6.5-40.5mm HSS Step Drill Spiral Flute 2 Cutting Edges 118° Point 90° Step Angle - Ruko GmbH

Take advantage of durable, high-performance drilling with a tool that combines high-speed steel construction, spiral flute chip evacuation and an 11-step range for fewer tool changes; order the part directly via Metav Werkzeuge or consult the Metav team for application advice.

RUKO Step Drill Bit 6.5–40.5 mm – HSS, spiral flute, 11 steps

The RUKO Step Drill Bit 6.5–40.5 mm is a stepped drill designed for fast, accurate holemaking and enlarging in metric cable gland applications and thin sheet materials

• High-speed steel construction
• Spiral flute for efficient chip removal
• 118° split point for fast centring
• Shank with three flats for secure clamping

Consistent hole sizes with fewer tool changes

The stepped geometry delivers a continuous diameter progression from 6.5–40.5 mm, allowing progressive enlargement without repeated tool swaps. This results in a more efficient workflow and reduced setup time in production or workshop environments. The eleven-step profile, specified as 11 steps, maintains concentricity across the drilling process, which is especially valuable when preparing holes for metric cable glands, where diameter accuracy and edge quality influence sealing and thread engagement.

Faster centring and improved start behaviour

A 118° split point with cross-ground geometry ensures reliable self-centring and reduces wandering on thin or coated materials. The cross grind refines the cutting edges to lower feed forces and avoid tear-out at hole entry, so centre-punching is often unnecessary. Combined with the spiral flute, which promotes continuous chip transport away from the cutting zone, the design supports sustained cutting at moderate feeds and mitigates heat build-up that can blunt edges prematurely.

Secure clamping and predictable performance

The shank with three flats provides positive gripping in chucks and collets, minimising slippage during high-torque operations. Constructed from high-speed steel (HSS), the bit balances toughness and hardness for general-purpose cutting in sheet metals and related materials. The tool’s two cutting edges are optimised for smooth diameter transitions; this reduces rework and improves repeatability when multiple holes of differing sizes are required in the same component.

Practical handling and maintenance for the workshop

Routine reconditioning is straightforward: light sharpening of the cutting lips will restore the split point geometry without complex regrinding. The spiral-fluted design aids visual chip inspection, enabling quick assessment of tool condition during use. Supplied as a single unit (packaging unit 1), this stepped drill is a compact solution for maintenance departments and fabrication shops seeking an economical way to cover a broad hole-size spectrum without a set of individual drills.

For reliable supply and tailored advice on the RUKO step drill bit, contact Metav Werkzeuge in Emmerich — Metav’s specialists can confirm suitability for specific applications and arrange delivery from stock; email info@metav-werkzeuge.com or call +49 2822 7131930

Technical Data

• Article number: 4000601761NW
• Packaging unit: 1
• Manufacturer: Ruko GmbH

Core specifications

• Diameter range: 6.5–40.5 mm
• Number of steps: 11
• Point angle: 118°
• Step angle: 90°
• Cutting edges: 2
• Shank: 3 flats

Materials & features

• Material: high-speed steel (HSS)
• Spiral flute
• Cross-ground (split) point
• Intended for metric cable gland holes
• Two cutting edges for smooth step transitions

FAQ

What diameter range does this stepped drill cover? The RUKO step drill bit covers a diameter range of 6.5–40.5 mm (SKU 4000601761NW) and increments through eleven predefined steps for progressive hole enlargement.

Is the bit suitable for quick centring on thin sheet material? Yes, the 118° split point and cross-ground geometry on the RUKO stepped bit deliver fast centring and reduced walking on thin or coated sheets.

How is chip evacuation handled with this tool? The spiral flute design directs chips away from the cutting zone, improving chip control and reducing heat accumulation during drilling.

Can the shank be gripped securely in standard chucks? The shank with three flats provides a positive grip in chucks and collets, lowering the risk of slippage under load when using the RUKO step drill bit.

Which material is the tool made from and what does that mean for durability? Made from high-speed steel (HSS), the tool offers a balance of toughness and edge retention suitable for general workshop tasks and repeated use.

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