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Description
CROSS SECTION 20×20 mm
LENGTH 125 mm
INSERT VNMG 1604rr
ANGLE κr 93°
Technical specifications of the TVJNR 20x20 K16 turning tool
| Technical data | |
|---|---|
| ISO designation | TVJNR 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 — top and through-hole clamping (T) |
| Insert type | VNMG 1604rr |
| Cutting direction | R — right-hand (L version available) |
| Manufacturer | Smoxh |
TVJNR 20x20 K16 turning tool – for longitudinal turning with light facing
20×20 mm indexable turning tool for a VNMG insert
Turning tool TVJNR 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 top and through-hole clamping system (T), the clamp secures the VNMG 1604rr insert from above and through its hole. The negative geometry of the 35° diamond insert with 4 cutting edges is well suited to roughing and medium machining, providing high cutting edge strength and cost efficiency thanks to its double-sided design. The turning tool is compatible with VNMG 16 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the TVJNR designation of the TVJNR 20x20 K16 turning tool
What the individual letters in the ISO designation mean
Decoding the designation TVJNR
T
CLAMPING
Top and through-hole clamping (T)
The clamp secures the insert from above and through its hole.
V
INSERT SHAPE
35° rhombus 35°
VNMG insert — negative, double-sided, 4 edges (2 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
R
DIRECTION
Right-hand (R)
Feed to the left — from the tailstock toward the spindle
Shank: 20×20 mm · Insert: VNMG 1604rr
Typical applications of the TVJNR 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 VNMG 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
TVJNR 20x20 K16 package contents
Package contents:
| ✓ | Tool body TVJNR 20x20 K16 | 1 pcs |
| ✓ | Top clamp with screw | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | VNMG 1604rr cutting insert (sold separately) | — |
Compatible VNMG 1604rr insert
VNMG 1604rr
The cutting insert is not included in the set — must be purchased separately. VNMG 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.
Installing and replacing the insert in the TVJNR 20x20 K16 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 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 (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 — TVJNR 20x20 K16
This tool accepts inserts VNMG 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 VNMG insert has negative geometry (clearance angle 0°), which means 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.
Product accessories
Carbide insert VNMG 160404 HS H6310 Horn
Reference: 0000009634 In stock > 10 items
€7.11
€8.74 brutto
Carbide insert VNMG 160408 HS H6310 Horn
Reference: 0000009635 In stock > 10 items
€7.11
€8.74 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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