The Carbide Insert CNMG 120408 is one of the most widely used indexable turning inserts for external and internal CNC turning. With its 80° diamond shape, negative rake, and double-sided design, CNMG 120408 offers excellent edge strength, stable cutting performance, and low cost per edge.
This insert is an ideal choice for roughing and semi-finishing operations in steel, stainless steel, and cast iron machining.
Key Specifications
Insert Type: CNMG
ISO Size: 120408
Shape: 80° Diamond (C-type)
Relief Angle: 0° (Negative)
Tolerance: M
Chipbreaker: Optional (roughing / semi-finishing / finishing)
Coating Options: CVD / PVD
Application: CNC turning
Advantages
High Edge Strength
The negative rake geometry provides excellent resistance to heavy cutting loads, interrupted cuts, and vibration during machining.
Double-Sided with 8 Cutting Edges
Each CNMG 120408 insert offers 8 usable cutting edges, significantly reducing tooling cost per part.
Stable and Consistent Performance
CNMG inserts are well known for their predictable tool life, smooth chip evacuation with proper chipbreaker, and reliable surface finish in semi-finishing operations.
Suitable Workpiece Materials
CNMG 120408 carbide inserts are suitable for machining carbon steel (ISO P), alloy steel, stainless steel (ISO M), and cast iron (ISO K). Different grades and coatings are available to match specific materials and cutting conditions.
Typical Applications
CNC lathes and turning centers, automotive components, shafts, flanges, and general turned parts. Heavy-duty roughing and semi-finishing. CNMG 120408 is especially popular in batch production and industrial machining environments.
Recommended Cutting Parameters
| Operation |
Cutting Speed (Vc) |
Feed (f) |
Depth of Cut (ap) |
| Roughing |
120-220 m/min |
0.25-0.45 mm/rev |
2.0-6.0 mm |
| Semi-Finishing |
150-260 m/min |
0.15-0.30 mm/rev |
0.5-3.0 mm |
Actual cutting data depends on workpiece material, insert grade, coating, and machine rigidity.
Available Grades & Coatings
We supply CNMG 120408 inserts with CVD coatings (TiCN + Al2O3 + TiN) for long tool life, PVD coatings (TiAlN / AlTiN) for sharp edges and versatility, and fine-grain carbide substrates for improved toughness. Custom chipbreakers and grades are available upon request.
Why Choose Our CNMG 120408 Inserts?
As a professional carbide cutting insert manufacturer and exporter, we offer stable and consistent quality, competitive factory pricing, OEM & private label support, bulk order supply capability, and fast response with technical support. Our CNMG inserts are widely used as cost-effective alternatives to major international brands.
Request Samples or Bulk Pricing
If you are sourcing Carbide Insert CNMG 120408 for CNC turning, we welcome your inquiry.
SUPPORT: Request samples, get technical recommendations, receive bulk pricing, discuss long-term cooperation. Fast response guaranteed.
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