BEYOND S20R-SVUCR11 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVUCR11 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which highly rigid 20mm right-hand indexable boring bar balances slim clearance with high-rigidity chatter suppression for internal profiling using positive VCMT 1103 or VCGT 1103 inserts?"
The BEYOND S20R-SVUCR11 is an engineered industrial-grade right-hand indexable internal boring bar designed for small-to-medium clearance copy turning, precision deep-hole semi-finishing, and stable internal profiling. Manufactured from premium solid alloy steel that undergoes multi-stage thermal hardening to reach a core toughness of HRC 42-47, this 20mm diameter bar offers superior resistance against cutting deflection and harmonic chatter at overhang ratios up to 4xD. It is meticulously machined to clamp standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle. This makes it an ideal match for the standard VCMT 1103 series (optimized with strong M-class chipbreakers for general steel chip control) and the ultra-sharp, mirror-polished VCGT 1103 series (featuring high-rake ground chipbreaker geometries to prevent chip nesting in non-ferrous aluminum alloys). Utilizing a 93-degree lead approach angle (SVUCR design), it guarantees an efficient backward chip evacuation path during right-hand operations, preventing catastrophic chip re-cutting on delicate internal bore surfaces. Backed by a secure high-tensile screw-lock system, it ensures exceptional insert indexing repeatability across intense CNC lathe production cycles.
2. Product Core Advantages (Key Features)
- Optimized 20mm Heat-Treated Shank: Quenched alloy construction delivers high toughness, minimizing structural deflection inside tight bores.
- 93° SVUCR Lead Angle Configuration: Tailored for right-hand internal profiling, taper turning, and copying without tool heel rubbing.
- Precision-Milled Insert Seating Pocket: Processed on 5-axis CNC machining centers to ensure a perfect insert fit, protecting the 11mm cutting edge from micro-movements.
- Industrial Black Oxide Finish: Enhances chip flow slickness, provides excellent corrosion resistance, and extends the operational life of the holder.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVUCR11 (BEYOND) | A12R-SVUCR3.5 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 20 mm | 0.750 inch (3/4" Precision Boring Shank) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole (D-min) | 24 mm | 0.945 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: 0.05-0.18 mm/rev (0.002-0.007 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 80-150 m/min (260-490 sfm) | f: 0.04-0.12 mm/rev (0.0016-0.0047 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 250-700 m/min (820-2300 sfm) | f: 0.05-0.20 mm/rev (0.002-0.008 ipr) |
Looking for premium matching 35-degree VCMT/VCGT inserts or alternative boring sizes?
Source BEYOND VCMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
Engineered with a balanced 20mm steel body and a highly detailed 11mm insert seat pocket, the S20R-SVUCR11 excels in precision internal processing cycles on automated CNC equipment:
- Internal Shoulder Front-Boring: Allows efficient forward toolpaths to clear face shoulders and internal geometries where a right-hand orientation is required.
- Precision Profiling & Contouring: Replicates intricate internal curves and complex profiles with high accuracy, minimizing deflection under axial loads.
- Semi-Finish Boring: Ideal for machining clean internal cylinders out of cast iron, steel housings, or alloyed blocks prior to final honing.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 20mm internal diameter boring bar holders, split bushings, or standard turret clamping systems.
- Insert Compatibility Matrix: Accommodates standard ISO/ANSI 35-degree positive rhombic VCMT 1103** or VCGT 1103** inserts. Handles corner radii from 0.2mm (110302) for super fine finishing up to 0.4mm (110304) for general purpose cutting loops.
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 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.
"Outstanding 20mm shank for internal right-hand profiling. We swapped a competitor bar out for this S20R-SVUCR11 and our surface roughness dropped drastically. No chatter at 3.5xD length."
"Sehr präziser Plattensitz für VCMT 1103. Keine Mikrobewegungen der Wendeplatte bei unterbrochenem Schnitt. Absolut empfehlenswert."
"Ottimo barenatore destro da 20mm. Lo usiamo su torni CNC verticali per profilatura interna di leghe di acciaio. Buona evacuazione dei trucioli."
"剛性が非常に高く、VCMT1103チップとの組み合わせで内径切削が非常に安定します。ネジの精度も高く、チップ交換時のセンター高さのズレがありません。"
"The small 11mm insert size allows excellent internal contouring flexibility. Fast delivery and high-grade finishing."
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.