BEYOND S20R-SVZCL11 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVZCL11 Left-Hand Indexable CNC Internal Boring Bar
1. Product Overview
"Which left-hand 20mm internal boring bar provides high structural rigidity and exceptional clearance for tracing tight internal profiles using 35-degree VCMT or VBMT 1103 indexable inserts?"
The BEYOND S20R-SVZCL11 is a commercial-grade, high-rigidity left-hand indexable internal boring bar designed for tight-tolerance profiling, undercutting, and internal turning operations on CNC lathes. Vacuum heat-treated to an optimized structural hardness, this 20mm diameter alloy steel tool holder minimizes mechanical deflection and absorbs high-frequency vibrations across standard deep-hole overhang extensions up to 4xD. This boring bar is explicitly engineered to clamp narrow 35-degree rhombic indexable inserts, specifically the VCMT 1103 and VBMT 1103 series. By matching a 35° diamond insert profile with a 93-degree approach angle, this specialized SVZCL geometry provides supreme flank clearance. This allows operators to easily execute steep reverse profiles, back-boring cycles, and intricate internal necking contours where standard 55° or 80° turning bars would suffer heavy heel rub. Armed with a precision top-screw down clamping assembly, it ensures stable insert seating under fluctuating chip loads, maintaining tight dimensional repeatability and delivering exceptional surface finishes.
2. Product Core Advantages (Key Features)
- Quenched Carbon Alloy Steel Construction (HRC 42-47): Premium vacuum heat-treated tool steel provides the structural stiffness needed to prevent chatter during extended-reach internal boring operations.
- SVZCL 93-Degree Left-Hand Clearance Profile: Specifically optimized for reverse profiling and deep internal contours. The narrow 35° geometry allows the tool to clear complex shoulders without dragging.
- Precision CNC Milled Pocket Seating: Flawlessly machined pocket walls maximize surface contact with VCMT/VBMT inserts, minimizing micro-movement and protecting against premature edge chipping.
- Industrial Black Oxide Protective Finish: Durable chemical coating prevents rust and resists chip welding when machining gummy materials or running high-temperature dry cuts.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVZCL11 (BEYOND) | A12R-SVZCL2 (Standard Inch Style) |
| Shank/Clamping Diameter | 20 mm | 0.750 inch (3/4" Round Boring Bar) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole (D-min) | 25 mm | 0.984 inch |
| Compatible Indexable Inserts | VCMT 1103** / VBMT 1103** | VCMT 22* / VBMT 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: 130-240 m/min (425-780 sfm) | f: 0.05-0.15 mm/rev (0.002-0.006 ipr) |
| Stainless Steel Alloys (M-Class / 304) | Vc: 90-160 m/min (295-525 sfm) | f: 0.04-0.12 mm/rev (0.0016-0.0047 ipr) |
| Aluminum & Copper Alloys (N-Class) | Vc: 180-400 m/min (590-1310 sfm) | f: 0.05-0.18 mm/rev (0.002-0.007 ipr) |
Looking for high-performance matching left-hand VCMT/VBMT 1103 inserts or alternative sizes?
Source BEYOND VCMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
Designed with a compact yet robust 20mm shank footprint, the S20R-SVZCL11 excels in precision machining settings on CNC lathes and automated turning centers:
- Left-Hand Internal Profiling: Tracing complex inside radii, steep tapers, and tight geometric transitions down to a 25mm minimum hole diameter.
- Reverse Back-Boring & Relief Cuts: Reaching past internal shoulders to machine rear faces and face relief grooves without shank dragging.
- Small Component Components: Ideal for manufacturing hydraulic manifold tracks, precise transmission sleeves, and aerospace couplers.
5. Equipment & Tool Compatibility
- CNC Tool Post Clamping: Mounts securely into standard 20mm round boring bar holders, split bushings, modular block clamps, or standard lathe turret blocks.
- Insert Standardization: Universally compatible with all standard 35° diamond profile inserts, accepting VCMT 110302, VCMT 110304, VBMT 110304, and mirror-polished ground VCGT inserts for non-ferrous fine-finishing cycles.
6. BEYOND Proprietary Grade Optimization Matrix
Pair your left-hand tool holder with the correct BEYOND specialized insert grade to guarantee smooth chip-breaker performance and maximum tool lifecycle margins:
| 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 is dedicated to building structural reliability into high-performance CNC machining workflows. Our S20R-SVZCL11 boring bars are ground on high-accuracy 5-axis platforms to guarantee the pocket seating angle matches standard ISO positions. This tight manufacturing tolerance minimizes radial tool-tip runout and secures accurate tool center-height positions during automated cell changeovers.
"Needed a solid 20mm left-hand bar for a back-boring line on our turning center. This thing fits the VCMT 1103 perfectly. Zero chatter at 75mm stick out."
"Tolle Verarbeitung. Der Plattensitz ist exakt gefräst. Die linke Ausführung läuft einwandfrei bei unseren Rückwärts-Profilierungszyklen."
"Ottimo stelo in acciaio, molto rigido. L'angolo a 93 gradi evita lo sfregamento sul raggio interno. Spedizione rapida."
"左勝手の内径ボーリングバイトとして非常に優秀。20mm径ながら剛性が高く、VCMTチップがしっかりと固定されます。仕上げ面が綺麗。"
"The black oxide skin holds up perfectly against heavy water-soluble coolant. Swapping out worn inserts is quick and repeatable."
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.