High-performance wiper turning insert for steel machining
The indexable insert CNMG...-W RT315G opens up flexible application possibilities for finishing and medium machining in professional turning operations. Thanks to the integrated wiper technology, this tool creates excellent conditions for significantly increased productivity: The modified geometry smooths the surface directly during turning, which either improves the surface finish at the same feed rate or allows the feed rate to be increased while maintaining constant quality. Paired with the CVD-coated P15 carbide RT315G, this version is a well-thought-out solution for continuous cuts in steel, supporting stable processes and long tool lives.
Suitable materials

Technical data
- Shape: CNMG
- Processing: Finish/Medium
- Cutting condition: Continuous
- Workpiece Material: Steel
- Grade: RT315G: Next-generation CVD-coated P15 carbide for continuous cutting.
- Packaging unit: 10 Pc.
Dimensions of Indexable insert - CNMG...-W RT315G
|
Item Nr. |
r |
L |
I.C. |
S |
| CNMG 120404-W RT315G |
1661751 |
0,4 |
12,9 |
12,7 |
4,76 |
| CNMG 120408-W RT315G |
1661752 |
0,8 |
12,9 |
12,7 |
4,76 |
| CNMG 120412-W RT315G |
1661753 |
1,2 |
12,9 |
12,7 |
4,76 |
Cutting data
|
Steel |
|
Vc (m/min) |
fn (mm/U) |
ap (mm) |
| CNMG 120404-W RT315G |
140-260 |
0,10-0,50 |
0,5-3,5 |
| CNMG 120408-W RT315G |
140-260 |
0,10-0,50 |
0,8-3,5 |
| CNMG 120412-W RT315G |
140-260 |
0,10-0,50 |
1,0-3,5 |
Applications
This tool is designed for professional use in general steel machining and demonstrates its strengths particularly in longitudinal and face turning. Thanks to the wiper cutting edge, the CNMG variant is ideal for series production in mechanical engineering and the automotive industry, where high demands are placed on the dimensional accuracy and surface quality of the components.
Due to the special geometry, operators can streamline machining processes, as time-consuming finishing work such as polishing or fine grinding is eliminated in many cases. This makes the use of tool holders with the CNMG version highly economical when large quantities need to be produced in continuous cuts.
Special features
The core of this indexable insert is the innovative wiper geometry, which can increase the feed rate compared to standard inserts without compromising quality. This feature is supported by the advanced cutting material RT315G. The CVD coating of the P15 carbide effectively protects the cutting edge from wear. Furthermore, the negative basic shape allows it to be used in stable holder systems and ensures secure power transmission during turning operations.