SDMT 120420 Milling Inserts
Compare suitable materials and applications, then choose a brand to view the exact SKUs.
- ISO Code
- SDMT120420
- Insert Size
- 120420
- Shape
- S
Find the Right Option
Select the workpiece material and application. Brand remains optional.
Brands
All available options for this parent model.
A square 90° milling insert with 8 cutting edges, SDMT 120420 is stocked here in 1 variants from Achteck. Published applications cover Cast iron. Key dimensions: 12.7 mm inscribed circle, 4.76 mm thickness, 2 mm nose radius.
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 120420.
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) | 2 mm |
| Cutting edge length (L) | 8.7 mm |
| Fixing hole diameter (D1) | 4.4 mm |
| Hand | Neutral |
| Variants in stock | 1 |
| Brands | Achteck |
Carbide grades available
1 variants of SDMT 120420 are stocked in these grades: AP251K.
Across this range the grades specified most often are AP251K. 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 120420: MM4.
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 cast iron, see our material-specific guide.