Advantages of CNMG120404-HK turning insert for machining cast iron
In the metalworking industry, cast iron is a common but difficult material. usually machined on a lathe using a turning insert.
It is hard, brittle, and easy to break, which places higher demands on the blade. Among the many turning blade models, CNMG120404-HK has become a popular choice for machining cast iron due to its excellent performance.
What is CNMG120404-HK?
CNMG120404-HK is a standard indexable carbide turning insert with a diamond design and 4 available cutting edges (double-sided design), which is very suitable for external turning, end turning and other processes.
C: Diamond insert, angle of 80°, high strength
N: No back angle (0°), good rigidity, suitable for rough machining
M: Medium precision grade
G: With hole + double-sided grinding
120404: Indicates size – 12mm side length, 4.76mm thickness, 0.4mm radius
HK: Represents chip breaker designed for cast iron machining (H), and moderate cutting load (K)
The core advantages of turning insert CNMG120404-HK
1. High wear resistance, specially made for cast iron
Cast iron contains graphite particles, which are highly abrasive, and ordinary blades tend to wear out quickly.
The CNMG120404-HK we selected is made of fine-grained cemented carbide, with a Vickers hardness of HV 1800–2000, and with a CVD double-layer coating (such as TiCN + Al₂O₃), it effectively improves wear resistance
2. Strong versatility and good adaptability
The 80° diamond structure has higher edge strength and is compatible with a variety of tool bar models. There is no need to change the tool system, making tool change more convenient.
Whether it is an outer circle, end face, or rough machining or semi-finishing, it can handle it with ease.
3. Multi-tip design to reduce the cost of use
CNMG120404-HK has two sides and four tips, and each blade can be used 4 times (or more). It has great advantages in processing cost control and is particularly suitable for mass production
Which one is better for you, TNMG or CNMG lathe insert?
We often receive questions from customers: “I am using TNMG, why should I switch to CNMG?”
In short:
| type | insert shape | Available tip | rigidity | Suitable for processing objects |
| TNMG | Equilateral triangle | 6个 | Slightly weak rigidity | Often used for light loads, fine machining or softer materials |
| CNMG | Rhombus 80° angle | 4个 | Stronger rigidity | More suitable for heavy load, intermittent turning, and cast iron processing |
If you are looking for a turning insert suitable for efficient processing of cast iron, CNMG120404-HK is a choice that will not disappoint you.
It has been widely adopted by many machinery factories and foundries, and has performed well in actual use.
Puwei Cemented Carbide Co., Ltd. commits to producing, researching and developing, and selling turning inserts and CNC tools. If you feel interested, please contact us.
