RUKO Step Drill Bit HSS TiN Coated 4-12 mm 9 Steps Straight Shank 6 mm

With a cutting diameter range of 4.0 to 12.0 mm in 1 mm increments, this step drill bit from RUKO GMBH drills, deburrs, and reams in one operation. The TiN coating on high-speed steel reduces friction and enhances wear resistance for efficient drilling in sheet metal, non-ferrous metals, plastics, and thin stainless steel.

Overview

The RUKO GMBH STB-HSS-TiN-Ø4,0-12,0mm-Gr.9-S-SP is a 9-step drill bit with a straight shank of 6 mm diameter. Its spiral flute design and 118° point angle ensure smooth chip evacuation and precise hole sizing. The TiN (Titanium Nitride) coating provides a hard, low-friction surface that extends tool life and improves cutting performance.

What stands out

• 9 steps from 4 mm to 12 mm in 1 mm increments
• TiN coating for reduced friction and longer life
• Spiral flute for efficient chip removal
• Straight shank fits standard drill chucks
• Ideal for thin materials up to 4 mm per step

Technical details

• Material: High-Speed Steel (HSS)
• Coating: Titanium Nitride (TiN)
• Drill Type: Step Drill Bit
• Cutting Diameter Range: 4.0 - 12.0 mm
• Number of Steps: 9
• Step Increments: 1 mm
• Shank Type: Straight Shank
• Shank Diameter: 6 mm
• Overall Length: 66 mm
• Max Material Thickness (per step): 4 mm
• Point Angle: 118°
• Flute Type: Spiral Flute
• Standard Compliance: DIN 1412 C
• Recommended Materials: Sheet metal, non-ferrous metals, plastics, stainless steel (thin gauge)
• Application: Drilling, deburring, and reaming in one operation
• Tool Compatibility: Corded/Cordless Drills, Drill Presses
• Cutting Direction: Right-hand cutting

Our verdict

A versatile step drill bit for precise, multi-diameter holes in thin materials. The TiN coating and HSS construction deliver durability and clean cuts, making it a reliable choice for professionals and DIY enthusiasts.