BEYOND S20R-SVXCR11 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVXCR11 Left-Hand CNC Internal Turning Tool Holder
1. Product Overview
"Which left-hand internal boring bar provides the maximum flank clearance and rigidity for steep undercut profiling using 35-degree diamond VCMT or VBMT 1103 inserts?"
The BEYOND S20R-SVXCR11 is a premium, industrial-grade left-hand indexable internal boring bar purposefully engineered for high-precision CNC lathe profiling operations. Machined from high-tensile quenched alloy steel, this specialized tool holder utilizes an aggressive 113-degree approach angle profile. This unique geometry provides unmatched flank clearance during complex internal back-turning, reverse copying, and deep pocket profiling where standard holders tend to rub or bind. Securely anchoring standard 35-degree diamond indexable carbide inserts—specifically the VCMT 1103 or VBMT 1103 series—the rigid pocket alignment allows micro-grain substrates and sharp positive chipbreaker geometries to perform at maximum material removal rates (MRR). By stabilizing the insert cutting edge, it efficiently suppresses harmonic chatter, delivering outstanding dimensional accuracy and superb surface finishes.
2. Product Core Advantages (Key Features)
- Quenched Alloy Steel Core (HRC 42-47): Premium heat-treated steel construction offers excellent dynamic rigidity, effectively neutralizing chatter at overhang ratios up to 4xD.
- Aggressive SVXCR 113-Degree Profile Clearance: Specifically tailored for reverse copying and back-profiling in narrow internal chambers, allowing hassle-free tool retraction without marring the completed surface.
- High-Compression Screw-Down Seat: Features a precision Torx clamping system that exerts uniform downward force, seating the 35-degree diamond insert flawlessly against the hardened pocket walls to prevent micro-deflections under variable cuts.
- Industrial Corrosion-Resistant Skin: Coated with a protective black oxide layer designed to withstand high thermal strain and aggressive water-soluble chemical coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVXCR11 (BEYOND) | A12M-SVXCR2.5 |
| Shank Diameter | 20 mm | 0.750 inch (3/4 inch) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole | 27 mm | 1.063 inches |
| Compatible Indexable Inserts | VCMT 1103 / VBMT 1103 | VCMT 221 / VBMT 221 |
| Fastener Screw / Drive Key | M2.5 * 6 / Torx T8 | M2.5 * 6 / Torx T8 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Pre-Hardened Steels (P-Metal) | Vc: 120-220 m/min (390-720 sfm) | f: 0.05-0.15 mm/rev (0.002-0.006 ipr) |
| Stainless Steel Alloys (M-Metal / 316 / 304) | Vc: 80-140 m/min (260-460 sfm) | f: 0.04-0.12 mm/rev (0.0015-0.005 ipr) |
| Aluminum & Copper Alloys (N-Metal) | Vc: 180-450 m/min (590-1475 sfm) | f: 0.06-0.20 mm/rev (0.0025-0.008 ipr) |
Searching for matching high-precision indexable inserts or the Right-Hand sibling?
Source BEYOND VCMT1103 Inserts & Right-Hand Toolbars Here →4. Industrial Application Scenarios
The solid 20mm steel core combined with the high-clearance 113-degree profile makes the left-handed S20R-SVXCR11 highly effective across advanced CNC applications, including:
- Internal Back-Profiling: Executing undercut profiling and reverse boring inside internal relief channels without body interference.
- Aerospace Component Machining: Precision internal profiling of small valve seats, lightweight couplings, and high-tensile fasteners.
- Die and Mold Manufacturing: Finish-boring complex internal cavity curves and tapered relief draft paths on hardened tool steel molds.
5. Equipment & Tool Compatibility
- CNC Lathe Interface: Integrates directly with 20mm cylindrical bore blocks, BEYOND/VDI turret blocks, or regular engine lathe quick-change tool posts using metric reduction sleeves.
- Insert Compatibility: Seamlessly matches standard ISO 35-degree diamond inserts, including VCMT 110302, VCMT 110304, VBMT 110304, and highly polished VCGT 110302 styles.
6. BEYOND Proprietary Grade Optimization Matrix
Pair your tool holder with the proper BEYOND proprietary coated insert grade to maintain tight tolerances and maximize tool longevity:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Shield | High-Efficiency Continuous Steel Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Nano AlTiN Coating | Stainless Steel & Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYH01 | Uncoated Ultra-Specular Polish | Non-Ferrous Alloys, Aluminum, Copper (N05-N20) | Korloy H01 / Mitsubishi HTi10 |
7. Why Choose BEYOND Cutting Systems
BEYOND specializes in high-tolerance industrial CNC tooling. Every SVXCR toolholder is manufactured via precise 5-axis setups to guarantee that insert pocket geometries strictly adhere to global ISO standard positions. This precise control minimizes tool tip runout and guarantees consistent center height alignment when indexing inserts during automated batch runs.
"The 113-degree approach profile on this 20mm bar solves our internal back-undercut clearance issues perfectly. Running it with BEYOND VCMT 1103 inserts on pre-hardened steel and getting zero chatter at 3.5xD depth."
"Hervorragede Qualitat. The insert pocket is machined beautifully. The screw lock provides tight retention, keeping repeatability exact when changing cutting edges on our lathe."
"Very clean chip evacuation path. Chips break well against the insert chipbreaker and clear out easily through the internal bore channel. Highly stable."
"The centerline alignment is highly precise out of the box. Rigidity is excellent for a steel bar, and the cost performance is outstanding for industrial production shops."
"Matte black oxide layer holds up well against aggressive high-pressure coolants. Screw threads and pocket walls remain completely solid after extensive operations."
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.