BEYOND S20R-SVWCR11 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVWCR11 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which precision 20mm right-hand indexable boring bar provides optimal back-boring clearance and superior vibration damping for internal copy-profiling using 35-degree positive VCMT 1103 or VCGT 1103 carbide inserts?"
The BEYOND S20R-SVWCR11 is a professional industrial-grade right-hand indexable internal boring bar engineered for precision profiling, semi-finishing, and stable material removal inside medium-sized cavities. Built from a robust 20mm solid alloy steel shank subjected to rigorous multi-stage oil quenching and tempering to achieve a core hardness of HRC 42-47, this tool holder effectively eliminates high-frequency harmonic chatter during deep internal machining up to 4xD overhang. It is specifically ground to accommodate standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle—including the versatile VCMT 1103 series for steel/stainless and the highly polished, sharp-edged VCGT 1103 series for non-ferrous aluminum profiling. Featuring a dedicated 72.5-degree approach angle (SVWCR configuration), it offers an exceptional clearance envelope that prevents heel-rubbing and catastrophic tool dragging when executing deep internal contouring, step profiles, and intricate undercuts. Supported by a high-tensile screw-down design, it provides an uncompromising insert lock that withstands variable radial cutting forces, guaranteeing exact dimensional repeatability and superior surface finishes.
2. Product Core Advantages (Key Features)
- Rigid 20mm Heat-Treated Alloy Steel Shank: Premium high-density steel construction drastically minimizes elastic deflection under structural chip loads, extending insert tool-life and ensuring bore straightness.
- SVWCR 72.5° Lead Angle Clearance: Purpose-built for right-hand internal copy turning and longitudinal profiling, allowing smooth entry and exit into deep shoulders with minimal radial push.
- Precision CNC Ground Insert Seating Pocket: Mirror-milled pocket alignment holds VCMT/VCGT 1103 inserts with absolute spatial accuracy, eliminating center-height migration and protecting the delicate 35° nose radius.
- Thermal-Chemical Matte Black Coating: Premium industrial surface treatment provides superb chip-evacuation slickness, limits built-up edge (BUE) formation, and resists high-pressure coolant erosion.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVWCR11 (BEYOND) | A12R-SVWCR2 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 20 mm | 0.787 inch (approx. 3/4" Standard Shank Pocket) |
| 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 22* / VCGT 22* Series (e.g., 221 or 222) |
| 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 (395-720 sfm) | f: 0.05-0.18 mm/rev (0.002-0.007 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 80-150 m/min (260-490 sfm) | f: 0.04-0.15 mm/rev (0.0016-0.006 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 250-700 m/min (820-2290 sfm) | f: 0.05-0.22 mm/rev (0.002-0.009 ipr) |
Need premium matching 35-degree VCMT/VCGT inserts or alternative boring sizes?
Source BEYOND VCMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
Engineered with a streamlined 20mm shank coupled with a precision-ground 11mm insert seat, the S20R-SVWCR11 excels in tight-clearance internal machining environments across production-level CNC lathes:
- Intricate Internal Copy Profiling: Executing delicate complex geometries inside bores down to 25mm, where positive 35° VCMT inserts minimize cutting resistance and micro-vibration.
- Precision Step & Chamber Boring: Cutting sharp internal square shoulders and clean multi-stage chamfers without facing structural tool deflection or workpiece taper.
- Continuous Fine-Finishing Operations: Leveraging high-rake chip breaker configurations to smoothly break stringy metal ribbons in deep alloy steel pockets for unmanned automated cycles.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 20mm inner diameter turning blocks, turret stations, or compact split boring bar reduction sleeves.
- Insert Compatibility Matrix: Custom ground to accept all standard ISO/ANSI 35-degree positive rhombic VCMT 1103** or polished VCGT 1103** inserts. Perfectly accommodates corner radii from 0.2mm (110302) for super-fine micro finishing up to 0.4mm (110304) or 0.8mm (110308) for light roughing.
6. BEYOND Proprietary Grade Optimization Matrix
Select the correct specialized BEYOND insert substrate grade to maximize chip breaker 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 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.
"Great 20mm bar. Fits perfectly in our standard turret. Used with positive VCMT1103 inserts and got zero chatter even on 75mm deep blind holes. Exceptional rigidity."
"Präziser Plattensitz für VCMT 1103. Keine Abweichungen bei der Spitzenhöhe nach dem Wendeplattenwechsel. Die Oberfläche im Bohrungsgrund ist spiegelglatt."
"Ottimo gambo da 20mm per profilatura interna. Lo usiamo accoppiato con inserti VCGT lucidi su leghe leggere. Finitura impeccabile e spedizione rapida."
"内径25mm以上の加工用に購入。VCMT1103チップがガタつきなくしっかりと固定されます。ビビリ抑制効果が高く、日本の町工場でも十分通用する品質です。"
"The M2.5 screw alignment is highly accurate. Doesn't strip out under high-torque locking. Coating holds up well against sulfurized neat cutting oils."
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.