150mm Step Drill HSS Spiral Flute 2-Flute 118° Tip 90° Step Angle - Ruko GmbH

Combining HSS construction, a spiral-fluted geometry and a cross-ground 118° point, this step drill delivers fast, repeatable hole stepping and reliable clamping — order directly via Metav Werkzeuge or consult our advisors for application guidance.

RUKO step drill 6–32 mm — HSS, spiral-fluted, 2 cutting edges

The RUKO step drill 6–32 mm is a hardened, high-speed-steel step drill for efficient hole enlargement and precise staged drilling in thin to medium workpieces

• HSS, spiral-fluted design
• Cross-ground 118° point angle
• Covers 6–32 mm step range
• Shank with three flats for secure clamping

Faster holemaking with fewer tool changes

The combination of HSS material and a multi-step profile reduces the need for multiple drills, enabling rapid progression through the 6–32 mm range with a single tool. The spiral-fluted geometry improves chip evacuation compared with straight flutes, so drilling cycles run more smoothly and less time is lost on clearing swarf. This results in measurable time savings on repetitive operations and fewer tool changes across batch runs.

Secure clamping and consistently accurate stages

A shank fitted with three flats ensures secure seating in chucks or collets, reducing slippage and improving concentricity during drilling. The tool’s 2 cutting edges and cross-ground geometry produce even cutting forces, delivering consistent step diameters and reducing the need for rework. The 118° point angle aids precise centring, particularly when starting holes without pilot drills, so repeatability in production is improved.

Cleaner holes and easier finishing

The distinct 90° step angle defines each diameter cleanly, helping to avoid oversized transitions and minimise burr formation at each stage. The cross-ground tip reduces vibration and burnishing, producing smoother hole walls that need less finishing. For workshops seeking a balance between productivity and surface quality, this stepped drill bit offers a straightforward way to achieve acceptable results without additional deburring steps.

Practical benefits for the workshop and cost control

Using a single stepped tool instead of several standard bits reduces inventory and shortens set-up times, which supports leaner workflows on the shop floor. The robust construction and clear step definition help maintain performance across multiple cycles, contributing to lower tooling consumption. Metav’s distribution ensures access to technical advice and reliable supply from Emmerich, reinforcing continuity in workshop operations and purchasing confidence.

Contact Metav Werkzeuge today for expert advice on whether the RUKO step drill 6–32 mm fits specific tasks and to arrange supply directly via info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical Data

• Article number: 4000601713NW
• Label: Stufenbohrer Bohrber.6-32mm HSS Spiralnut Z.2 Stufen 8 RUKO
• Manufacturer: Ruko GmbH

Facts

• Diameter range: 6–32 mm
• Steps: 8
• Cutting edges: 2
• Point angle: 118°
• Step angle: 90°
• Shank: 3 flats

Special features

• HSS material
• Spiral-fluted (spiralled groove)
• Cross-ground tip
• Designed for staged drilling and rapid hole enlargement

FAQ

What materials is this step drill suitable for?
The answer depends on the workpiece; the RUKO step drill 6–32 mm is an HSS stepped tool intended for general-purpose staged drilling in thin to medium metallic sheets and similar substrates where a single-tool hole enlargement strategy is advantageous.

How many steps does the drill include and what range is covered?
This stepped drill provides 8 distinct steps covering a 6–32 mm diameter range, allowing progressive enlargement without tool changes.

How does the spiral flute affect performance?
The spiral-fluted design improves chip evacuation compared with straight flutes, supporting smoother drilling cycles and reducing clogging at each step when the RUKO stepped tool is used under appropriate speeds and feeds.

Is special clamping required for this bit?
A shank with three flats is provided to enable secure clamping in standard chucks or collets, helping to maintain concentricity and prevent slippage during staged drilling operations.

What does the cross-ground tip provide in everyday use?
The cross-ground tip reduces axial vibration and assists in centring, which improves surface finish and dimensional consistency across the stepped diameters when the tool is used with suitable machine settings.

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