58mm Step Drill 4–20mm HSS Spiral Flute 2-Flute 118° Tip 90° Step Angle Short Version - Ruko GmbH

Benefit from the combination of HSS construction, spiral-fluted geometry and a secure three-flat shank for efficient, burr‑free drilling in thin panels; order the tool directly via Metav Werkzeuge or consult our specialists for application advice.

Step drill bit 4–20 mm HSS, spiral-fluted — RUKO

The RUKO step drill bit designed for fast, precise holemaking in thin sheet and control cabinet work, featuring a short overall length and CBN-ground cutting geometry.

High-speed HSS construction
Spiral-fluted for fast chip evacuation
CBN-ground cutting edges
Three-flat shank for secure clamping

Faster holemaking across a wide diameter range

The compact step drill covers diameters from 4 to 20 mm in incremental steps, eliminating frequent tool changes and reducing cycle time on panel and cabinet assemblies. Its spiral-fluted design actively evacuates chips from the cutting zone, which lowers heat build-up and helps maintain consistent cutting forces. For production environments where speed and repeatability matter, this configuration translates into measurable process efficiency and fewer rejected parts.

Geometry that delivers clean edges and minimal burr

Precision cutting is achieved through a combination of CBN-ground flutes and a 118° tip, engineered according to DIN 1412‑C standards. The cross-ground point and a 90° step angle produce well‑formed holes with reduced burring, simplifying downstream finishing. Explaining briefly: the 118° tip concentrates cutting action at the centre, improving centring, while the 90° step angle ensures clear step transitions for reliable fastener fit and neat edge quality.

Short design and secure clamping for cabinet assembly

The short overall length limits deflection in thin materials and improves operator visibility when working inside enclosures. A three-flat shank provides positive drive in standard chucks and collets, preventing slippage during high-torque starts typical of panel drilling. This combination makes the tool especially suitable for electrical cabinet and control-panel fabrication up to 2.0 mm sheet thickness, where accessibility and precision are essential.

Durable cutting life and straightforward handling

Manufactured from HSS with two cutting edges and CBN finishing, the bit balances wear resistance with the ability to re-sharpen where appropriate, keeping life-cycle costs low. The short, robust form factor reduces the risk of breakage in demanding workshop use. For buyers seeking a reliable component for repetitive thin‑sheet work, the tool delivers consistent performance and easier process control when integrated into a well-managed production flow.

Discuss suitability and delivery from Metav Werkzeuge — contact our consultants at info@metav-werkzeuge.com or call +49 2822 7131930 for tailored application support and supply from our Emmerich hub

Technical data

• Article number (SKU): 4000601753NW
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• Description: Step drill bit 4–20 mm HSS, spiral-fluted, short version

Core data

• Diameter range: 4–20 mm
• Overall length: 58 mm
• Number of steps: 9
• Cutting edges: 2
• Point angle: 118°
• Step angle: 90°

Special features

• Material: HSS
• Flute: spiral-fluted
• Tip: cross-ground, DIN 1412‑C
• Finish: CBN-ground
• Shank: three-flat shank
• Short version for limited access
• Suitable for control cabinet construction up to 2.0 mm sheet thickness

FAQ

What materials can this step drill cut?
The RUKO step drill bit is made from HSS and, with its geometry and CBN finish, is suited to drilling thin steel panels and common sheet materials used in control cabinet construction up to 2.0 mm.

Does the tool require a special chuck?
No specialised chuck is required; the three-flat shank is designed for secure clamping in standard chucks and collets commonly used in workshop and production settings.

How does the CBN finish affect performance?
The CBN-ground finish on the cutting edges enhances edge sharpness and wear resistance, which supports longer tool life and more consistent hole quality compared with untreated edges.

Is the short design suitable for handheld drilling?
Yes, the short overall length improves stability and control during handheld or bench drilling, particularly when working inside enclosures or on panels with limited clearance.

What makes this tool appropriate for electrical cabinet work?
The combination of a spiral flute for efficient chip removal, a short robust design to reduce deflection and a three-flat shank for secure drive makes it well suited to the requirements of control cabinet and panel fabrication.

Ruko GmbH Präzisionswerkzeuge, Robert‑Bosch‑Strasse 7, 71088 Holzgerlingen