High-performance Grooving Insert MGMN ...-J RT300
The MGMN ...-J RT300 grooving insert convinces with its soft-cutting geometry and is explicitly engineered for precise grooving and parting off tasks. It noticeably reduces the emerging cutting pressure, thereby supporting an excellent surface finish and controlled chip flow. Thanks to the resilient RT300 PVD coating, this indexable insert is optimally suited for professional use and provides reliable tool life. Operators benefit from thoughtful design features that promote efficient workflows in practical machining.
Suitable materials

Technical data
- Geometry type: Soft-cutting (J-geometry)
- Machining application: Grooving and parting off
- Coating method: PVD (Physical Vapour Deposition)
- ISO classification: P15-P25 (Steel) and M10-M25 (Stainless Steel)
| Grooving Insert |
MGMN... |
| Workpiece Materials |
Steel/Stainless Steel
|
| Grade |
RT300: PVD-coated P15-P25 and M10-M25 for universal use in steel and stainless steel |
| Grooving system |
MGM./MRM.-System |
| Packaging unit |
10 Pc. |
Dimensions of Grooving Insert MGMN ...-J RT300
|
Art. Nr. |
B |
R |
L |
S |
| MGMN 200-J RT300 |
1331125 |
2 |
0,2 |
16 |
3,5 |
| MGMN 300-J RT300 |
1331126 |
3 |
0,2 |
21 |
4,8 |
| MGMN 400-J RT300 |
1331127 |
4 |
0,3 |
21 |
4,8 |
| MGMN 500-J RT300 |
1331129 |
5 |
0,3 |
26 |
4,8 |
Cutting data
|
Steel |
Stainless Steel |
|
Vc (m/min) |
f (mm) |
Vc (m/min) |
f (mm) |
| MGMN J RT300 |
90-220 |
0,08-0,14 |
80-160 |
0,07-0,12 |
Applications
The MGMN ...-J RT300 variant is geared towards professional use in modern turning operations. Its core application is reliable grooving and parting off in common steels as well as stainless steels. Due to the soft-cutting design, it shows its strengths especially on workpieces that require precise edge quality and a uniform surface.
Because it is fully compatible with the established MGM. and MRM. grooving systems, the tool can be flexibly integrated into existing machine setups and processes. This minimizes setup times and creates good conditions for high productivity.
Special features
A major advantage of this grooving insert is the combination of a sharp, soft-cutting edge and the wear-resistant RT300 carbide grade. The PVD coating effectively protects the substrate (P15-P25 and M10-M25) against abrasive wear. Furthermore, the specialized chip-breaker geometry offers excellent prerequisites for controlled chip breaking, which noticeably supports process stability during parting off.
Providing the inserts in a practical packaging unit of 10 pieces ensures that operators always have a sufficient number of cutting edges available for series production.