CNGA 120408 Turning Inserts
Compare suitable materials and applications, then choose a brand to view the exact SKUs.
- ISO Code
- CNGA120408
- Insert Size
- 120408
- Shape
- C
Find the Right Option
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Brands
All available options for this parent model.
CNGA 120408 is an 80° rhombic turning insert with 4 usable cutting edges, used mainly for general turning and profiling. We list 8 stock-keeping variants of it from Achteck, covering Cast iron, Non-ferrous, Hardened steel.
The designation encodes the geometry: the first letter is the shape (C), the following letter the clearance angle, then the tolerance class, then size, thickness and nose radius. If you want to check any of it, our ISO insert code decoder breaks the full string down character by character.
Geometry and dimensions
| Insert family | CNGA |
|---|---|
| Category | Turning Inserts |
| Shape | 80° rhombic (C) |
| Usable cutting edges | 4 |
| Inscribed circle (IC) | 12.7 mm |
| Thickness (S) | 4.76 mm |
| Nose radius (RE) | 0.8 mm |
| Fixing hole diameter (D1) | 5.16 mm |
| Hand | Neutral |
| Variants in stock | 8 |
| Brands | Achteck |
Recommended cutting data
The figures below are the manufacturers' published ranges, aggregated across the 8 variants listed on this page. The typical column is the median, which is where most shops end up running. Treat the full range as the envelope, not a target — start around 60–70% of it and work up.
| Workpiece material | Cutting speed vc (m/min) | Typical vc | Feed fn (mm/rev) | Depth of cut ap (mm) | Variants with data |
|---|---|---|---|---|---|
| Cast iron (K) | 150 – 450 | 150 – 450 | 0.03–0.3 | — | 2 of 8 |
| Non-ferrous (N) | 300 – 600 | 300 – 600 | 0.03–0.2 | — | 1 of 8 |
| Hardened steel (H) | 90 – 180 | 120 – 180 | 0.03–0.3 | — | 5 of 8 |
To turn a cutting speed into a spindle speed for your actual diameter, use the cutting parameters calculator: n = vc × 1000 / (π × D).
Carbide grades available
8 variants of CNGA 120408 are stocked in these grades: PB30, PB60, PB90, PD20.
Across this range the grades specified most often are PB30, PB60, PB90, PD20. Within one brand's range, a higher middle digit usually means a tougher grade — better on interrupted cuts, slightly less wear resistant. See carbide grades explained for how to read the names.