15mm Countersink 90° HSS, RUnaTEC Coating, 4-Flute, 3-Shank Flats, Right-Hand Cutting - Ruko GmbH

Achieve faster, quieter countersinking with significantly reduced feed force thanks to the combination of HSS construction and RunaTEC coating; expect up to 50% faster operation and up to 3x more countersinks before tool change. Order the ULTIMATECUT 4S directly via Metav Werkzeuge or ask our consultants if needed.

RUKO ULTIMATECUT 4S 15 mm HSS 90° countersink (4-flute, RUnaTEC-coated)

The RUKO ULTIMATECUT 4S is a 90° countersink engineered for efficient manual and stationary countersinking in steel, delivering consistent finish and reduced operator effort.

• RUnaTEC coating for extended tool life
• 4-flute geometry for smooth, quiet operation
• 90° angle for standard countersinking
• Shank with 3 flats for secure clamping

Faster production and lower machining effort

The ULTIMATECUT 4S is built to increase throughput: the combination of HSS substrate and RunaTEC coating reduces friction and wear, meaning significantly less feed force is required during countersinking. In practice this translates to up to 50% faster cycle times and the possibility of achieving up to 3x more countersinks before replacement, which benefits both line production and small-batch workshop work. The specified feed in steel up to 800 N: 0.16 mm/rev offers a clear, measurable guideline for setting machining parameters to exploit the tool’s efficiency.

Consistent countersink finish with minimal vibration

The four-flute geometry and optimised cutting geometry ensure an optimal sink finish without chatter marks, even under mixed manual and machine conditions. The design promotes an extremely quiet run, reducing noise and vibration while improving surface quality around the hole rim. The standard 90° countersink angle produces predictable chamfers for common fastening applications, making this tool suitable for workshops aiming for repeatable, high-quality results with fewer reworks.

Robust clamping and workshop-ready durability

Designed for secure holding, the tool features a shank with 3 flats to prevent slippage in chucks and holders. The tool’s right-hand cutting direction and compliance with DIN 335 C ensure compatibility with conventional countersinking setups. Thanks to the RunaTEC coating, tool life is extended and maintenance intervals are lengthened, which reduces downtime and tool-change frequency. These properties make the countersink an economical choice for both individual tradespeople and production environments seeking dependable performance.

Discuss selection of the RUKO ULTIMATECUT 4S with Metav Werkzeuge’s specialists for tailored recommendations and practical application advice — contact info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• SKU: 4000605551NW
• Item: RUKO ULTIMATECUT 4S countersink, 15 mm, 90°
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• UID: 4000605551NW

Core data

• Diameter: 15 mm
• Countersink angle: 90°
• Flutes: 4
• Feed in steel (up to 800 N): 0.16 mm/rev

Special features

• Material: HSS
• Coating: RUnaTEC-coated
• Standard: DIN 335 C
• Cutting direction: right-hand
• Shank: with 3 flats
• Designed for stationary and manual use
• Reduced feed force required
• Up to 3x more countersinks vs. standard tools
• Up to 50% faster countersinking
• Extremely quiet run
• Optimal countersink finish without chatter marks

FAQ

What material is the countersink made from?
The RUKO ULTIMATECUT 4S is manufactured from HSS, providing toughness and temperature resistance suitable for workshop and production use.

What coating does the tool use and what is its benefit?
The tool features a RunaTEC coating, which reduces friction and wear to extend tool life and permit higher productive feeds.

Which standard and geometry does the countersink follow?
The countersink conforms to DIN 335 C, with a 90° angle and a 4-flute geometry for a balanced finish.

What feed rate is recommended for steel?
For steel under loads up to 800 N, a feed of 0.16 mm/rev is indicated as the machining guideline for consistent results.

Is the shank suitable for secure clamping?
Yes — the shank is supplied with 3 flats to ensure reliable clamping in collets and chucks during both manual and machine operations.

Metav IndustryLine: Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com