4‑12mm Step Drill HSS Spiral Flute 2‑Cut 118° Point 90° Step Angle - Ruko GmbH

Benefit from the combination of HSS durability and a spiral flute for efficient chip evacuation, plus the secure three-flat shank for stable clamping; order the RUKO step drill directly via Metav Werkzeuge or consult our specialists for application advice.

Step drill 4–12 mm HSS — RUKO 5-step, spiral-fluted

Step drill 4–12 mm HSS is a five-step high-speed steel drill designed for progressive diameter drilling with a spiral flute and a three-flat shank for reliable clamping.

• HSS construction for long tool life
• Spiral flute for smooth chip evacuation
• Split-point 118° for fast centring
• Shank with 3 flats for secure clamping

Faster workflows with fewer tool changes

The five-step geometry covering 4–12 mm allows sequential hole enlargement without frequent tool swaps, saving handling time and reducing setup complexity. With each step machined to precise transitions, the stepped drill ensures consistent diameters across operations; this reduces process interruptions and contributes to a more efficient production flow. The compact step progression is especially helpful where multiple hole sizes are required in short runs, improving throughput without additional tooling.

Precision cutting geometry for clean, centred holes

The combination of a 118° split-point and two cutting edges provides reliable centring and reduces wandering on start-up, so initial positioning is quicker and burr formation is minimised. The spiral flute assists continuous chip evacuation, lowering the risk of clogging and heat build-up at the cutting zone. These features work together to produce clean holes with defined edges and predictable finish, making the tool suitable for standard workshop and industrial drilling tasks where repeatability matters.

Secure clamping and stable machining behaviour

A shank with three flats offers positive gripping in keyed chucks and reduces rotational slip under load, translating torque directly into cutting action. The stepped design keeps axial forces predictable at each diameter change, helping to maintain tool life and reduce vibration. Combined with the robust HSS construction, the tool delivers dependable performance in routine applications where stability and a consistent drilling pattern are required.

Practical handling and reconditioning considerations

Maintenance is straightforward: keeping the cutting edges free from heavy build-up and using appropriate cutting speeds preserves geometry and prolongs service life. The tool’s two cutting edges and defined 90° step angle simplify regrinding when required, allowing for economical refurbishment rather than full replacement. For workshop managers seeking reliable tooling that balances serviceability with everyday performance, this stepped design offers a pragmatic choice.

Contact Metav Werkzeuge for availability and tailored technical advice on the RUKO step drill 4–12 mm HSS — email info@metav-werkzeuge.com or call +49 2822 7131930 to discuss suitability and delivery from Emmerich

Technical data

• Article number: 4000601706NW
• Label: Stufenbohrer Bohrber.4-12mm HSS Spiralnut Z.2 Stufen 5 RUKO
• Manufacturer: Ruko GmbH

Facts

• Diameter range: 4–12 mm
• Steps: 5
• Cutting edges: 2
• Point angle: 118°
• Step angle: 90°
• Shank: with 3 flats

Special features

• Material: High-speed steel (HSS)
• Flute: spiral-fluted
• Tip: cross-ground / split-point
• Design: two cutting edges, five-step progression

FAQ

What diameters are covered by this step drill?
The step drill covers diameters from 4 to 12 mm in five defined steps; the stepped progression allows sequential drilling without tool changes for intermediate sizes.

How does the split-point benefit drilling performance?
The 118° split-point on the RUKO step drill improves centring and reduces walking at start-up, enabling faster and more accurate hole initiation.

Is the shank suitable for standard chucks?
The shank features three flats for secure clamping; this design is intended to reduce slippage in keyed chucks and improve torque transmission during drilling.

How many cutting edges does the tool have and what is the flute type?
The tool has two cutting edges and a spiral flute, which together promote effective chip evacuation and a consistent hole finish.

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