CNMG-MA turning insert

CNMG120404A-MA Carbide Turning Inserts: High-Performance Solution for Precision Machining

Introduction

In today’s competitive manufacturing landscape, productivity, precision, and cost efficiency are critical factors. Cutting tools play a decisive role in achieving these targets, and carbide inserts have become indispensable in modern machining due to their durability and versatility.

One of the most widely used inserts in turning operations is the CNMG120404A-MA carbide insert, designed for high-performance cutting across steel, stainless steel, and cast iron. As a carbide insert manufacturer with over 33 years of expertise, we produce advanced solutions that combine high-quality substrates, innovative coatings, and optimized chip breakers to help industries maximize efficiency.

This article will provide a complete overview of CNMG120404A-MA inserts—covering their advantages, code meaning, dimensional parameters, applications, features, precautions, and technology innovations.

What Does CNMG120404A-MA Mean?

The naming code of a carbide insert follows ISO/ANSI standards. Each letter and number identifies a feature of the insert’s geometry and function.

C – Insert Shape: 80° diamond (rhombic). Offers strong cutting edges, widely used in roughing and finishing.

N – Relief Angle: 0° (neutral clearance). Provides maximum insert strength and enables double-sided use.

M – Tolerance Class: Medium accuracy. Suitable for most turning applications requiring balance of precision and economy.

G – Hole Type: With chip groove and fixing hole for secure clamping.

12 – Insert Size: 12.7 mm inscribed circle (IC).

04 – Thickness: 4.76 mm.

04 – Corner Radius: 0.4 mm, ideal for finishing and semi-finishing.

A – Special edge preparation or chipbreaker variant. Designed for improved chip control and reduced cutting resistance.

MA – Chipbreaker Style: Medium Application. Optimized for balanced performance in semi-finishing of steels and stainless steels.

In summary:
The CNMG120404A-MA is an 80° diamond-shaped carbide insert, double-sided, medium-tolerance, with a 0.4 mm radius, featuring an MA chipbreaker designed for semi-finishing of steels.

Advantages of CNMG120404A-MA Inserts

1. Superior Tool Life

Manufactured from premium tungsten carbide substrates, this insert ensures excellent hardness, toughness, and resistance to wear and deformation.

2. Advanced Coating Technology

CVD or PVD coatings such as TiCN, Al2O3, and TiAlN provide heat resistance, oxidation resistance, and reduced friction, enabling higher cutting speeds.

3. Double-Sided Economy

With a 0° clearance design, each insert offers four cutting edges per side, totaling eight usable edges. This dramatically reduces cost per part.

4. Balanced Geometry

The 80° diamond shape offers strong edges with wide versatility. Combined with a 0.4 mm corner radius, it ensures high surface finish and precision.

5. Optimized Chipbreaker (MA)

The MA chipbreaker provides smooth chip evacuation in both continuous and interrupted cuts, avoiding built-up edges and minimizing vibration.

Technical Parameters of CNMG120404A-MA

Applications and Use Cases

The CNMG120404A-MA insert is versatile, finding applications in multiple industries:

Automotive: Turning crankshafts, transmission shafts, brake discs, and gears.

Aerospace: Semi-finishing of stainless steel housings, turbine rings, and landing gear components.

Energy: Oil & gas valves, pump housings, and precision connectors.

General Engineering: Steel bars, pipes, fasteners, and precision fittings.

Heavy Machinery: Machining cast iron and alloy steel parts for construction and mining equipment.

Role and Function in Machining

Semi-Finishing: With a 0.4 mm corner radius, the insert is perfect for operations requiring both accuracy and durability.

Surface Quality: Achieves smooth finishes (Ra 1.6–3.2 µm).

Chip Control: The MA chipbreaker ensures reliable chip breaking in medium cutting conditions.

Efficiency: Capable of high cutting speeds and feed rates, reducing cycle times.

Key Features of CNMG120404A-MA

High Precision & Stability – Medium tolerance ensures dimensional accuracy.

Strong Edge Strength – The neutral clearance angle and 80° design enhance insert robustness.

Excellent Chip Evacuation – MA breaker reduces tool wear and improves cutting stability.

Cost-Efficient Productivity – Double-sided insert design provides maximum edge utilization.

Material Versatility – Suitable for steels, stainless steels, and cast iron.

Usage Precautions

To maximize performance:

Cutting Speed (Vc): 150–300 m/min depending on work material.

Feed Rate (f): 0.1–0.3 mm/rev for finishing, 0.25–0.5 mm/rev for semi-finishing.

Depth of Cut (ap): 0.2–3 mm depending on operation.

Coolant: Use coolant when machining stainless steel to reduce heat and avoid built-up edges.

Tool Clamping: Ensure rigid setup to prevent vibration.

Edge Usage: Rotate to a new edge before severe wear occurs to maximize productivity.

Technological Innovations & Patents

As a hard alloy insert manufacturer, we integrate:

Nano-Coating Layers – TiAlN and AlTiN nano-coatings for oxidation resistance.

Gradient Substrate – Core toughness with a hard outer surface, balancing durability and hardness.

Chipbreaker Optimization (MA) – Proprietary groove geometry ensuring consistent chip breaking.

Edge Honing Technology – Improves resistance to micro-chipping and prolongs tool life.

Eco-Friendly Manufacturing – Advanced sintering and coating methods with reduced emissions.

Why Choose Our CNMG120404A-MA Inserts?

33 Years of Experience in carbide tool manufacturing.

OEM/ODM Capabilities for customized insert solutions.

ISO-Certified Quality with strict inspection standards.

Global Export Network trusted in over 40 countries.

Factory-Direct Pricing with uncompromised quality.

Conclusion

The CNMG120404A-MA carbide insert is a robust, efficient, and economical solution for precision turning. With its 80° diamond shape, double-sided design, MA chipbreaker, and advanced coatings, it ensures:

Longer tool life

Stable machining performance

Excellent chip control

High-quality surface finish

Reduced machining costs

Whether in automotive, aerospace, energy, or general machining, this insert guarantees consistent results, making it a top choice for manufacturers seeking performance and reliability.