Advantages of CNMG1204 steel turning inserts
In steel processing, the factory is most concerned about high cutting efficiency, long tool life, less tool change, and strong stability. At this time, a general turning insert with high cost performance and stable performance is particularly important.
This is exactly the strength of CNMG1204 turning insert.
It is widely used in rough processing and semi-finishing of Metal parts, and is a “standing tool” in many processing workshops.
What is turning insert CNMG1204?
CNMG is a standard negative rake angle indexable insert with a stable structure and strong versatility, which is very suitable for turning Metal parts. Let’s quickly analyze its meaning:
C: Diamond 80° insert, good rigidity, suitable for heavy-duty processing
N: 0° back angle, large support surface, suitable for rough to semi-finishing
M: Medium tolerance grade
G: Double-sided through-hole design, support double-sided use
1204: side length 12mm, thickness 4.76mm, common tip radius 0.4mm, 0.8mm
This insert has a stable structure and uniform cutting force, and performs particularly well in Metal processing.
CNMG1204 Three major advantages in processing steel parts
Strong rigid structure, strong stability
CNMG Turning insert adopt 0° back angle design, with 80° large cutting edge angle, strong rigidity, not easy to break, even in heavy load or intermittent processing can maintain good cutting state.
Excellent chip breaking, smooth chip removal
Common problems in Metal processing are chip curling and winding. The chip breaker design of CNMG1204-MP, GP, etc. can quickly break the chips and effectively discharge them, keeping the processing clean and smooth, and reducing the risk of surface damage to the workpiece.
High cost performance, 6 cutting edges are more durable
A CNMG1204 blade has 6 usable cutting edges, which can be used on both sides, greatly reducing the cost of a single edge. For users of medium to large batch processing, it is extremely cost-effective.
Comparison of CNMG with other common blades (TNMG/SNMG/DNMG)
| Comparison Items | CNMG1204 | TNMG1604 | SNMG1204 |
| Blade Angle | 80° diamond shape, strong rigidity, 6 cutting edges | 60° triangle, high flexibility, 6 blade tips | 90° square, maximum rigidity, 8 tips |
| Suitable for processing materials | Steel, cast iron, alloy steel | Steel, cast iron, stainless steel (light load) | Cast iron, stainless steel (heavy load) |
| Finishing performance | good | better | generally |
| Processing characteristics | Stable and versatile, suitable for continuous or intermittent cutting | Flexible and suitable for small parts | Suitable for rough machining and interrupted cutting |
CNMG combines rigidity and versatility in Metal processing and is an excellent representative of stability and cost-effectiveness.
Which steels are suitable for Turning insert CNMG1204?
| Material Type | Recommended | Recommended geometries/coatings |
| Ordinary carbon steel (Q235, etc.) | ✅ Highly recommended | MP / GP + CVD Coating |
| Alloy steel (40Cr, etc.) | ✅ | MP / MS + TiCN+Al2O3 |
| Shaft steel (20CrMnTi) | ✅ | GP / MS |
| Carburizing steel, quenched and tempered steel | ✅ | PVDNano coating + negative rake angle design |
| Stainless steel (304, etc.) | ⚠ Available | MA groove type (but not as stable as SNMG) |
| cast iron | ✅ | HK geometry, stable chip breaking |
Summary: Why choose turning insert CNMG1204 for steel processing?
Strong versatility, suitable for a variety of steels
Good rigidity, suitable for medium and heavy cutting
Smooth chip removal, not easy to stick to the knife
Advanced coating, longer life
Reasonable cost, high cost performance
