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Description
DIAMETER Ø20 mm
LENGTH 180 mm
INSERT TNMG 1604rr
ANGLE κr 90°
Technical specifications of the S20 MTFNR 16 boring bar
| Technical Data | |
|---|---|
| ISO designation | S20 MTFNR 16 |
| Shank diameter (d) | Ø20 mm |
| Effective height (h) | 18 mm |
| Overall length (L) | 180 mm |
| Functional overhang (f) | 49 mm |
| Min. bore diameter (D_min) | Ø25 mm |
| Entering angle (κr) | 90° |
| Clearance angle | 0° (negative) |
| Clamping system | ISO — combination (M) |
| Insert type | TNMG 1604rr |
| Cutting direction | R — right-hand |
| Shank material | Steel (S) |
| Manufacturer | Varel |
S20 MTFNR 16 boring bar – for internal turning and bore finishing
Precision internal turning tool for machining bores from Ø25 mm
Boring bar S20 MTFNR 16 is a professional boring bar designed for longitudinal turning and bore finishing with diameters starting at 25 mm. The round steel shank with a diameter of Ø20 mm and a length of 180 mm ensures stable cutting even at longer tool overhangs. The geometry with an entering angle of 90° allows facing and longitudinal turning along a shoulder.
The combination clamping system (M) ensures maximum clamping rigidity and quick replacement of the TNMG 1604rr insert. 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 boring bar is compatible with TNMG 16 inserts in various carbide grades — select the grade to match the workpiece material.
Typical applications of the S20 MTFNR 16 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø25 mm |
| ▸ | Bore finishing — negative TNMG geometry provides high cutting edge strength and a smooth surface |
| ▸ | Internal taper turning — bearing seats, internal chamfers, Morse tapers |
| ▸ | Light facing — the 90° angle allows machining the face inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
Package contents for S20 MTFNR 16
Package contents:
| ✓ | Boring bar body S20 MTFNR 16 | 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 maximum cutting edge strength and cost efficiency.
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 S20 MTFNR 16 boring bar
Instructions for the combination clamping system (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 4×d (80 mm) without support; use vibration damping for greater overhang |
| ▸ | Cutting edge height — set the cutting edge at spindle center height (±0.05 mm) |
| ▸ | 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 internal coolant (through the spindle) for boring whenever possible. When machining without coolant, reduce cutting parameters by 20–30%. Long tool overhang promotes vibration — if vibration occurs, reduce the depth of cut and increase the feed.
Frequently asked questions — S20 MTFNR 16
The minimum bore diameter is Ø25 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
For a steel shank of Ø20 mm, the recommended maximum overhang without damping is 4×d, or 80 mm. Above this value, vibration may occur — reduce the depth of cut or use a vibration-damped boring bar.
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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