4-30mm Step Drill HSS Spiral Flute 2-Cut 72mm Overall Length 118° Point 90° Step Angle - Ruko GmbH

Take advantage of fast, controlled step drilling with a compact HSS design and spiral flute for reliable chip evacuation; the short 72 mm overall length and shaft with three flats ensure secure clamping in panel and control-cabinet work. Order directly via Metav Werkzeuge or contact our consultants for application advice.

RUKO Step Drill Bit 4–30 mm – HSS, spiral flute, 72 mm overall length

The RUKO Step Drill Bit 4–30 mm is a compact HSS step drill designed for clean hole enlargement in thin sheet and control-cabinet panels, offering precise, burr-reduced steps for rapid panel fabrication and electrical enclosure work

• HSS with spiral flute
• 4–30 mm step range
• Overall length 72 mm
• Two cutting edges, CBN-ground
• Shaft with 3 flats for secure clamping

Consistent, fast step drilling for panel and cabinet work

The combination of HSS material and a spiral flute enables continuous chip evacuation and stable cutting when enlarging holes in thin metal panels. The tool’s short design with a 72 mm overall length provides improved accessibility in confined assemblies, while the two cutting edges and CBN-ground finish ensure sharp, repeatable steps. The point geometry complies with DIN 1412‑C, giving a reliable entry and reduced wandering on flat sheets. These characteristics translate into measurable time savings for series work on control cabinets and electrical enclosures.

Cleaner holes and precise step geometry for fewer reworks

A 118° point angle and 90° step angle produce well-defined, concentric steps across the 4–30 mm range, reducing the need for subsequent deburring. The CBN grinding enhances flank sharpness and prolongs service life, maintaining consistent step diameters over longer runs. The spiral flute design assists in removing chips from each step quickly, which minimises heat build-up and prevents clogging that can otherwise blemish hole edges. For production environments where throughput and repeatability matter, these properties deliver clear quality advantages.

Secure clamping and easy integration into workshop processes

The shaft with 3 flats provides a positive grip in chucks and quick-change holders, making the tool suitable for compact drilling setups typical in panel building. The short overall length and robust HSS construction ensure controlled drilling even in handheld or limited-fixture scenarios. Maintenance is straightforward: the CBN-ground cutting surfaces retain their edge longer than conventional grinds, reducing downtime for resharpening. For installations up to 2.0 mm panel thickness this configuration combines operational ease with dependable durability.

For precision panel work, select the RUKO step drill and contact Metav Werkzeuge for tailored advice and reliable supply from Emmerich – phone +49 2822 7131930 or email info@metav-werkzeuge.com

Technical Data

• Article number: 4000601754NW
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• Label: Stufenbohrer 4–30 mm HSS, spiral flute, overall L. 72 mm

Key measurements

• Step range: 4–30 mm
• Overall length: 72 mm
• Steps: 14
• Cutting edges: 2
• Point angle: 118°
• Step angle: 90°
• Suitable panel thickness: up to 2.0 mm

Design & special features

• HSS material
• Spiral flute
• CBN-ground cutting edges
• Cross grind (Kreuzanschliff)
• Short version
• Point per DIN 1412‑C
• Shaft with 3 flats

FAQ

Which materials can be processed with this step drill? The RUKO step drill bit is intended primarily for thin sheet metal and panel work such as in control-cabinet construction; its HSS geometry is optimised for these applications and for sheet thicknesses up to 2.0 mm.

Is the bit suitable for use in a handheld drill or only in a press? The short overall length and the shaft with three flats make the RUKO step drill suitable for handheld drills and compact drilling setups, though steady clamping or a drill press is recommended for highest precision.

How is chip evacuation improved compared with straight-flute designs? The spiral flute profile promotes continuous chip removal from each step diameter, reducing clogging and heat build-up and yielding cleaner hole edges than straight-flute alternatives.

What maintenance ensures the longest service life? The CBN-ground cutting edges retain sharpness longer; routine cleaning of flutes and avoiding excessive feed at high speeds will extend life and preserve step accuracy.

What mounting options are recommended for secure clamping? Use a chuck or quick-change holder that engages the shaft’s three flats to prevent slip and to maintain concentricity during drilling.

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