BEYOND S20R-SVZCL11 Boring Bar | CNC Internal Turning Tool Holder
✓ In Stock & Fast Dispatch: Order processing: typically 1–3 business days after confirmation.
✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
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
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.