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Description
DIAMETER Ø16 mm
LENGTH 170 mm
INSERT SCMT 0903rr
ANGLE κr 45°
Technical specifications of the S16 SSSCR 09 boring bar
| Technical data | |
|---|---|
| ISO designation | S16 SSSCR 09 |
| Shank diameter (d) | Ø16 mm |
| Effective height (h) | 15 mm |
| Overall length (L) | 170 mm |
| Functional overhang (f) | 13 mm |
| Min. bore diameter (D_min) | Ø21 mm |
| Entering angle (κr) | 45° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | SCMT 0903rr |
| Cutting direction | R — right-hand (L version available) |
| Shank material | Steel (S) |
| Manufacturer | Smoxh |
Boring bar S16 SSSCR 09 – for internal turning and finishing of bores
Internal turning tool for machining bores from Ø21 mm
Boring bar S16 SSSCR 09 is an indexable boring bar designed for longitudinal turning and bore finishing with diameters from 21 mm. The round steel shank, ø16 mm in diameter and 170 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 SSSCR designation of the S16 SSSCR 09 boring bar
What the individual letters in the ISO designation mean
Decoding the designation SSSCR
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
R
DIRECTION
Right-hand (R)
Feed to the left — from the tailstock toward the spindle
Shank: Ø16 mm (S16P, steel) · Insert: SCMT 0903rr
Typical applications of the S16 SSSCR 09 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø21 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 S16 SSSCR 09
Package contents:
| ✓ | Boring bar body S16 SSSCR 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 S16 SSSCR 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 (64 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 — S16 SSSCR 09
The minimum bore diameter is Ø21 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
For a steel shank of Ø16 mm, the recommended maximum overhang without damping is 4×d, or 64 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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