SDMT 120408 Milling Inserts
Compare suitable materials and applications, then choose a brand to view the exact SKUs.
- ISO Code
- SDMT120408
- Insert Size
- 120408
- Shape
- S — Square
- Radius
- 0.8 mm
- Thickness
- 4.76 mm
- d / IC
- 12.7 mm
- Relief Angle
- 15°
Find the Right Option
Select the workpiece material and application. Brand remains optional.
Brands
All available options for this parent model.
SDMT 120408 is a square 90° milling insert with 8 usable cutting edges, used mainly for heavy roughing, square shoulders and interrupted cuts. We list 17 stock-keeping variants of it from Achteck, covering Steel, Stainless steel, Cast iron, Heat-resistant alloys.
Milling inserts are chosen to match the cutter body — lead angle, number of teeth and the geometry designated by the manufacturer. The milling insert selection guide walks through that; this page lists what we actually hold in SDMT 120408.
Geometry and dimensions
| Insert family | SDMT |
|---|---|
| Category | Milling Inserts |
| Shape | square 90° (S) |
| Usable cutting edges | 8 |
| Inscribed circle (IC) | 12.7 mm |
| Thickness (S) | 4.76 mm |
| Nose radius (RE) | 0.8 mm |
| Cutting edge length (L) | 11.1 mm |
| Fixing hole diameter (D1) | 4.4–5.5 mm (typically 4.4 mm) |
| Hand | Neutral |
| Variants in stock | 17 |
| Brands | Achteck |
Cutting data
The 17 variants of SDMT 120408 listed here are supplied without a full published cutting-data set, so we do not publish one. Ask us for the specific grade and chipbreaker you are considering and we will send the manufacturer's window for it.
Carbide grades available
17 variants of SDMT 120408 are stocked in these grades: AP251K, AP251U, AP403M, AC251P, AC151K, AP351M, AC301K, AP351U.
Across this range the grades specified most often are AP251K, AP251U, AP403M, AC251P, AC151K. 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.
Chipbreaker geometries
Chipbreakers stocked for SDMT 120408: MM4, MR2.
For milling, the geometry code marks the intended duty — sharper for light cuts and better finish, stronger for scale and interruption. Milling insert selection guide.
Typical applications
- Face milling
- Chamfer milling
- Slot milling
- Ramp milling
- Helical interpolation
- Plunge milling
- Pocket milling
For more on cutting steel, see our material-specific guide.