SDMT 09T308 Milling Inserts
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- ISO Code
- SDMT09T308
- Insert Size
- 09T308
- Shape
- S — Square
- Radius
- 0.8 mm
- Thickness
- 3.97 mm
- d / IC
- 9.525 mm
- Relief Angle
- 15°
Find the Right Option
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Brands
All available options for this parent model.
A square 90° milling insert with 8 cutting edges, SDMT 09T308 is stocked here in 14 variants from Achteck. Published applications cover Steel, Stainless steel, Cast iron, Heat-resistant alloys. Key dimensions: 9.53 mm inscribed circle, 3.97 mm thickness, 0.8 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 09T308.
Geometry and dimensions
| Insert family | SDMT |
|---|---|
| Category | Milling Inserts |
| Shape | square 90° (S) |
| Usable cutting edges | 8 |
| Inscribed circle (IC) | 9.53 mm |
| Thickness (S) | 3.97 mm |
| Nose radius (RE) | 0.8 mm |
| Cutting edge length (L) | 7.9–7.99 mm (typically 7.99 mm) |
| Fixing hole diameter (D1) | 3.9–4.4 mm (typically 3.9 mm) |
| Hand | Neutral |
| Variants in stock | 14 |
| Brands | Achteck |
Cutting data
The 14 variants of SDMT 09T308 listed here are supplied without a full published cutting-data set, so we do not publish one.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
14 variants of SDMT 09T308 are stocked in these grades: AC151K, AP251U, AP251K, AP351M, AP403M, AC301K, AP351U.
Across this range the grades specified most often are AC151K, AP251U, AP251K, AP351M, AP403M. 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 09T308: MM4, MR2, MM3.
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.