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

Taking advantage of the HSS construction with a spiral flute and a 118° split point delivers precise, repeatable step drilling from 4 to 12 mm with reduced walking and improved chip control. Order the original tool via Metav Werkzeuge or consult our product specialists for application advice.

RUKO step drill 4–12 mm — HSS step drill with spiral flute and split point

The RUKO step drill 4–12 mm is a high-speed steel step drill for step-wise hole enlargement from 4 to 12 mm, equipped with a spiral-grooved flute and a cross grind split point to aid centring and cutting stability

HSS construction for durable cutting performance
Spiral flute for effective chip evacuation
118° split point for reduced walking and fast centring
Shank with 3 flats for secure clamping

Precision cutting for consistent hole quality

The solid high-speed steel (HSS) body and the defined step geometry produce repeatable holes across the 4–12 mm range. A step drill delivers several diameters in a single tool, so fewer tool changes are required during production runs. The presence of two cutting edges and a clear step angle of 90° reduces the tendency for burr formation at each diameter change; this leads to shorter rework cycles and a smoother workflow. For workshops that value process reliability, the tool’s construction converts technical specifications into measurable time savings on routine operations.

Cleaner chips and improved centring for efficient drilling

The spiral-grooved flute promotes continuous chip removal along the entire cutting zone, lowering heat build-up and reducing the risk of clogging—especially when drilling progressive diameters. The split point with a 118° tip angle (cross grind) aids precise centring on the workpiece, minimising the need for pilot holes and preventing scuffing at the drill entry. In practice, this means fewer aborted holes and a higher first-pass yield; the design translates technical details into clear benefits for throughput and component quality.

Secure clamping and effortless tool handling

A shank with three flats ensures the step drill seats firmly in chucks and holders, preventing slippage under higher torque and enabling stable operation even at heavier feed rates. The tool’s nine-step progression allows controlled enlargement without overloading the cutter, making it suitable for repeated operations in a production environment. Short set-up times and predictable clamping behaviour reduce machine idle time and help maintain consistent hole tolerances across batches.

Built for reliable workshop use and traceable quality

Manufactured by a precision-tool specialist, the step drill combines established geometries with workmanship aimed at day-to-day industrial use. The concise specification—HSS, spiral flute, 2 cutting edges, 118° point—supports informed purchasing decisions and eases integration into existing machining routines. For procurement teams seeking dependable supply, this item fits a clear quality profile and aligns with efficient replacement strategies without unnecessary complexity.

For ordering or tailored advice on the RUKO step drill, contact Metav Werkzeuge—technical consultants are available via info@metav-werkzeuge.com or by phone at +49 2822 7131930 to discuss application specifics and delivery options

Technical data

• Article number: 4000601707NW
• Label: Step drill 4–12 mm HSS spiral flute, 2 cutting edges, 9 steps, RUKO
• Manufacturer: Ruko GmbH Präzisionswerkzeuge

Core technical figures

• Range: 4–12 mm
• Steps: 9
• Point angle: 118°
• Step angle: 90°
• Cutting edges: 2
• Packaging unit: 1

Special features

• Material: HSS
• Flute: spiral-grooved
• Split grind (cross grind)
• Shank with 3 flats
• Step drill geometry

FAQ

What hole sizes does the step drill cover?
The RUKO step drill 4–12 mm covers a continuous range from 4 mm up to 12 mm through its staged design, allowing multiple diameters with a single tool.

How many steps are included and what does that mean?
This tool has nine steps; each step represents a defined diameter increment, enabling progressive enlargement without changing tools during the sequence.

Why is the 118° split point useful?
A 118° split point with cross grind aids centring and reduces walking at the start of the cut, improving hole accuracy for the RUKO step drill and lowering the need for pilot drilling.

Is the tool suited for standard chucks and holders?
Yes. The shank with three flats provides reliable seating and torque transfer in conventional chucks and tightening systems.

How many cutting edges are on the tool and how does that affect performance?
The step drill features two cutting edges; this geometry balances cutting force and surface finish while supporting efficient chip formation across the stepped diameters.

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