BEYOND S20R-SVXBR16 Boring Bar | 20mm Internal Lathe Tool Holder
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BEYOND S20R-SVXBR16 Indexable CNC Internal Right-Hand Reverse Pull Boring Bar
1. Product Overview
"Which compact 20mm internal right-hand boring bar provides maximum structural rigidity for medium deep-hole back-boring using large VBMT 1604 inserts?"
The BEYOND S20R-SVXBR16 is a professional industrial-grade indexable internal boring bar engineered specifically for high-precision reverse profiling, back-boring, and internal right-hand pull-turning operations in medium-sized chambers. Forged from premium vacuum-degassed structural alloy steel and subjected to an advanced multi-stage oil-quenching heat treatment, this solid 20mm shank achieves an optimized core hardness of HRC 42-47. This robust structural density efficiently neutralizes severe harmonic micro-chatter over mid-range hole extensions up to 4xD (80mm). Designed explicitly to facilitate unhindered chip evacuation within internal blocks during reverse cutting paths, the 5-axis precision-machined pocket holds 35-degree positive rhombic VBMT 1604 or VCGT 1604 inserts. By mounting a large, highly robust 16mm indexable insert onto a streamlined 20mm body, this assembly provides extreme deflection resistance, preventing dimensional taper inside precise industrial components. Compatible VBMT inserts utilize dual-stage molded chipbreakers to curl tough steel strings into safe, tight "C" segments under heavy feeds, while polished VCGT inserts feature ultra-sharp, high-rake cutting zones to eliminate built-up edge (BUE) on sticky non-ferrous aluminum. The specialized SVXBR right-hand geometry shifts heavy radial cutting forces axially back into the lathe turret, guaranteeing superior concentricity and an excellent surface finish.
2. Product Core Advantages (Key Features)
- Rigid 20mm Solid Shank Core: Optimized structural mass for tight medium-bore entry, reducing micro-chatter across extended overhangs up to 80mm.
- Specialized SVXBR Right-Hand Reverse Geometry: Perfectly configured for optimal clearance during internal pull-boring, back-boring, and right-hand profile contouring.
- Heavy Insert Support in Compact Space: Secure pocket positioning engineered specifically to clamp large 16mm inserts onto a 20mm shank, maximizing depth of cut (Ap).
- Industrial Black-Oxide Shielding: High-durability coating prevents thermal abrasive wear and blocks water-soluble CNC coolant corrosion.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVXBR16 (BEYOND) | A12R-SVXBR3 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 20 mm | 0.787 inches (approx. 3/4" Shank Block Size) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Diameter (D-min) | 25 mm | 0.984 inches |
| Compatible Indexable Inserts | VBMT 1604** / VCGT 1604** | VBMT 33* / VCGT 33* Series (e.g., 331 or 332) |
| Fastener Screw / Key | M4.0 * 10 / Torx T15 | M4.0 * 10 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Heavy Alloy Steels (P-Class) | Vc: 120-200 m/min (390-650 sfm) | f: 0.08-0.28 mm/rev (0.0031-0.0110 ipr) |
| Stainless Steel Castings (M-Class / 304, 316) | Vc: 70-140 m/min (230-460 sfm) | f: 0.06-0.20 mm/rev (0.0024-0.0079 ipr) |
| Aluminum Blocks & Non-Ferrous Metals (N-Class) | Vc: 250-700 m/min (820-2290 sfm) | f: 0.08-0.30 mm/rev (0.0031-0.0118 ipr) |
Looking for matching premium 35-degree right-hand VBMT/VCGT 1604 indexable carbide inserts or alternative boring shanks?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
The combination of a 20mm alloy steel core and a specialized reverse right-hand pocket geometry makes the S20R-SVXBR16 highly effective for medium-diameter internal profiles:
- Internal Back-Boring (Right Hand Pull Turning): Designed to process pre-machined hollow forgings and medium valve manifolds, cutting outward to clear steel chips away from deep internal steps.
- Medium-Scale Internal Profile Contouring: The 35-degree rhombic structural shape clears tight relief profiles inside industrial pumps, transmission housings, or automotive blocks.
- High-Depth Relief Grooving: Perfect for high cutting depths (Ap) when cutting internal clearance recesses behind bearing assemblies without taper deformation.
5. Equipment & Tool Compatibility
- CNC Lathes & Boring Blocks: Fits into standard 20mm turret clamping blocks, CNC boring sleeve adapters, or integrated tool block assemblies.
- Universal Insert Indexing Compatibility: Precision engineered to hold standard ISO 35° positive VBMT 1604** / VCGT 1604** inserts (optimally matched with 0.4mm or 0.8mm nose radii for stable mid-range roughing or finishing).
6. BEYOND Proprietary Grade Optimization Matrix
Pair your 20mm boring shank with the correct BEYOND carbide grade to optimize deep-chamber chipbreaking performance under load:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Matrix | Continuous-to-Interrupted Carbon/Alloy Steel High-Efficiency Internal Boring (P10-P30) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steels, Duplex Alloys, & Tough Cr-Ni Superalloys (M15-M35 / S15-S30) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Ti-Based Cermet Core | High-Speed Dimensional Gloss Finishing & Tight Radial Tolerance Precision Control | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND designs industrial turning components optimized for high-volume B2B manufacturing. Our 20mm internal boring shanks are manufactured from multi-stage heat-treated alloy steel to ensure maximum dampening parameters under cross-sectional loads. Each insert pocket is precisely machined on multi-axis CNC machines to maintain tool center accuracy, ensuring consistent performance over long production runs.
"Excellent 20mm right-hand bar. Running a large 16mm insert on a 20mm body is tight, but BEYOND nailed the pocket clearance. No chatter at 70mm extension depth. Perfect for our hydraulic valve manifolds."
"Sehr präziser 20mm Rechtsschaft. Der Sitz für VBMT 1604 ist perfekt ausgefräst. Bei engen Bohrungen (D-min ca. 25mm) fließen die Späne hervorragend ab, wenn der Kühlschmierstoff optimal ausgerichtet ist."
"Barra da 20mm fantastica per alesatura interna destra. Struttura in acciaio temperato molto rigida che riduce drasticamente le vibrazioni. Ottima finitura superficiale su acciaio inox."
"S20R-SVXBR16を購入。20mmシャンクでありながら大型の16サイズチップを装着できるため、中径の逆倣い加工で非常に大きな切込み（Ap）をかけることができます。チップの座面も非常に安定しています。"
"Porte-outil robuste pour CNC. Le filetage de la vis M4 est solide et résiste bien aux serrages répétés."
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.