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Description
DIAMETER Ø25 mm
LENGTH mm
INSERT TCMT 1604rr
ANGLE κr °
Technical specifications of the S25 STWCR 16 boring bar
| Technical Data | |
|---|---|
| ISO designation | S25 STWCR 16 |
| Shank diameter (d) | Ø25 mm |
| Effective height (h) | 23 mm |
| Overall length (L) | mm |
| Entering angle (κr) | ° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | TCMT 1604rr |
| Cutting direction | R — right-hand |
| Shank material | Steel (S) |
| Manufacturer | Varel |
S25 STWCR 16 boring bar – for internal turning and bore finishing
Precision boring bar for internal machining
Boring bar S25 STWCR 16 is a professional boring bar designed for longitudinal turning and bore finishing. The round steel shank with a diameter of ø25 mm and a length of mm ensures cutting stability even at greater tool overhang. The geometry with an entering angle of ° enables efficient material removal.
The central screw clamping system (S) ensures the highest cutting edge positioning repeatability and easy replacement of the TCMT 1604rr insert. The positive geometry of the 60° triangular insert with 3 cutting edges is suitable for finishing, providing low cutting forces and a smooth machined surface. The boring bar is compatible with TCMT 16 inserts in various carbide grades — select the grade to match the workpiece material.
Typical applications of the S25 STWCR 16 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical holes |
| ▸ | Bore finishing — positive TCMT geometry provides low cutting forces and a smooth surface |
| ▸ | Internal taper turning — bearing seats, internal chamfers, Morse tapers |
| ▸ | Light facing — the ° angle allows facing inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
Package contents for S25 STWCR 16
Package contents:
| ✓ | Boring bar body S25 STWCR 16 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | TCMT 1604rr cutting insert (sold separately) | — |
Compatible TCMT 1604rr insert
TCMT 1604rr
The cutting insert is not included in the set — must be purchased separately. TCMT insert. Positive geometry means that the insert is single-sided and has 3 cutting edges, providing low cutting forces and good surface quality.
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 S25 STWCR 16 boring bar
Instructions for the center screw clamping system (S)
Insert replacement procedure step by step
1 Unscrew the screw
Unscrew the center screw 2-3 turns
2 Clean the insert seat
Remove chips and debris
3 Install the insert
Position in the seat
4 Tighten the screw
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 (100 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 (3 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 — S25 STWCR 16
The minimum hole diameter is determined by the tool head dimensions — check the D_min parameter in the specification table above.
For a steel shank of Ø25 mm, the recommended maximum overhang without damping is 4×d, or 100 mm. Above this value, vibration may occur — reduce the depth of cut or use a vibration-damped boring bar.
The TCMT insert has positive geometry (clearance angle 7°), which means that it is single-sided with 3 cutting edges. When one edge wears out, rotate the insert to a fresh edge.
Product accessories
Carbide insert TCMT 16T308 H6310 Horn
Reference: 0000006146 In stock > 10 items
€3.68
€4.53 brutto
Carbide insert TCMT 16T304 H6310 Horn
Reference: 0000007829 In stock > 10 items
€3.68
€4.53 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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