CNMG 120412 T5115 Wendeplatten - Tungaloy

Take advantage of the combination of a CVD-coated carbide grade designed for cast iron and an ISO‑standard rhombic form that ensures predictable holder compatibility; this reduces tool changes and supports steady productivity. Order the insert directly via Metav Werkzeuge or ask our consultants for matching holders and cutting data.

CNMG 120412 T5115 turning insert by Tungaloy — CVD‑coated carbide for cast iron

CNMG120412 T5115 is an ISO‑standard rhombic indexable insert intended for external and internal turning applications, optimised as a universal grade for cast iron machining.

• CVD-coated carbide for durability
• Universal grade for cast iron
• ISO CNMG120412 rhombic insert
• Double-sided chipbreaker, with cylindrical hole

Consistent wear resistance for cast iron that keeps production running

The CVD‑coated carbide composition of this grade delivers a balanced performance between wear resistance and edge stability, which is particularly important when machining cast iron. A CVD (chemical vapour deposition) coating forms a thin, hard layer that resists abrasive wear and helps maintain the cutting edge at elevated temperatures. For manufacturers focused on repeatable throughput, the result is fewer insert changes and more consistent component quality. When selecting an insert for cast iron, prioritising a grade that combines a robust substrate with a protective coating reduces risk of premature flank wear and supports longer tool life.

Predictable fit and simplified toolholder selection

This insert follows the ISO specification for CNMG120412 size and form, which means compatibility with holders is determined by geometry: shape, clearance (relief) angle, tolerance class, fastening method, size and thickness. The rhombic form with an 80° included angle and a 0° relief angle is a common configuration for turning holders; matching the holder’s pocket and clamp ensures secure seating and repeatable positioning. The insert’s cylindrical centre hole supports standard screw or clamp systems. Choosing a correctly matched holder avoids chatter and positional errors, improving surface finish and dimensional control without needing bespoke clamping solutions.

Design choices that reduce downtime and improve surface quality

The insert is double‑sided, offering two cutting edges per indexed position and efficient cost‑per‑edge usage. A corner radius of 1.2 mm provides a compromise between edge strength and achievable surface finish: a larger radius increases edge robustness for interrupted cuts, while still permitting good finish on stable setups. The 4.76 mm thickness contributes to rigidity in the clamped assembly. The integrated double‑sided chipbreaker helps control chip formation when turning cast iron, reducing the risk of long, entangling swarf and improving evacuation. For best results, match chipbreaker geometry and grade to the specific workpiece stability and machining strategy.

Contact Metav Werkzeuge to confirm holder compatibility and to specify the Tungaloy T5115 grade for cast iron turning applications

Technical data

• Article number: 6850138
• SKU: 6850138-Tungaloy
• Manufacturer SKU: TUN6850138
• Type: ISO indexable turning insert CNMG

Facts

• Size: 12 mm
• Thickness: 4.76 mm
• Corner radius: 1.2 mm
• Relief angle: 0°
• Included angle: 80°

Special features

• Material: carbide
• Coating: CVD
• Grade: T5115
• Shape: rhombic
• Hole: cylindrical hole
• Chipbreaker: double-sided
• Application: external and internal turning

FAQ

Which materials is this insert designed for?
The T5115 grade is a universal grade optimised for cast iron; the CNMG120412 insert by Tungaloy is specified for reliable performance when turning various types of cast iron.

What are the key geometric specifications to check for holder compatibility?
Check form (rhombic CNMG), clearance (0° relief), size (12 mm), thickness (4.76 mm) and fastening (cylindrical centre hole); these dimensions determine correct fit in an ISO‑compatible holder.

Is the insert reversible and how does that affect cost efficiency?
Yes, the insert is double‑sided with a double‑sided chipbreaker, offering multiple cutting edges and reducing cost per usable edge compared with single‑sided inserts.

What benefits does the CVD coating provide in everyday machining?
The CVD coating on this carbide grade enhances abrasive wear resistance and thermal stability, which helps maintain edge life and consistent machining results in cast iron operations.

For which turning tasks is a 1.2 mm corner radius most suitable?
A 1.2 mm corner radius combines edge strength for interrupted or semi‑roughing cuts with the ability to deliver a good surface finish on stable set‑ups, making it a versatile choice for mixed turning tasks.

Manufacturer/Responsible: Tungaloy-NTK Germany GmbH, Katzbergstraße 3a, 40764 Langenfeld - Protected trademarks and product names are the property of their respective owners. Brand names and protected trademarks are mentioned solely for explanatory purposes. There is no affiliation between our company and the mentioned brands. The item offered is an original, brand-new product from the manufacturer.