Professional finishing with the CNMG-SF RTC+
With the indexable insert CNMG…-SF RTC+, machining professionals receive a reliable tool for demanding fine turning applications. The combination of the highly wear-resistant, PVD-coated cermet grade and the specific SF finishing geometry ensures a clean surface finish during continuous turning operations. Thanks to its stable cutting edges, this insert supports highly efficient workflows in the production of precision components made from common steel alloys and stainless steel.
Suitable materials

Technical data
- Insert geometry: Negative rhombic (80°)
- Operation type: Super-finishing and fine finishing (SF)
- Cutting condition: Continuous cut
- Packaging unit: 10 pieces
| Shape |
CNMG |
| Processing |
Finish
|
| Workpiece Material |
Steel and Stainless Steel |
| Grade |
RTC+: PVD coated P05-P15 Cermet grade for finishing of steel and stainless steel |
| Packaging unit |
10 Pc. |
Dimensions of indexable insert CNMG...-SF RTC+
|
Item Nr. |
r |
L |
I.C. |
S |
| CNMG 090304-SF RTC+ |
1661681 |
0,4 |
9,7 |
9,525 |
3,18 |
| CNMG 120404-SF RTC+ |
1661683 |
0,4 |
12,9 |
12,7 |
4,76 |
| CNMG 120408-SF RTC+ |
1661684 |
0,8 |
12,9 |
12,7 |
4,76 |
Cutting data
|
Steel |
Stainless Steel |
|
Vc (m/min) |
fn (mm/U) |
ap (mm) |
Vc (m/min) |
fn (mm/U) |
ap (mm) |
| CNMG 090304-SF RTC+ |
140-400 |
0,05-0,12 |
0,1-1,5 |
100-260 |
0,05-0,12 |
0,1-1,5 |
| CNMG 120404-SF RTC+ |
140-400 |
0,05-0,15 |
0,1-1,5 |
100-260 |
0,05-0,15 |
0,1-1,5 |
| CNMG 120408-SF RTC+ |
140-400 |
0,05-0,18 |
0,1-1,5 |
100-260 |
0,05-0,18 |
0,1-1,5
|
Applications
The CNMG-SF cermet insert is primarily designed for high-precision finishing tasks on modern CNC turning centers. It offers excellent performance when machining contoured steel and stainless steel components that require tight dimensional tolerances as well as outstanding surface quality.
Special features
The RTC+ grade (P05-P15) perfectly combines the toughness of a PVD coating with the fine microstructure of a cermet substrate. This pairing significantly reduces the tendency for built-up edges at small depths of cut while maintaining reliable cutting edge stability. Furthermore, the specialized SF chipbreaker promotes controlled chip evacuation even at very low feed rates.