High-Performance Machining Solution: Turning Insert CNMG-PF RT315G
With the CNMG-PF RT315G, professional users gain a reliable tool for steel machining. This negative 80° rhombic indexable insert (CNMG) was developed to effectively overcome typical challenges encountered in finishing and medium machining. Especially in soft and tough materials, the PF geometry promotes smooth chip evacuation, significantly enhancing process stability. The substrate made of state-of-the-art P15 carbide combined with a resilient CVD coating creates excellent conditions for consistent results in continuous turning applications.
Suitable materials

Technical data
- Insert shape: CNMG (Negative, 80° rhombic geometry)
- Processing: Medium and Finish
- Chipbreaker: PF
- Grade: RT315G (Next-generation CVD-coated P15 carbide)
- Cutting condition: Continuous
- Workpiece Material: Steel
- Packaging unit: 10 pieces
Dimensions of CNMG-PF RT315G
|
Item Nr. |
r |
L |
I.C. |
S |
| CNMG 120404-PF RT315G |
1661811 |
0,4 |
12,9 |
12,7 |
4,76 |
CNMG 120408-PF RT315G
|
1661812 |
0,8 |
12,9 |
12,7 |
4,76 |
CNMG 120412-PF RT315G
|
1661813 |
1,2 |
12,9 |
12,7 |
4,76 |
Cutting data
|
Steel |
|
Vc (m/min) |
fn (mm/U) |
ap (mm) |
CNMG 120404-PF RT315G
|
140-260 |
0,10-0,30 |
0,5-3 |
CNMG 120408-PF RT315G
|
140-260 |
0,10-0,30 |
1-3 |
CNMG 120412-PF RT315G
|
140-260 |
0,10-0,30 |
1,5-3 |
Applications
This insert is specifically designed for turning processes that require high dimensional accuracy in the steel sector. From finely tuned finishing work to medium material removal, the cutting insert can be used versatilely on modern CNC lathes. Its configuration for continuous cuts makes it an excellent choice for the reliable mass production of smooth workpiece contours made of steel materials.
With variants offering corner radii of 0.4 mm, 0.8 mm, and 1.2 mm, machinists can flexibly adapt the tool to achieve the desired surface finish and meet the specific requirements of the respective component geometry.
Special features
The particular strength of the RT315G execution lies in its specialized PF geometry, which acts as an effective problem-solver for difficult-to-form chips. This targeted chip control not only prevents disruptive chip entanglement when working with softer steel grades but also reduces the thermal and mechanical impact on the cutting edge, which positively influences the tool life.
Together with the high-performance CVD coating and the robust P15 carbide substrate, the insert forms a well-coordinated unit that delivers convincing results in professional turning applications and supports stable workflows.