4-30mm Step Drill HSS-Co5 Spiral Flute 2-Flute 118° Point 90° Step Angle - Ruko GmbH

Benefit from the combination of HSS‑Co5 durability and a 14‑step range for efficient, uninterrupted holemaking; the spiral‑fluted geometry and two cutting edges deliver stable chip evacuation and precise entry. Order the tool directly via Metav Werkzeuge or consult our specialists for tailored application advice.

RUKO Step Drill 4–30 mm (HSS‑Co5) — Spiral‑fluted, 14‑step drill with two cutting edges

A RUKO Step Drill 4–30 mm (HSS‑Co5) engineered for progressive hole enlargement in workshop and metalworking tasks, offering reliable step transitions and secure clamping for repeatable results

• HSS‑Co5 for enhanced heat resistance
• Spiral flutes for reliable chip evacuation
• 2 cutting edges with 118° point angle
• Shank with three flats for secure clamping

Reduce setup time with a single multi‑step tool

The 14 steps covering 4–30 mm allow progressive enlargement without frequent tool changes, which simplifies workflow and reduces downtime. Made from HSS‑Co5, the shaft combines high‑speed steel with 5% cobalt for improved wear resistance under elevated temperatures; this means fewer replacements and more consistent output. Using one multi‑step cutter instead of several twist drills consolidates the tooling inventory and speeds production sequences, particularly for batches of varying hole sizes.

Clean starts and consistent hole geometry for reliable assemblies

The combination of spiral flutes, a cross‑ground tip and two cutting edges with a 118° point angle promotes precise entry and balanced cutting forces. Spiral fluting improves chip evacuation, reducing built‑up edge and the risk of clogging when stepping through material. The cross‑ground geometry helps to centre the tool at the start of drilling, resulting in cleaner holes with predictable step transitions and less need for secondary deburring operations.

Secure mounting that preserves concentricity and tool life

A shank with three flats ensures secure clamping in standard chucks or holders and reduces slippage under load, helping to maintain concentricity through each step. Stable clamping reduces chatter and uneven wear, which in turn keeps hole tolerances tighter and extends service life. The robust mechanical fit is particularly beneficial for repetitive production tasks where consistent accuracy is required from the first to the last hole.

Built for durability and predictable workshop performance

The material choice and geometrical features combine to deliver durability and predictable performance in a workshop environment. The 90° step angle defines clear step transitions for accurate sizing, while the HSS‑Co5 composition enhances heat resistance, allowing sustained penetration without rapid softening. For workshops aiming to balance efficiency with quality, this step drill offers a pragmatic solution that reduces tool change cycles and maintains consistent hole quality across multiple operations.

Discuss the RUKO step drill and its suitability for specific applications with Metav Werkzeuge — our Emmerich team will advise on optimal use and supply options

Technical Data

• Article number: 4000601723NW
• Manufacturer: Ruko GmbH Präzisionswerkzeuge
• Packaging unit: 1

Facts

• Step range: 4–30 mm
• Number of steps: 14
• Point angle: 118°
• Step angle: 90°
• Cutting edges: 2
• Shank flats: 3

Special features

• Material: HSS‑Co5
• Flute: spiral‑fluted
• Tip: cross‑ground
• Design: step drill for progressive hole enlargement

FAQ

What hole sizes does this step drill cover?
The RUKO Step Drill 4–30 mm covers a continuous range from 4 mm up to 30 mm in 14 defined steps, enabling progressive enlargement without tool changes.

What does HSS‑Co5 mean for workshop use?
HSS‑Co5 indicates high‑speed steel with 5% cobalt; the RUKO tool benefits from enhanced heat resistance and wear performance compared with standard HSS.

How does the spiral flute affect performance?
Spiral flutes improve chip evacuation during stepping and reduce clogging, which helps to maintain cutting efficiency and hole quality throughout the 14 steps.

Why are three flats on the shank important?
The three flats facilitate secure clamping and reduce the risk of slip in the chuck, preserving concentricity and extending tool life under repetitive use.

Is the tip ground to prevent walking at start?
Yes, the RUKO step drill features a cross‑ground tip with a 118° point angle that aids accurate centring and reduces walking when beginning a hole.

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