RUKO STB-HSS-TiN Step Drill Bit 4-20 mm, 9 Steps, HSS TiN Coated

Drilling, deburring, and reaming in one operation can be time-consuming with standard twist drills, especially when working with thin sheets or profiles. This step drill bit solves that problem by combining multiple diameter steps in a single tool, allowing you to create clean, burr-free holes without changing bits.

Who is it for

Ideal for metalworkers, electricians, and maintenance technicians who frequently drill holes in thin materials such as steel, non-ferrous metals, plastics, and stainless steel up to 850 N/mm². It is particularly useful for panel work, enclosures, and sheet metal fabrication.

Main features

• High-speed steel (HSS) body with titanium nitride (TiN) coating for increased heat resistance, wear resistance, and reduced friction.
• Step range from 4.0 mm to 20.0 mm in 2 mm increments, providing 9 steps.
• Self-centering cross-ground point according to DIN 1412 C ensures accurate starting without a pilot hole.
• Straight flute design and right-hand cutting direction for efficient chip removal.
• Cylindrical shank with 10 mm diameter fits standard drill chucks.
• Total length of 75 mm and maximum material thickness of 4 mm.
• 118° point angle for general-purpose drilling.

Specifications

• Material: High-Speed Steel (HSS)
• Coating: Titanium Nitride (TiN)
• Drilling diameter range: 4.0 - 20.0 mm
• Number of steps: 9
• Step increments: 2 mm
• Shank type: Cylindrical
• Shank diameter: 10 mm
• Total length: 75 mm
• Flute type: Straight flute
• Point angle: 118°
• Self-centering tip: Yes (cross-ground point according to DIN 1412 C)
• Cutting direction: Right-hand cutting
• Recommended materials: Steel, non-ferrous metals, plastics, thin sheets, stainless steel (up to 850 N/mm²)
• Max material thickness: 4 mm
• Tool holder compatibility: Drill chuck
• Surface finish: Golden (TiN coated)
• Application: Drilling, deburring, and reaming in one operation
• Increased properties: Heat resistance, wear resistance, reduced friction

Tips

Use cutting fluid or lubricant when drilling stainless steel to extend tool life. Ensure the workpiece is securely clamped to prevent movement. For best results, start at low speed and increase as needed.