5-12mm Step Drill HSS RUnaTEC Coated Spiral Fluted 2-Cut FLOWSTEP® Tip 118° 90° - Ruko GmbH

Take advantage of a combination of precision, durability and effortless operation: the RUKO ULTIMATECUT step drill delivers fast, low-force pilot holes thanks to its FLOWSTEP® tip and maintains performance with HSS substrate and RUNaTEC coating for extended service life. Order the bit directly via Metav Werkzeuge or contact our technical advisors for application guidance.

RUKO ULTIMATECUT Step Drill 5–12 mm – HSS, RUnaTEC-coated, FLOWSTEP® tip

The RUKO ULTIMATECUT is a multi-step drill bit designed for fast, accurate holes in hand-held power tools and for pinpoint centring on round workpieces such as pipes

• HSS with RUnaTEC coating
• FLOWSTEP® tip for fast pilot drilling
• Spiral flute and cross-ground cutting
• 3-flat shank prevents slipping

Faster pilot entry and smoother step transitions

The combination of a FLOWSTEP® tip and the stepped geometry produces exceptionally fast, low-force pilot drilling. The specially shaped tip gives pinpoint centring without the need for centre punching, even on curved surfaces such as tubing, which reduces set-up time and minimises damage to the workpiece. The seamless transition between diameters created by the FLOWSTEP® technology ensures a soft, continuous cut from one step to the next, therefore decreasing vibration and producing cleaner hole edges. These design choices translate directly into fewer tool changes and a more efficient workflow when using portable drilling equipment.

Robust cutting performance and extended tool life

Manufactured from high-speed steel (HSS) and finished with a RUNaTEC coating, the bit combines thermal resistance with improved wear properties. The two cutting edges and cross grind deliver reliable chip formation, while the spiral flute supports efficient chip evacuation to keep the cutting zone clear. The construction enhances hot hardness and wear resistance, which—according to the manufacturer—can result in up to two times more holes compared with uncoated or conventional designs. For workshops seeking reduced tooling downtime and predictable tool life, these characteristics represent a clear operational advantage.

Secure mounting and compatibility with hand-held tools

A 3-flat shank prevents the bit from rotating in the chuck, improving torque transmission and reducing the risk of slippage under load. Right-hand cutting and a point angle of 118° provide a balance between rapid penetration and controlled removal of material, while the 90° step angle standardises the step geometry for repeatable hole sizes. The bit is optimised for use in hand-held electric tools, so it suits maintenance, installation and general workshop tasks where mobility and quick changeover are priorities. The design supports a calm, controlled drilling action that feels easier and quieter during operation.

Practical results and improved hole quality

The spiral-nuted flute combined with the precise step geometry reduces burr formation and helps achieve cleaner hole edges across the available diameter range. The stepwise increments give immediate size options without the need to stop and change tools, and the continuous cutting profile helps avoid catches when entering or leaving the material. For applications where consistent hole quality and a reduced number of finishing operations are important, the step drill offers both a time-saving and quality-improving solution.

For reliable procurement and application advice on the RUKO ULTIMATECUT step drill, contact Metav Werkzeuge—our specialists will recommend the optimal variant and advise on compatibility with existing equipment; email info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: 4000865850NW
• Label: Stufenbohrer ULTIMATECUT 5–12 mm HSS RUnaTEC
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Diameter range: 5–12 mm
• Steps: 8
• Cutting edges: 2
• Point angle: 118°
• Step angle: 90°

Special features

• HSS material
• RUnaTEC coating
• Spiral flute (spiralgenutet)
• Cross-ground cutting (Kreuzanschliff)
• FLOWSTEP® tip on all steps
• 3-flat shank (3-Flächenschaft)
• Right-hand cutting
• Pinpoint centring without centre punch
• Optimised for hand-held electric tools
• Improved wear resistance and hot hardness
• Up to 2× more holes through extended life

FAQ

How does the FLOWSTEP® tip improve centring and pilot drilling?
The FLOWSTEP® tip creates a controlled pilot entry that enables pinpoint centring without centre punching; the RUKO ULTIMATECUT uses this geometry to reduce walking and allow fast, low-force starts even on round surfaces.

Which diameter sizes are covered by this step drill?
The bit covers a range from 5 to 12 mm across eight stepped diameters, providing multiple hole sizes in one tool.

Is the shank suitable for standard chucks in portable drills?
Yes, the 3-flat shank prevents slippage and is compatible with standard chucks commonly found on portable drilling equipment.

What advantages does the RUnaTEC coating provide?
RUNaTEC enhances wear resistance and hot hardness, helping to extend the service life and maintain cutting performance under thermal stress.

How many cutting edges does the bit have and what is their effect?
The step drill has two cutting edges with a cross grind; this creates efficient chip formation and smoother cutting action for improved hole quality.

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