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Description
DIAMETER Ø25 mm
LENGTH 250 mm
INSERT TCMT 1604rr
ANGLE κr 93°
Technical specifications of the S25S STUCR 16 boring bar
| Technical data | |
|---|---|
| ISO designation | S25S STUCR 16 |
| Shank diameter (d) | Ø25 mm |
| Effective height (h) | 23 mm |
| Overall length (L) | 250 mm |
| Functional overhang (f) | 19.5 mm |
| Min. bore diameter (D_min) | Ø32 mm |
| Entering angle (κr) | 93° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | TCMT 1604rr |
| Cutting direction | R — right-hand (L version available) |
| Shank material | Steel (S) |
| Manufacturer | Smoxh |
S25S STUCR 16 boring bar – for internal turning and bore finishing
Internal turning tool for machining bores from Ø32 mm
Boring bar S25S STUCR 16 is an indexable boring bar designed for longitudinal turning and bore finishing with diameters from 32 mm. The round steel shank with a diameter of Ø25 mm and a length of 250 mm provides cutting stability even with greater tool overhang. The geometry with an entering angle of 93° allows turning along the wall with simultaneous light facing.
In the central screw clamping system (S), the screw secures the TCMT 1604rr insert through its hole, so only one screw needs to be loosened for replacement. The positive geometry of the 60° triangular insert with 3 cutting edges is well suited to 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.
Decoding the STUCR designation of the S25S STUCR 16 boring bar
What the individual letters in the ISO designation mean
Decoding the designation STUCR
S
CLAMPING
Center screw (S)
The screw secures the insert through its center hole
T
INSERT SHAPE
60° triangle 60°
TCMT insert — positive, single-sided, 3 edges
U
ENTERING ANGLE
κr = 93°
Longitudinal turning inside the bore with light facing
C
CLEARANCE ANGLE
α = 7° (pos.)
Positive geometry — low cutting forces, finishing and medium machining
R
DIRECTION
Right-hand (R)
Feed to the left — from the tailstock toward the spindle
Shank: Ø25 mm (S25S, steel) · Insert: TCMT 1604rr
Typical applications of the S25S STUCR 16 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø32 mm |
| ▸ | 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 93° angle allows machining the face inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
S25S STUCR 16 package contents
Package contents:
| ✓ | Boring bar body S25S STUCR 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 S25S STUCR 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 1.0–2.0 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 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 (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 — S25S STUCR 16
The minimum bore diameter is Ø32 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
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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