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Description
CROSS SECTION 20×20 mm
LENGTH 125 mm
INSERT TNMG 1604rr
ANGLE κr 93°
Technical specifications of the MTJNL 20x20 K16 turning tool
| Technical data | |
|---|---|
| ISO designation | MTJNL 20x20 K16 |
| Shank height (h) | 20 mm |
| Shank width (b) | 20 mm |
| Overall length (L) | 125 mm |
| Functional overhang (f) | 26 mm |
| Entering angle (κr) | 93° |
| Clearance angle | 0° (negative) |
| Clamping system | ISO — combination (M) |
| Insert type | TNMG 1604rr |
| Cutting direction | L — left-hand (R version available) |
| Manufacturer | Smoxh |
MTJNL 20x20 K16 turning tool – for longitudinal turning with light facing
20×20 mm indexable turning tool for a TNMG insert
Turning tool MTJNL 20x20 K16 is an indexable turning tool designed for external turning on conventional and CNC lathes. The shank, with a cross section of 20×20 mm and a length of 125 mm, provides the rigidity required for industrial machining. The geometry with an entering angle of 93° allows turning along the wall with simultaneous light facing.
In the combination clamping system (M), the TNMG 1604rr insert is held simultaneously by a top clamp and a pin in its hole. The negative geometry of the 60° triangular insert with 6 cutting edges is suitable for roughing and medium machining, providing high cutting edge strength and cost efficiency thanks to its double-sided design. The tool is compatible with TNMG 16 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the MTJNL designation of the MTJNL 20x20 K16 turning tool
What the individual letters in the ISO designation mean
Decoding the designation MTJNL
M
CLAMPING
Combination (M)
The top clamp and pin secure the insert simultaneously
T
INSERT SHAPE
60° triangle 60°
TNMG insert — negative, double-sided, 6 edges (3 per side)
J
ENTERING ANGLE
κr = 93°
Longitudinal turning + light facing
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: 20×20 mm · Insert: TNMG 1604rr
Typical applications of the MTJNL 20x20 K16 turning tool
Cutting operations:
| ▸ | Longitudinal turning — the 93° angle provides stable cutting along the workpiece axis with light facing |
| ▸ | Roughing and medium machining of steel and cast iron — negative TNMG geometry provides a stronger cutting edge and 2× as many edges |
| ▸ | Machining shafts and bushings — a general-purpose tool for external turning of rotational parts |
| ▸ | Taper turning — machining tapered surfaces on CNC and conventional lathes |
| ▸ | CNC production runs — quick insert replacement and repeatable positioning |
Included
Package contents for MTJNL 20x20 K16
Package contents:
| ✓ | Tool body MTJNL 20x20 K16 | 1 pcs |
| ✓ | Combination clamp (clamp + pin) | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | TNMG 1604rr cutting insert (sold separately) | — |
Compatible TNMG 1604rr insert
TNMG 1604rr
The cutting insert is not included in the set — must be purchased separately. TNMG insert. Negative geometry means that the insert is double-sided and has 6 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 MTJNL 20x20 K16 turning tool
Instructions for combination clamping (M)
Insert replacement procedure step by step
1 Loosen the clamp
Loosen the clamping screw 2-3 turns
2 Clean the insert seat
Remove chips and debris
3 Install the insert
Fit onto the pin and press down
4 Tighten the clamp
Torque 2.0–3.5 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 (6 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 — MTJNL 20x20 K16
This tool accepts inserts TNMG 1604rr 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 entering angle of 93° provides stable longitudinal turning with light facing.
The TNMG insert has negative geometry (clearance angle 0°), which means it is double-sided with 6 cutting edges. When one edge wears out, rotate or flip the insert to use the next edge — this significantly reduces tooling cost per part.
Product accessories
Carbide insert TNMG 160408 R-S AE9025 Horn
Reference: 11266 In stock > 10 items
€5.13
€6.31 brutto
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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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