Step Drill Bit högert technik HT6D326 spiral 4–32 mm

Step drill bit högert technik HT6D326 spiral 4–32 mm is a stepped spiral drill designed for making and enlarging round holes in sheet materials. The tool covers a stepped diameter range from 4 mm up to 32 mm, allowing progressive drilling sizes with one cutter. Its spiral geometry supports continuous chip evacuation and reduces heat build-up during drilling in thin metals, plastics and similar materials used in electrical, HVAC and maintenance work.

Advantages

The spiral step design combines multiple hole diameters in a single bit, reducing tool changes and saving time when enlarging or finishing holes. Spiral flutes improve chip removal and help maintain a cleaner cutting edge, while the stepped profile provides controlled, concentric hole growth for precise fit of fasteners and fittings. The bit is suitable for handheld and drill-press use where progressive hole sizing is required.

Suitable for

• Cutting and enlarging holes in metal sheets such as steel and aluminium
• Drilling holes in plastic panels and thin composite materials
• Electrical and HVAC installation tasks requiring multiple hole diameters
• Maintenance and repair work where quick progressive hole sizing is needed

Key specifications

• Stepped diameter range: 4–32 mm
• Spiral flute geometry for efficient chip evacuation
• Designed for sheet materials and thin plates
• Suitable for handheld drills and drill presses

How to use

Mark the desired hole centre and secure the workpiece to prevent movement. Start drilling at low speed to position the bit and then increase speed according to material and drill type; use moderate feed pressure to let the stepped profile cut progressively through each diameter. For metal, apply cutting lubricant where appropriate to extend bit life and reduce heat. Retract the bit periodically to clear chips if drilling deeper through stacked materials.

Usage recommendations

Use appropriate personal protective equipment such as eye protection and gloves. For best results on metals, use cutting fluid and avoid excessive speed that may cause overheating. When drilling thin or flexible panels, clamp or back the workpiece to prevent deformation and ensure concentric holes.