RUKO BSB-HSS-TiN Step Drill Bit 24-40 mm with Titanium Nitride Coating

Sheet metal fabricators and maintenance technicians who need to enlarge or deburr holes in thin materials will appreciate the RUKO BSB-HSS-TiN step drill bit. Its 9 steps from 24 mm to 40 mm in 2 mm increments allow precise, burr-free drilling without changing tools.

Key specifications

• Tool type: Step drill bit
• Material: High-speed steel (HSS)
• Coating: Titanium nitride (TiN)
• Diameter range: 24.0 - 40.0 mm
• Number of steps: 9
• Step increments: 2 mm
• Shank type: Cylindrical with 3-flat drive
• Shank diameter: 12 mm
• Total length: 104 mm
• Maximum material thickness: 4 mm
• Flute type: Straight flute
• Point angle: 118°
• Cutting direction: Right-hand cutting
• Standard: DIN 1412 C
• Recommended material hardness: Up to 900 N/mm²
• Application: Sheet metal, non-ferrous metals, plastics, thin steel sheets

Why choose it

The TiN coating reduces friction and heat build-up, extending tool life and improving cutting performance in abrasive materials. The 3-flat shank prevents slipping in the drill chuck, ensuring secure power transmission.

Ideal use cases

• Enlarging existing holes in sheet metal up to 4 mm thick
• Creating precise, step-shaped holes for cable glands or conduit fittings
• Deburring and chamfering holes in one operation
• Drilling in non-ferrous metals, plastics, and thin steel sheets

Good to know

The step drill bit is designed for use in hand-held drills and stationary machines. For best results, use a cutting fluid on harder materials and keep the speed moderate to avoid overheating.