes without changing tools

Key specifications

• Material: high-speed steel (HSS)
• Coating: titanium aluminum nitride (TiAlN)
• Cutting diameter range: 4–20 mm in progressive steps
• Geometry: stepped drill bit for multiple hole sizes on one tool
• Pack quantity: 200 pieces

How to use

Secure the step drill bit in a drill or drill press chuck rated for the bit shank diameter. Mark the hole position and, if necessary, clamp the workpiece to prevent movement. Start drilling at low to moderate speed, applying steady feed pressure to allow the TiAlN coating to dissipate heat. Use appropriate cutting fluid when working with stainless steel or thicker materials to improve chip evacuation and reduce wear. Advance until the desired step is reached to achieve the required hole diameter; withdraw the bit slowly while rotating to clear chips.

Usage recommendations

For consistent results, select drilling speeds and feed rates suitable for thin sheet metals and non-ferrous alloys, and inspect bits regularly for wear. Replace worn bits to avoid oversized or torn hole edges. Store the pack in a dry environment to protect the coating and cutting edges.