RUKO STB-Bit-HSS-TiN 4.0-20.0 mm Step Drill Bit

Drilling clean, burr-free holes in thin sheet metal often requires multiple bits and tedious deburring. This step drill bit solves that problem by combining drilling, deburring, and reaming into one tool, producing perfectly round holes from 4 to 20 mm in a single operation.

Who is it for

Professional metalworkers, electricians, and serious DIYers who regularly work with sheet metal, non-ferrous metals, plastics, or thin steel sheets will appreciate the time savings and hole quality this bit delivers.

Main features

• High-speed steel (HSS) body with titanium nitride (TiN) coating for extended life and reduced friction
• Nine steps: 4, 6, 8, 10, 12, 14, 16, 18, 20 mm diameter, each with 2 mm increments
• Straight flute design for efficient chip evacuation in thin materials
• 3-flat shank prevents slipping in the drill chuck
• 118° point angle for accurate starting without a center punch
• Maximum material thickness: 4 mm

Specifications

• Drill bit type: Step drill bit
• Material: High-speed steel (HSS)
• Coating: Titanium nitride (TiN)
• Diameter range: 4.0 - 20.0 mm
• Number of steps: 9
• Step increments: 2.0 mm
• Shank type: 3-flat shank
• Shank diameter: 8 mm
• Overall length: 70 mm
• Flute type: Straight flute
• Point angle: 118°
• Cutting direction: Right-hand cutting
• Standard: DIN 1412 C

Tips

Use a low to medium speed and light, steady pressure. Apply cutting oil when drilling steel to prolong bit life. The 3-flat shank works best in a keyless chuck; tighten securely to prevent rotation.