40mm Countersink, 90° Angle, HSS Runatec-Coated, 4-Flute, Right-Hand Shank With Three Flats, For Steel, High-Performance - Ruko GmbH

Take advantage of the combination of HSS construction and RUnaTEC coating for extended tool life and significantly faster countersinking cycles; ideal for both stationary machines and hand-held use. Order the tool directly via Metav Werkzeuge or consult the technical advisors for application-specific guidance.

ULTIMATECUT 4S — 90° conical countersink, 40 mm, HSS, RUnaTEC-coated (RUKO)

The ULTIMATECUT 4S is a 90° conical countersink designed for high-performance countersinking in steel, suited to both stationary and manual operations.

• HSS material with RUnaTEC coating
• 90° angle for standard countersinking
• 4 flutes for fast chip evacuation
• Shank with three flats for secure clamping

Faster, cleaner countersinking through optimised geometry

The tool combines a 90° conical profile with a 4 flutes configuration to reduce cutting forces and improve chip flow. The high-speed steel core provides toughness under load, while the RUnaTEC coating lowers friction and increases wear resistance; as a result, countersinking cycles run up to 50% faster and allow for up to three times the number of holes between tool changes. For workshop managers and production engineers, this translates into measurable throughput gains and fewer tool changes per shift.

Low feed force and smooth running for manual and stationary use

Designed for both fixed spindles and hand tools, the countersink requires significantly less feed force thanks to its cutting geometry. The shank with three flats ensures reliable clamping in chucks and collets, reducing slippage during hand-held operations. The combination of material and coating delivers an extremely smooth run, reducing vibration and preventing chatter marks so that the resulting countersink edge presents a consistently optimal finish.

Practical parameters and application guidance

This countersink is specified to operate effectively in steel with a recommended feed of 0.25 mm/rev at loads up to 800 N; these parameters balance material removal rate with surface quality. The tool is right-hand cutting, compatible with common machine setups, and conforms to DIN 335 C, making it straightforward to integrate into existing production processes. For teams introducing the tool to new materials or machining conditions, the documented feed guidance affords a reliable starting point.

Durable construction for reduced downtime

Built from high-speed steel and finished with a low-friction surface treatment, the design prioritises longevity under continuous use. The robust construction and coating combination reduce wear rates and keep maintenance intervals predictable. In practice, workshops benefit from fewer interruptions, lower tooling consumption and a steadier production rhythm — advantages that support cost-efficiency without compromising component quality.

Contact Metav Werkzeuge today for stock availability and tailored application advice based on workshop requirements, delivered from Emmerich with industry-proven consultation.

Technical Data

• Article number: 4000605558NW
• Manufacturer: Ruko GmbH
• Packaging unit: 1

Facts

• Diameter: 40 mm
• Countersink angle: 90°
• Number of flutes: 4
• Standard: DIN 335 C
• Feed in steel (≤800 N): 0.25 mm/rev

Special features

• Material: HSS
• Coating: RUnaTEC
• Shank: with 3 flats
• Cutting direction: right-hand cutting
• Fits stationary and manual machines
• Reduced feed force required
• Up to 3× more countersinks; up to 50% faster

FAQ

Is this countersink suitable for steel workpieces?
Yes. The ULTIMATECUT 4S is specified for steel applications and the feed guidance of 0.25 mm/rev at loads up to 800 N provides a reliable machining starting point.

What clamping method is recommended for the tool?
The shank with three flats ensures secure clamping in chucks and collets, making it suitable for both stationary spindles and manual holders when using proper collets or chucks.

Does the RUnaTEC coating significantly extend service life?
The RUnaTEC coating reduces friction and wear; combined with the HSS core, it contributes to longer tool life and more countersinks between regrinds or replacements.

Which standard does the tool conform to and what is the SKU?
The tool conforms to DIN 335 C and is listed under SKU 4000605558NW for ordering and identification.

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