RUKO Step Drill Bit HSS 4.0-12.0 mm, 9 Steps, Split Point, 6 mm Shank

For metalworkers and maintenance technicians who need clean, precise holes in sheet metal and plastics, the RUKO step drill bit covers diameters from 4.0 to 12.0 mm in nine 1.0 mm increments. The split point starts on contact without walking, and the spiral flute clears chips quickly, so you can drill, deburr, and ream in one pass.

Key specifications

• Material: High-Speed Steel (HSS)
• Drill type: Step drill bit
• Diameter range: 4.0 - 12.0 mm
• Number of steps: 9
• Step increments: 1.0 mm
• Shank type: Cylindrical, 6.0 mm diameter
• Point type: Split point, 118° angle
• Flute type: Spiral
• Surface finish: Bright (uncoated)
• Maximum material thickness: 4.0 mm
• Overall length: 66 mm
• Step length: 4 mm
• Standard: DIN 1412 C
• Series/Type: Type 100

Why choose it

The HSS construction holds an edge in non-ferrous metals, plastics, and wood, while the split point reduces thrust pressure for easier drilling in thin materials. The bright finish keeps the cutting edges sharp and free of coatings that could affect hole size.

Ideal use cases

• Enlarging existing holes in sheet metal up to 4 mm thick
• Deburring and reaming holes in one operation
• Drilling clean holes in plastic enclosures and panels
• Working with non-ferrous metals like aluminium and brass

Good to know

The step drill is designed for use in a drill press or handheld drill with a 6 mm chuck. For best results, use a cutting fluid on metal and keep the speed moderate to avoid overheating the cutting edges.