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Description
DIAMETER Ø20 mm
LENGTH 200 mm
INSERT VBMT 1103rr
ANGLE κr 107.5°
Technical specifications of the S20 SVQBR 11 boring bar
| Technical data | |
|---|---|
| ISO designation | S20 SVQBR 11 |
| Shank diameter (d) | Ø20 mm |
| Effective height (h) | 18 mm |
| Overall length (L) | 200 mm |
| Functional overhang (f) | 14.5 mm |
| Min. bore diameter (D_min) | Ø25 mm |
| Entering angle (κr) | 107.5° |
| Clearance angle | 5° |
| Clamping system | ISO — center screw (S) |
| Insert type | VBMT 1103rr |
| Cutting direction | R — right-hand (L version available) |
| Shank material | Steel (S) |
| Manufacturer | Smoxh |
S20 SVQBR 11 boring bar – for internal turning and bore finishing
Internal turning tool for machining bores from Ø25 mm
Boring bar S20 SVQBR 11 is an indexable boring bar designed for longitudinal turning and bore finishing with diameters starting at 25 mm. The round steel shank with a diameter of Ø20 mm and a length of 200 mm ensures stable cutting even at longer tool overhangs. The geometry with an entering angle of 107.5° allows longitudinal turning and facing.
In the central screw clamping system (S), the screw secures the VBMT 1103rr insert through its hole, so only one screw needs to be loosened for replacement. The positive geometry of the 35° diamond insert with 2 cutting edges is well suited to finishing, providing low cutting forces and a smooth machined surface. The boring bar is compatible with VBMT 11 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the SVQBR designation of the S20 SVQBR 11 boring bar
What the individual letters in the ISO designation mean
Decoding the designation SVQBR
S
CLAMPING
Center screw (S)
The screw secures the insert through its center hole
V
INSERT SHAPE
35° rhombus 35°
VBMT insert — positive, single-sided, 2 edges
Q
ENTERING ANGLE
κr = 107.5°
Longitudinal turning + facing inside the bore
B
CLEARANCE ANGLE
α = 5°
Small clearance angle — high edge strength
R
DIRECTION
Right-hand (R)
Feed to the left — from the tailstock toward the spindle
Shank: Ø20 mm (S20R, steel) · Insert: VBMT 1103rr
Typical applications of the S20 SVQBR 11 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø25 mm |
| ▸ | Bore finishing — positive VBMT geometry provides low cutting forces and a smooth surface |
| ▸ | Internal taper turning — bearing seats, internal chamfers, Morse tapers |
| ▸ | Light facing — the 107.5° angle allows machining the face inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
Package contents for S20 SVQBR 11
Package contents:
| ✓ | Boring bar body S20 SVQBR 11 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | VBMT 1103rr cutting insert (sold separately) | — |
Compatible VBMT 1103rr insert
VBMT 1103rr
The cutting insert is not included in the set — must be purchased separately. VBMT insert. Positive geometry means that the insert is single-sided and has 2 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 S20 SVQBR 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 (80 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 (2 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 — S20 SVQBR 11
The minimum bore diameter is Ø25 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
For a steel shank of Ø20 mm, the recommended maximum overhang without damping is 4×d, or 80 mm. Above this value, vibration may occur — reduce the depth of cut or use a vibration-damped boring bar.
The VBMT insert has positive geometry (clearance angle 5°), which means it is single-sided with 2 cutting edges. When one edge wears out, rotate the insert to a fresh edge.
Product accessories
Carbide insert VBMT 110308 H6310 Horn
Reference: 0000011531 In stock > 10 items
€3.68
€4.53 brutto
Carbide insert VBMT 110304 H6310 Horn
Reference: 0000010092 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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