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Description
DIAMETER Ø12 mm
LENGTH 125 mm
INSERT TCMT 1102rr
ANGLE κr 90°
Technical specifications of the S12 STFCR 11 boring bar
| Technical data | |
|---|---|
| ISO designation | S12 STFCR 11 |
| Shank diameter (d) | Ø12 mm |
| Effective height (h) | 11 mm |
| Overall length (L) | 125 mm |
| Functional overhang (f) | 10 mm |
| Min. bore diameter (D_min) | Ø16 mm |
| Entering angle (κr) | 90° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | TCMT 1102rr |
| Cutting direction | R — right-hand (L version available) |
| Shank material | Steel (S) |
| Manufacturer | Varel |
S12 STFCR 11 boring bar – for internal turning and bore finishing
Internal turning tool for machining bores from Ø16 mm
Boring bar S12 STFCR 11 is an indexable boring bar designed for longitudinal turning and bore finishing with diameters starting at 16 mm. The round steel shank with a diameter of Ø12 mm and a length of 125 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.
In the central screw clamping system (S), the screw secures the TCMT 1102rr 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 11 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the STFCR designation of the S12 STFCR 11 boring bar
What the individual letters in the ISO designation mean
Decoding the designation STFCR
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
F
ENTERING ANGLE
κr = 90°
Facing — right angle 90°
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: Ø12 mm (S12K, steel) · Insert: TCMT 1102rr
Typical applications of the S12 STFCR 11 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø16 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 90° angle allows machining the face inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
S12 STFCR 11 package contents
Package contents:
| ✓ | Boring bar body S12 STFCR 11 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | TCMT 1102rr cutting insert (sold separately) | — |
Compatible TCMT 1102rr insert
TCMT 1102rr
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 S12 STFCR 11 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 (48 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 — S12 STFCR 11
The minimum bore diameter is Ø16 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
For a steel shank of Ø12 mm, the recommended maximum overhang without damping is 4×d, or 48 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
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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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