RUKO Step Drill Bit HSS-Co 5, 6.5-32.5mm, 12 Steps, 3-Flatted Shank

Step drill bit with a 6.5 to 32.5 mm drilling range in HSS-Co 5 cobalt steel, delivering 12 precise steps for enlarging holes in sheet metal and plastics without a pilot drill.

Overview

The RUKO STB-HSSCo-6,5-32,5mm-(Sonder) is a step drill bit made from HSS-Co 5 (high-speed steel with 5% cobalt), offering enhanced heat resistance and durability for demanding drilling tasks. It features a cylindrical shank with three ground clamping surfaces to prevent slippage in the drill chuck.

What stands out

• 12-step design covers diameters from 6.5 mm to 32.5 mm, eliminating the need for multiple drill bits.
• Spiral flute geometry efficiently clears chips, reducing friction and heat buildup.
• Cross-ground (split point) conical tip provides accurate centering and reduces walking on smooth surfaces.
• Bright uncoated finish minimizes material adhesion and allows easy resharpening.
• Suited for stainless steel, sheet metal, non-ferrous metals, thermoplastics, and thermosetting plastics up to 4 mm thick.

Technical details

• Product type: Step drill bit
• Material: HSS-Co 5
• Drilling diameter range: 6.5 - 32.5 mm
• Number of steps: 12
• Step diameters: 6.5, 9, 11.5, 14, 16.5, 19, 21.5, 24, 26.5, 29, 31.5, 32.5 mm
• Shank type: Cylindrical, 3-surface ground
• Shank diameter: 10 mm
• Overall length: 100 mm
• Working length (flute length): 60 mm
• Point angle: 118°
• Cutting edge geometry: Conical point, cross-ground (split point)
• Flute geometry: Spiral flute
• Surface finish: Bright (uncoated)
• Max material thickness: 4 mm
• Standard: DIN 1412 C (point geometry)

Our verdict

A versatile step drill for professionals working with thin materials, offering a wide diameter range and reliable performance in tough alloys.