SCMT 120404 dimensions
| Inscribed circle IC | 12.7 mm |
| Cutting edge length | 12.70 mm |
| Thickness s | 4.76 mm |
| Nose radius rε | 0.4 mm |
| Corner angle | 90° |
| Clearance angle | 7° |
| Tolerance M | IC ±0.08 · corner height ±0.13 · thickness ±0.13 mm |
| ANSI equivalent (inch) | SCMT 431 |
What SCMT 120404 tells you on the shop floor
90° corner: the strongest edge, takes large chip loads. Ideal for roughing.
Positive insert (7°): lower cutting forces and less chatter. For finishing, boring, thin-walled parts and lighter machines.
Pressed, medium tolerance: economical, fine for roughing and where you do not need repeatability to a few hundredths of a mm at every insert change.
Small radius: lower forces and chatter, good finish at low feed.
Typical holders for SCMT
For a positive square 90° insert the most common ISO 5608 holders are:
- SSBCR/L · lead angle 75°
- SSSCR/L · lead angle 45°
The final R or L means right or left hand. Shank size, length and the exact clamping are in the manufacturer's catalogue.
In inches, with the ANSI designation, the same insert is SCMT 431: size in eighths of an inch, thickness in sixteenths, radius in sixty-fourths. Converting any code, both ways, is in ISO Inserts Pro.
Other SCMT sizes
Same size, other version
Designation to ISO 1832; reference tables: Mitsubishi Materials turning catalogue (insert identification). Holders to ISO 5608. Chipbreaker, grade and cutting data differ between manufacturers: the catalogue of the insert you use is what counts.