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Description
DIAMETER Ø25 mm
LENGTH 250 mm
INSERT SCMT 0903rr
ANGLE κr 45°
Technical specifications of the S25S SSSCL 09 boring bar
| Technical data | |
|---|---|
| ISO designation | S25S SSSCL 09 |
| 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) | 45° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | SCMT 0903rr |
| Cutting direction | L — left-hand (R version available) |
| Shank material | Steel (S) |
| Manufacturer | Smoxh |
Boring bar S25S SSSCL 09 – for internal turning and finishing of bores
Internal turning tool for machining bores from Ø32 mm
Boring bar S25S SSSCL 09 is an indexable boring bar designed for longitudinal turning and bore finishing with diameters from 32 mm. The round steel shank, ø25 mm in diameter and 250 mm long, ensures cutting stability even with greater tool overhang. The geometry with an entering angle of 45° enables simultaneous longitudinal turning and angled facing.
In the central screw clamping system (S), the screw secures the SCMT 0903rr insert through its hole, so replacement requires loosening just one screw. The positive geometry of the 90° square insert with 4 cutting edges is suitable for finishing, providing low cutting forces and a smooth machined surface. The boring bar is compatible with SCMT 09 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the SSSCL designation of the S25S SSSCL 09 boring bar
What the individual letters in the ISO designation mean
Decoding the designation SSSCL
S
CLAMPING
Center screw (S)
The screw secures the insert through its center hole
S
INSERT SHAPE
Square 90° 90°
SCMT insert — positive, single-sided, 4 edges
S
ENTERING ANGLE
κr = 45°
Turning + facing — 45° angle (square)
C
CLEARANCE ANGLE
α = 7° (pos.)
Positive geometry — low cutting forces, finishing and medium machining
L
DIRECTION
Left-hand (L)
Feed to the right — from the spindle toward the tailstock
Shank: Ø25 mm (S25S, steel) · Insert: SCMT 0903rr
Typical applications of the S25S SSSCL 09 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø32 mm |
| ▸ | Bore finishing — positive SCMT geometry provides low cutting forces and a smooth surface |
| ▸ | Internal taper turning — bearing seats, internal chamfers, Morse tapers |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
Package contents for S25S SSSCL 09
Package contents:
| ✓ | Boring bar body S25S SSSCL 09 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | SCMT 0903rr cutting insert (sold separately) | — |
Compatible SCMT 0903rr insert
SCMT 0903rr
The cutting insert is not included in the set — must be purchased separately. SCMT insert. Positive geometry means that the insert is single-sided and has 4 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 SSSCL 09 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 1.5–2.5 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 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 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 SSSCL 09
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 SCMT insert has positive geometry (clearance angle 7°), which means it is single-sided with 4 cutting edges. When one edge wears out, rotate the insert to a fresh edge.
Product accessories
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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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