RUKO STB-HSS-TiAlN Step Drill Bit 6-38 mm, 12 Steps

Drilling, deburring, reaming, and countersinking in one operation can be time-consuming when using multiple tools. This step drill bit solves that problem by combining all four functions into a single bit, allowing you to create precise, burr-free holes in thin materials up to 4 mm thick without changing tools.

Who is it for

Professionals and advanced DIYers working with sheet metal, stainless steel, non-ferrous metals, and plastics. Ideal for electricians, plumbers, metal fabricators, and anyone who needs clean, accurate holes in thin materials quickly.

Main features

• High-speed steel (HSS) body with TiAlN coating for extended tool life and heat resistance.
• 12 steps from 6 mm to 38 mm in 3 mm increments, each step clearly marked.
• Cross-ground split point for self-centering and reduced walking.
• 3-flat shank (10 mm) prevents slipping in the drill chuck.
• Spiral flute design for efficient chip removal.
• Right-hand cutting direction, 118° point angle.

Specifications

• Drill bit type: Step drill bit
• Material: High-speed steel (HSS)
• Coating: Titanium aluminum nitride (TiAlN)
• Diameter range: 6–38 mm
• Number of steps: 12
• Step diameters: 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 38 mm
• Shank type: 3-flat shank
• Shank diameter: 10 mm
• Overall length: 105 mm
• Max material thickness: 4 mm
• Point angle: 118°
• Cutting edge: Cross-ground (split point)
• Drilling direction: Right-hand cutting
• Flute type: Spiral flute
• Recommended materials: Steel, stainless steel, non-ferrous metals, plastics
• Standard: DIN 1412 C (point geometry)
• Self-centering: Yes

Tips

Use cutting oil when drilling stainless steel to prolong tool life. For best results, use a drill press or a steady hand to keep the bit perpendicular to the workpiece. The step drill bit works best on materials up to 4 mm thick.