SEGT 12T3 Milling Inserts
Compare suitable materials and applications, then choose a brand to view the exact SKUs.
- ISO Code
- SEGT12T3
- Insert Size
- 12T3
- Shape
- S
Find the Right Option
Select the workpiece material and application. Brand remains optional.
Brands
All available options for this parent model.
SEGT 12T3 is a square 90° milling insert with 8 usable cutting edges, used mainly for heavy roughing, square shoulders and interrupted cuts. We list 4 stock-keeping variants of it from Achteck, covering Steel, Stainless steel, Cast iron, Hardened steel.
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 SEGT 12T3.
Geometry and dimensions
| Insert family | SEGT |
|---|---|
| Category | Milling Inserts |
| Shape | square 90° (S) |
| Usable cutting edges | 8 |
| Inscribed circle (IC) | 13.4 mm |
| Thickness (S) | 3.97 mm |
| Nose radius (RE) | 1.5 mm |
| Cutting edge length (L) | 8.8 mm |
| Fixing hole diameter (D1) | 4.1 mm |
| Hand | Neutral |
| Variants in stock | 4 |
| Brands | Achteck |
Carbide grades available
4 variants of SEGT 12T3 are stocked in these grades: AP153H, AP151H, AP251K, AP251U.
Across this range the grades specified most often are AP153H, AP151H, AP251K, AP251U. 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 SEGT 12T3: 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
For more on cutting steel, see our material-specific guide.