BEYOND S32T-SVXBL16 Boring Bar | 32mm Internal Lathe Tool Holder
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BEYOND S32T-SVXBL16 Heavy-Duty Indexable CNC Internal Left-Hand Reverse Pull Boring Bar
1. Product Overview
"Which heavy-duty 32mm internal left-hand boring bar provides maximum structural rigidity and chip evacuation for deep-hole back-boring using VBMT 1604 inserts?"
The BEYOND S32T-SVXBL16 is a professional industrial-grade indexable internal boring bar engineered specifically for high-torque reverse profiling, heavy back-boring, and internal left-hand pull-turning operations in large, deep chambers. Forged from premium vacuum-degassed structural alloy steel and subjected to an advanced multi-stage oil-quenching heat treatment, this solid 32mm shank achieves an optimized core hardness of HRC 42-47. This robust structural density efficiently neutralizes severe harmonic micro-chatter over deep-hole extensions up to 4xD (128mm) and beyond. Designed explicitly to facilitate unhindered chip evacuation within large 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 stable 32mm body, this assembly provides extreme deflection resistance, preventing dimensional taper inside precise heavy 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 SVXBL left-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)
- Ultra-Rigid 32mm Solid Shank Core: High structural mass and maximum deflection resistance, minimizing micro-chatter across extended deep-hole overhangs up to 128mm.
- Specialized SVXBL Left-Hand Reverse Geometry: Perfectly configured for optimal clearance during heavy internal pull-boring, back-boring, and left-hand profile contouring.
- Heavy-Duty Insert Support: Secure pocket positioning engineered specifically to clamp large 16mm inserts, withstanding aggressive depths 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 | S32T-SVXBL16 (BEYOND) | A20T-SVXBL3 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 32 mm | 1.260 inches (approx. 1-1/4" Shank Block Size) |
| Overall Tool Length | 300 mm | 11.81 inches |
| Minimum Boring Diameter (D-min) | 40 mm | 1.575 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: 140-220 m/min (460-720 sfm) | f: 0.10-0.35 mm/rev (0.0039-0.0138 ipr) |
| Stainless Steel Castings (M-Class / 304, 316) | Vc: 80-150 m/min (260-490 sfm) | f: 0.08-0.25 mm/rev (0.0031-0.0098 ipr) |
| Aluminum Blocks & Non-Ferrous Metals (N-Class) | Vc: 300-800 m/min (980-2620 sfm) | f: 0.10-0.40 mm/rev (0.0039-0.0157 ipr) |
Looking for matching premium 35-degree VBMT/VCGT 1604 indexable carbide inserts or alternative boring shanks?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
The combination of a maximum-rigidity 32mm alloy steel core and a specialized reverse left-hand pocket geometry makes the S32T-SVXBL16 highly effective for high-feed large-diameter internal profiles:
- Heavy Internal Back-Boring (Left Hand Pull Turning): Designed to process large pre-machined hollow forgings, cutting outward to clear heavy steel chips away from deep internal steps.
- Large-Scale Internal Profile Contouring: The large 35-degree rhombic structural shape clears deep relief profiles inside industrial oil valves, heavy cylinders, or aerospace housings.
- High-Depth Relief Grooving: Perfect for high cutting depths (Ap) when cutting internal clearance recesses behind large bearing assemblies without taper deformation.
5. Equipment & Tool Compatibility
- Heavy CNC Lathes & Boring Blocks: Fits perfectly into standard 32mm turret clamping blocks, heavy sleeve adapters, or large CNC boring block assemblies.
- Universal Insert Indexing Compatibility: Precision engineered to hold standard ISO 35° positive VBMT 1604** / VCGT 1604** inserts (optimally matched with 0.4mm, 0.8mm, or 1.2mm nose radii for heavy roughing or stable finishing).
6. BEYOND Proprietary Grade Optimization Matrix
Pair your heavy 32mm 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 32mm internal boring shanks are manufactured from multi-stage heat-treated alloy steel to ensure maximum dampening parameters under massive 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.
"Absolutely solid 32mm bar. We run this left-hand holder on our large CNC lathes for back-boring heavy structural tubes. Zero micro-chatter at 110mm depth of extension with VBMT 160408 inserts. Highly recommended for heavy industry shops."
"Sehr stabiler 32mm Schaft (Linksausführung). Der Plattensitz für VBMT 1604 ist extrem passgenau gefräst. Bei der Bearbeitung von legiertem Stahl brechen die Späne dank gutem Kühldruck perfekt. Keine Maßabweichungen bei Serienfertigung."
"Barra da 32mm eccezionale per alesatura e profilatura interna sinistra. Corpo in acciaio temperato rigidissimo che assorbe bene le vibrazioni anche con avanzamenti elevati. Ottimo rapporto qualità-prezzo."
"大型油圧シリンダー部品の内径逆倣い加工にS32T-SVXBL16を導入。左勝手（L）の大型32mmシャンクは剛性が抜群で、高送りでもビビリが一切発生しません。VBMT1604チップの座面も非常に安定しています。"
"Robust industrial tool holder. The pocket holds the 16mm insert firmly under repeated long-cycle heavy feeds."
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.