High Feed EXN03R head for LNMU0303 inserts - cylindrical shank
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Individual variants may differ in price
Product code: 3382-7997E
Product description
EXN03R high-feed cutter for LNMU0303 inserts — cylindrical shank
Rough milling at high feed rates · replaceable LNMU0303ZER inserts
EXN03R is a cylindrical-shank milling cutter body for high-feed roughing. It uses replaceable LNMU0303ZER inserts. Each size is identified by its cutting diameter, shank diameter, overall length and number of insert seats. Cutting inserts are sold separately.
1. Applications
The cutter is intended for rough milling at high feed rates, including pocket machining. Extended versions allow the tool length to be selected for the location of the surface being machined. Access to a deep pocket depends on its geometry and the dimensions of the selected variant.
High feed describes operation at a high feed rate. Select cutting conditions for the insert, workpiece material and machining setup.
2. Workpiece material and insert selection
| Workpiece material | Cutting element selection |
|---|---|
| Steel | LNMU0303ZER insert for steel |
| Stainless steel | LNMU0303ZER insert for stainless steel |
| Cast iron | LNMU0303ZER insert for cast iron |
The application range and permissible workpiece hardness depend on the insert grade and geometry. The EXN03R body designation does not define a single HRC limit for every insert.
3. Cutter construction
| Parameter | Value |
|---|---|
| Body series | EXN03R |
| Tool type | High-feed milling cutter |
| Shank | Cylindrical |
| Body material | Hardened spring steel |
| Body manufacture | Ground |
| Compatible insert | LNMU0303ZER |
| Insert clamping | Screw clamping |
| Number of insert seats | Defined by T in the selected variant designation |
The body and inserts are separate components. A worn cutting edge does not require replacement of the entire cutter: the cutting element is a replaceable insert located in its seat.
4. Dimensions and variant selection
Select the size in the product variants. Check the cutting diameter, cylindrical shank diameter, overall length and number of insert seats separately. Cutting diameter may differ from shank diameter.
| Code symbol | Meaning |
|---|---|
| C | Cylindrical shank diameter, in mm |
| D | Cutting diameter, in mm |
| L | Overall tool length, in mm |
| T | Number of cutting-insert seats |
Variant cards show the confirmed dimensions of each size. The diagrams are illustrative; do not measure lengths or diameters using the scale of the photograph.
5. Reading the EXN03R designation
Our code lists the following after the series name: C — shank diameter, cutting diameter, overall length and the number of insert seats T.
For example, C25, D26, L160, T4 means a Ø25 mm shank, a Ø26 mm cutting diameter, a 160 mm overall length and four insert seats. Overall length includes the cutting head and the shank.
6. LNMU0303ZER inserts
The cutter is designed for LNMU0303ZER inserts. Each insert has four cutting edges, allowing the insert to be indexed to another edge after the first edge becomes worn. Four edges on one insert are a separate specification from the number of seats in the cutter body.
When selecting inserts, match the designation and choose a grade and geometry suitable for the workpiece material. A photograph with installed inserts illustrates the construction and how the inserts are located.
7. Supplied components and chip removal
| Component | Included |
|---|---|
| EXN03R cutter body | Yes — in the selected size |
| Clamping screws | Yes |
| Key | Yes |
| LNMU0303ZER cutting inserts | No — sold separately |
Dry machining is possible when the selected inserts and machining conditions allow it. Compressed air can be used to clear chips from the working area. During pocket machining, provide chip removal from the cutter working area.
8. Selection questions
Are inserts included?
No. The set includes the cutter body, screws and key. LNMU0303ZER inserts are sold separately.
Do C and D refer to the same diameter?
C is the shank diameter; D is the cutting diameter. Compare both when selecting a variant.
Does T4 mean four cutting edges on one insert?
T4 means four insert seats in the cutter body. The four edges of an LNMU0303ZER insert are a separate insert feature.
Does the body have one workpiece-hardness limit?
The hardness and material range depend on the selected insert. Check the specifications of the chosen LNMU0303ZER grade.
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