21mm Core Drill HSS 55mm Cutting Depth Weldon Shank - Ruko GmbH

Take advantage of the HSS construction, 55 mm cutting depth and Weldon shank to ensure reliable, repeatable holemaking in a workshop or production setting; order the tool directly via Metav Werkzeuge or consult the team for application guidance.

Kernbohrer D.21mm HSS, 55 mm cutting depth — RUKO core drill with Weldon shank

Kernbohrer D.21mm HSS, 55 mm cutting depth — RUKO core drill with Weldon shank is a heavy-duty annular cutter designed for efficient metal holemaking in structural and sheet applications

• High-speed steel construction
• 21 mm diameter for precise bores
• 55 mm effective cutting depth
• Weldon 19.05 mm shank for secure clamping

Precise metal cutting for consistent production results

The HSS composition of this annular cutter guarantees a balance of hardness and toughness suitable for demanding metalworking. With a 21 mm cutting diameter and 55 mm effective cutting depth, the tool produces accurate, burr-reduced holes while preserving the parent material. High-speed steel resists work hardening and maintains cutting geometry during interrupted cuts, which translates into fewer rework steps and steady throughput. This combination of material and geometry supports stable cycle times in both small-batch and continuous operations.

Secure mounting and smooth chip evacuation for safer operation

A Weldon shank 19.05 mm (3/4") enables rigid clamping in standard Weldon holders, reducing runout and vibration compared with plain-shank alternatives. The cutter’s multi-edge configuration (six cutting edges) and annular design remove a metal ring rather than the full core, minimising power draw and simplifying chip removal. The result is reduced feed forces and improved operator safety, especially when machining thicker sections such as T‑beams or large-format plates. The shorter overall length of 88 mm supports access in confined fixturing and keeps tool overhang to a minimum.

Versatile applications and straightforward workshop benefits

Engineered for a broad range of materials, the cutter is suited to steel, cast iron, and a variety of non-ferrous and light metals, offering a single-tool solution for mixed-material workloads. The annular design shortens cycle times compared with twist drills of equivalent diameter and reduces the need for post‑drilling finishing. For workshops aiming to streamline tooling inventory without compromising accuracy, this cutter provides a pragmatic mix of durability and efficiency that supports repeatable, high-quality bores with minimal setup complexity.

For procurement or application advice on the RUKO HSS core drill, contact Metav Werkzeuge for order placement and technical consultation via info@metav-werkzeuge.com or by phone on +49 2822 7131930 — Metav’s specialists assist with selection for specific materials and machine interfaces.

Technical Data

• Article number: 4000602452NW
• Name: Kernbohrer D.21mm HSS Schnitt-T.55mm Weldon RUKO
• Manufacturer: Ruko GmbH Präzisionswerkzeuge

Facts

• Diameter: 21 mm
• Effective cutting depth: 55 mm
• Overall length: 88 mm
• Shank: Weldon 19.05 mm (3/4")
• Cutting edges: 6
• Material: HSS

Special features

• Suitable for steel, cast iron, non-ferrous and light metals
• Weldon shank for secure toolholding
• Annular cutter design for faster holemaking
• Packaging unit: 1

FAQ

What materials can this core drill machine effectively cut?
The Kernbohrer D.21mm HSS is designed for steel, cast iron and a range of non‑ferrous and light metals, providing versatile performance across typical workshop materials.

Which toolholder is required for safe clamping of this cutter?
A Weldon holder or chuck compatible with a 19.05 mm (3/4") Weldon shank is required to secure the RUKO annular cutter for minimal runout.

How deep can the cutter bore in a single pass?
The cutter offers a 55 mm effective cutting depth for through or deep-penetration holes, with an overall length of 88 mm to suit constrained setups.

Is the cutter suitable for use on structural steel profiles like T‑beams?
Yes; the tool’s HSS construction and annular design are suitable for structural steel such as T‑beams and large-format plates, reducing cutting forces and cycle time.

How many cutting edges does the tool have and what is the benefit?
The annular cutter features six cutting edges, which support smooth material removal and a fine bore finish while distributing cutting forces for improved tool life.

Manufacturer/Responsible: Ruko GmbH Präzisionswerkzeuge, Robert-Bosch-Strasse 7, 71088 Holzgerlingen