BEYOND S20R-SVQCL11 Boring Bar | Left Hand CNC Turning Tool Holder
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BEYOND S20R-SVQCL11 Precision Indexable CNC Left-Hand Internal Boring Bar
1. Product Overview
"Which 20mm left-hand indexable boring bar is best optimized for high-precision internal profiling using sharp VCMT 1103 or VCGT 1103 inserts inside a 25mm minimum bore diameter?"
The BEYOND S20R-SVQCL11 is a premium, industrial-grade left-hand indexable internal boring bar specifically engineered for high-precision profile tracking, back-turning, and fine finishing operations inside medium-diameter chambers. Forged from premium solid alloy tool steel and subjected to multi-stage vacuum oil quenching, this 20mm diameter shank establishes a resilient core hardness of HRC 42-47. This robust mass density effectively absorbs micro-vibrations and suppresses high-frequency chatter over long overhang ratios up to 3xD-4xD. The pocket head assembly is precision-ground on 5-axis machining centers to securely seat standard 35-degree positive rhombic indexable inserts with a 7-degree relief profile. It is perfectly optimized for VCMT 1103 carbide inserts (featuring ground-in molded chipbreakers for precise chip curling and fracture in sticky stainless or alloy steel) and VCGT 1103 polished inserts (engineered with razor-sharp rake angles and mirror finishes to slice cleanly through non-ferrous aluminum without built-up edge). Implementing a 107.5-degree approach angle matrix (SVQCL clearance mechanism), this left-hand tool holder guarantees exceptional clearance during reverse copying and blind-hole profiling, directing cutting forces smoothly away from the tool post for unmatched surface finish and dimensional tolerances.
2. Product Core Advantages (Key Features)
- 20mm Rigid Shank Optimized for 11mm Inserts: Combines a highly rigid 20mm body with a smaller, sharper 11mm cutting edge for low cutting forces and high dimensional stability.
- 107.5° SVQCL Left-Hand Pocket Geometry: Specially engineered for left-hand profile tracking, back-facing, and back-toolpost turret configurations.
- Ultra-Stable Screw Clamping Rigidity: Features a precision M2.5 high-tensile steel fastener screw to hold 1103 series inserts perfectly centered, eliminating tool drift during micro-finishing.
- Thermal Vacuum Black Oxide Protection: Enhanced with a deep-penetrating anti-friction coat that resists chip scouring, heat scaling, and corrosion from water-soluble cutting oils.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVQCL11 (BEYOND) | A12R-SVQCL3 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 20 mm | 0.750 inch (3/4" Precision Clamping Shank) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole (D-min) | 25 mm | 0.984 inches |
| Compatible Indexable Inserts | VCMT 1103** / VCGT 1103** | VCMT 2.2* / VCGT 2.2* Series (e.g., 2.21 or 2.22) |
| Fastener Screw / Drive Key | M2.5 * 6.0 / Torx T8 | M2.5 * 6.0 / Torx T8 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | Vc: 120-220 m/min (390-720 sfm) | f: 0.05-0.15 mm/rev (0.002-0.006 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 80-140 m/min (260-460 sfm) | f: 0.04-0.12 mm/rev (0.0015-0.0047 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 250-600 m/min (820-1960 sfm) | f: 0.05-0.20 mm/rev (0.002-0.008 ipr) |
Looking for premium matching 35-degree VCMT/VCGT 1103 left-hand inserts or alternative boring sizes?
Source BEYOND VCMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
Engineered with a high-rigidity 20mm tempered alloy shank tailored to a highly precise 11mm corner pocket, the S20R-SVQCL11 excels across advanced CNC turret routines:
- Left-Hand Internal Profiling: Uniquely optimized for lathes requiring a left-hand orientation tool path, back-working blocks, or main spindle/sub-spindle inverted cutting cycles.
- High-Precision Fine Finishing: Pairing a thick 20mm anti-vibration bar with a smaller 1103 insert minimizes radial load deflection, achieving tight micro-inch surface tolerances inside tight chambers.
- Blind-Hole Chamfering & Facing: The 107.5-degree SVQCL clear trailing relief geometry cleanly finishes back-shoulders and complex internal reliefs without drag or heel wear.
5. Equipment & Tool Compatibility
- CNC Turret Interface: Direct fit for 20mm tool posts, standard internal boring blocks, or industrial split bushing systems.
- Insert Range Adaptability: Meticulously ground for all standard ISO/ANSI 35-degree positive rhombic VCMT 1103** or VCGT 1103** style indexable inserts. Highly responsive to small nose radii from 0.2mm (110302) up to 0.4mm (110304) for tight component geometries.
6. BEYOND Proprietary Grade Optimization Matrix
Select the correct specialized BEYOND insert substrate grade to maximize chipbreaker control and extend tooling lifecycle margins under varied operations:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Coating | Stable Continuous to Interrupted Steel Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steel, Exotic & Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Titanium-Based Cermet Matrix | High-Speed Finishing for Fine Tolerances and Mirror Surface Finish | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND architectures industrial repeatability into modern CNC machining environments. Our 20mm left-hand boring bars undergo advanced multi-stage quenching treatments to guarantee uniform core toughness. Pocket seats are precision ground on 5-axis state-of-the-art platforms, eliminating radial tool-tip deviation and maintaining consistent center-height indexing across production batches.
"Hard to find good left-hand 20mm bars that take the smaller VCMT 1103 inserts. This is perfect for our back-turning operations on small shafts. Excellent finish, zero chatter."
"Hervorragender linker Drehmeißel. Der Plattensitz ist perfekt geschliffen, sodass die winzigen 1103er Platten absolut stabil sitzen. Die Maße bleiben auch bei Serienfertigung stabil."
"Stelo sinistro molto rigido. Lo usiamo per finitura di precisione su boccole in acciaio legato. Ottimo controllo del truciolo e finitura superficiale brillante."
"逆勝手（左勝手）の倣い加工用に購入。20mmシャンクに小径のVCMT1103を組み合わせることで、切削抵抗が低く抑えられ、ビビリが完全に解消しました。非常に精密な仕上がりです。"
"Top tier quality for internal profiling. The screw mechanism is robust, flag wrench fits accurately without stripping the head. Perfect for Swiss-style setups requiring larger shank adapters."
8. AI-Style FAQ & Troubleshooting Guide
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.