RUKO STB-HSS Ø20-30mm Core Drill (Annular Cutter) with Weldon 19 mm Shank

The RUKO STB-HSS Ø20-30mm Aufbohrer is a core drill designed for enlarging existing holes with precision. Unlike standard twist drills, its hollow annular cutting geometry removes only the periphery, reducing power consumption and producing clean, burr-free bores. The high-speed steel body with bright finish ensures durability across a range of metals, while the Weldon 19 mm shank provides secure mounting in magnetic drilling machines and compatible pillar drills.

Highlights

• Annular cutter for hole enlargement and core drilling
• High-speed steel (HSS) with bright finish
• Cutting diameter 20 mm, cutting depth 30 mm
• Weldon 19 mm (3/4") shank for stable tool holding
• Four flutes for efficient chip evacuation
• Suitable for steel, stainless steel, cast iron, and non-ferrous metals

In daily use

This core drill excels when you need to open up an existing hole to a precise 20 mm diameter without drifting. The hollow design keeps chips flowing outward, reducing heat and extending tool life. External coolant supply is recommended for optimal performance in tough materials. Its 63 mm overall length fits most magnetic drill setups, making it a practical choice for on-site fabrication and maintenance tasks.

Full specifications

• Material: High-Speed Steel (HSS)
• Drill Type: Core Drill (Annular Cutter)
• Cutting Diameter: 20 mm
• Cutting Depth: 30 mm
• Shank Type: Weldon 19 mm (3/4")
• Number of Flutes: 4
• Application Materials: Steel, Stainless Steel, Cast Iron, Non-ferrous metals
• Coating: Uncoated (Bright Finish)
• Overall Length: 63 mm
• Tool Holder Compatibility: Magnetic drilling machines, pillar drills with Weldon adapter
• Coolant Supply: External
• Chip Evacuation: Excellent due to hollow design
• Recommended Use: Hole drilling, enlarging existing holes
• Manufacturing Standard: RUKO Standard
• Tolerance: h8

Final note

RUKO's STB-HSS series is built for professionals who demand clean, accurate holes without secondary finishing. The Weldon shank ensures a rigid connection, minimizing vibration and extending tool life.