RUKO HSS Step Drill Bit 5-13 mm, 9 Steps, 10 mm Shank

For metalworkers and maintenance technicians who need to enlarge or deburr holes in sheet metal, the RUKO STB-HSS-Gr.5-13/32-1 step drill bit offers a practical solution. It drills precise, burr-free holes in thin materials up to 4 mm thick, with a diameter range from 5 to 13 mm in 1 mm increments.

Key specifications

• Material: High-Speed Steel (HSS)
• Tool type: Step drill bit
• Number of steps: 9
• Diameter range: 5–13 mm
• Step increment: 1 mm
• Shank diameter: 10 mm
• Overall length: 90 mm
• Flute length: 50 mm
• Point angle: 118°
• Surface finish: Bright (uncoated)
• Flute type: Straight
• Standard: DIN 1412 C
• Tolerance: h8

Why choose it

Made from high-speed steel, this step drill bit stays sharp and withstands heat during continuous drilling. The straight flute design clears chips efficiently, and the 118° point angle allows for easy centering and smooth cutting. It is suitable for drilling, deburring, and reaming in sheet metal, non-ferrous metals, plastics, and wood.

Ideal use cases

• Enlarging existing holes in sheet metal
• Deburring and chamfering hole edges
• Drilling precise stepped holes in control panels
• Working with thin materials up to 4 mm thick

Good to know

Using coolant is recommended to extend tool life, especially when drilling harder materials. The cylindrical shank fits standard 10 mm drill chucks.