High-Performance Solid Carbide Undersize Milling Cutter
The solid carbide undersize milling cutter is a well-thought-out solution for precise contour and slot machining. Its specially designed undersize diameter allows operators to rough slots or keyways perfectly, leaving the ideal allowance for the final finishing pass. Featuring two flutes and a 30° helix angle, this tool ensures rapid chip evacuation during medium processing tasks. Thanks to its centre-cutting geometry, demanding plunging and ramping operations can be executed efficiently.
Suitable materials

Technical data
- Number of flutes: 2-flute
- Helix angle: 30°
- Shank type: Weldon shank
- Special feature: Centre cutting
- Packaging unit: 1 pc
| Mill Type |
Solid Carbide Undersize Milling Cutter |
| Helix Angle |
30° |
| Workpiece Material |
Steel, Stainless Steel, Cast Iron
|
| Processing |
Medium |
| Lenght |
Standard Lenght |
| Shank |
Weldon-Shank |
| Flutes |
2 |
| Grade |
RT405: PVD-coated fine-grain carbide for general Application in milling (VHM) |
| Packaging unit |
1 Pc |
Dimensions of Solid Carbide Undersize Milling Cutter
|
Art. Nr. |
D |
d(h6) |
H |
L |
KCH |
CHW |
Z |
| UMF-2,8 RT303 |
2551251 |
2,8 |
6 |
7 |
57 |
0 |
0 |
2 |
| UMF-3,8 RT303 |
2551252 |
3,8 |
6 |
8 |
57 |
0 |
0 |
2 |
| UMF-4,8 RT303 |
2551253 |
4,8 |
6 |
8 |
57 |
0 |
0 |
2 |
| UMF-5,75 RT303 |
2551254 |
5,75 |
6 |
10 |
57 |
0 |
0 |
2 |
| UMF-7,75 RT303 |
2551255 |
7,75 |
8 |
16 |
63 |
45 |
0,10 |
2 |
| UMF-8,7 RT303 |
2551256 |
8,7 |
10 |
16 |
72 |
45 |
0,10 |
2 |
| UMF-11,7 RT303 |
2551257 |
11,7 |
12 |
22 |
83 |
45 |
0,10 |
2 |
| UMF-13,7 RT303 |
2551258 |
13,7 |
14 |
22 |
83 |
45 |
0,10 |
2 |
| UMF-15,7 RT303 |
2551259 |
15,7 |
16 |
26 |
92 |
45 |
0,15 |
2 |
Applications
This tool is engineered for the medium machining of steel, stainless steel, and cast iron components. It offers versatile application possibilities for slotting, shoulder milling, plunge, and ramping operations. The specific undersize diameters ranging from 2.8 mm to 15.7 mm are ideal for professionals looking to achieve tight tolerances and precise fits in their milling workflows.

Special features
The undersize mill convinces with its combination of fine-grain solid carbide and a robust PVD coating, creating an excellent basis for consistent tool performance. Additionally, the Weldon shank guarantees a twist-proof fit inside the tool holder, reducing vibrations and supporting the dimensional accuracy of the machined workpieces.