Drill bit Tvardy HSS M2 TiAlN step drill 4–20 mm (200)

Tvardy HSS M2 TiAlN step drill 4–20 mm (200) is a set of step drill bits manufactured from high-speed steel (HSS M2) with a titanium aluminum nitride (TiAlN) coating. Each bit covers a diameter range of 4 to 20 mm in stepped increments, allowing progressive enlargement of holes in sheet materials and thin metals with a single tool. The set is intended for repetitive tasks in fabrication, maintenance and workshop environments and is supplied in a pack quantity of 200 pieces.

Advantages

The HSS M2 substrate provides high hardness and heat resistance for extended cutting life, while the TiAlN coating reduces friction and improves wear resistance during prolonged use. Using step drill bits eliminates the need to change multiple twist drills to reach different diameters, saving time and reducing tool changes. The stepped geometry creates clean, deburred holes in thin materials and helps maintain concentricity when enlarging existing holes.

Suitable for

• Progressive drilling in sheet metal and thin steel
• Electrical panels and enclosure work
• Plumbing and HVAC installations where multiple hole sizes are required
• General workshop tasks and maintenance operations

Key specifications

• Material: high-speed steel (HSS M2) with TiAlN coating
• Diameter range: 4–20 mm (stepped increments)
• Type: step drill bit
• Suitable materials: sheet metal, thin steel, non-ferrous metals and some plastics
• Pack quantity: 200 pieces

How to use

Secure the workpiece and mark the drilling point. Mount the step drill bit in a drill with an appropriate chuck and run at recommended speeds for the material being drilled (lower speeds for harder metals). Start drilling with light pressure, allowing the stepped geometry to cut progressively through the material. Withdraw the bit periodically to clear chips and reduce heat buildup. For larger steps, finish with the final step until the desired diameter is reached.

Usage recommendations

Apply cutting fluid when drilling steel or other hard metals to extend tool life and improve hole quality. Use steady feed and avoid excessive side loads to prevent chipping the cutting edges. For thin or flexible sheets, support the workpiece to avoid deformation during drilling.