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Description
CROSS SECTION 25×25 mm
LENGTH 150 mm
INSERT CNMG 1204rr
ANGLE κr 75°
Technical specifications of the TCKNL 25x25 M12 turning tool
| Technical data | |
|---|---|
| ISO designation | TCKNL 25x25 M12 |
| Shank height (h) | 25 mm |
| Shank width (b) | 25 mm |
| Overall length (L) | 150 mm |
| Functional overhang (f) | 32 mm |
| Entering angle (κr) | 75° |
| Clearance angle | 0° (negative) |
| Clamping system | ISO — top and through-hole clamping (T) |
| Insert type | CNMG 1204rr |
| Cutting direction | L — left-hand (R version available) |
| Manufacturer | Smoxh |
Turning tool TCKNL 25x25 M12 – for longitudinal turning
Indexable turning tool 25×25 mm for a CNMG insert
Turning tool TCKNL 25x25 M12 is an indexable turning tool designed for external turning on conventional and CNC lathes. The shank with a 25×25 mm cross section and a length of 150 mm provides the rigidity required for industrial machining. The geometry with a 75° entering angle reduces radial force compared with a tool with a 90° angle.
In the top-and-hole clamping system (T), the clamp secures the CNMG 1204rr insert from above and through its hole. The negative geometry of the 80° rhombic insert with 4 cutting edges is suitable for roughing and medium machining, providing high cutting edge strength and cost efficiency thanks to its double-sided design. The turning tool is compatible with CNMG 12 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the TCKNL designation of the TCKNL 25x25 M12 turning tool
What the individual letters in the ISO designation mean
Decoding the designation TCKNL
T
CLAMPING
Top and through-hole clamping (T)
The clamp secures the insert from above and through its hole.
C
INSERT SHAPE
80° rhombus 80°
CNMG insert — negative, double-sided, 4 cutting edges (2 per side)
K
ENTERING ANGLE
κr = 75°
Longitudinal turning — reduced radial force
N
CLEARANCE ANGLE
α = 0° (neg.)
Negative geometry — double-sided inserts, edges on both sides
L
DIRECTION
Left-hand (L)
Feed to the right — from the spindle toward the tailstock
Shank: 25×25 mm · Insert: CNMG 1204rr
Typical applications of the TCKNL 25x25 M12 turning tool
Cutting operations:
| ▸ | Longitudinal turning — the 75° angle reduces radial force compared with a tool with a 90° angle |
| ▸ | Roughing and medium machining of steel and cast iron — negative CNMG geometry provides a stronger cutting edge and 2× more edges |
| ▸ | External taper turning — machining tapered and contoured surfaces |
| ▸ | CNC production runs — quick insert replacement and repeatability |
Included
Package contents for TCKNL 25x25 M12
Package contents:
| ✓ | Tool body TCKNL 25x25 M12 | 1 pcs |
| ✓ | Top clamp with screw | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | CNMG 1204rr cutting insert (sold separately) | — |
Compatible CNMG 1204rr insert
CNMG 1204rr
The cutting insert is not included in the set — must be purchased separately. CNMG insert. Negative geometry means that the insert is double-sided and has 4 cutting edges, providing a stronger cutting edge and twice as many edges as a single-sided insert.
Select the insert grade to match the workpiece material: P (structural steels), M (stainless steel), K (cast iron), N (aluminum). You can find compatible inserts in the section "Related products" below.
Insert installation and replacement for the TCKNL 25x25 M12 turning tool
Instructions for top and through-hole clamping (T)
Insert replacement procedure step by step
1 Loosen the clamp
Loosen the clamp screw 2-3 turns
2 Clean the insert seat
Remove chips and debris
3 Install the insert
Position in the seat under the clamp
4 Tighten the clamp
Torque 1.5–2.5 Nm
Important: Do not exceed the recommended tightening torque — this may damage the thread in the seat or crack the insert.
Checks before starting work:
| ▸ | Tool overhang — do not exceed 1.5× the shank height without support |
| ▸ | Cutting edge height — set the cutting edge at spindle centerline height |
| ▸ | Insert seat condition — check that the contact surface is not damaged or worn |
| ▸ | Secure clamping — the insert must have no play in the seat |
| ▸ | Indexing — when an edge wears out, rotate the insert to a fresh edge (4 edges in total) |
Note: Use coolant during machining — it extends insert life and improves surface finish. When machining without coolant, reduce the cutting parameters by 20–30%.
Frequently asked questions — TCKNL 25x25 M12
This tool accepts inserts CNMG 1204rr in any carbide grade. Select the grade to match the workpiece material: P (steels), M (stainless steel), K (cast iron), N (aluminum). You can find compatible inserts in the "Related products" section below.
The 75° entering angle reduces radial force compared with a tool with a 90° angle. It is suitable for longitudinal turning.
The CNMG insert has negative geometry (clearance angle 0°), which means that it is double-sided with 4 cutting edges. When one edge wears out, rotate or flip the insert to use the next edge — this significantly reduces tooling cost per part.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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