BEYOND S25S-SVWCR16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVWCR16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which heavy-duty 25mm right-hand indexable boring bar provides optimal back-boring clearance and superior stability for high-feed profiling using 35-degree positive VCMT 1604 or VCGT 1604 carbide inserts?"
The BEYOND S25S-SVWCR16 is a premium, industrial-grade right-hand indexable internal boring bar engineered for demanding profiling, semi-finishing, and high-volume material removal inside large bores. Built from a robust 25mm solid alloy steel shank subjected to advanced multi-stage tempering to achieve a core hardness of HRC 42-47, this tool holder effectively dampens high-frequency harmonic vibrations and eliminates chatter during deep internal machining up to 4xD overhang. It is specifically designed to accommodate standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle—including the standard VCMT 1604 series and the free-cutting, polished ground VCGT 1604 aluminum profiling series. Featuring a dedicated 72.5-degree approach angle (SVWCR configuration), it offers an optimal clearance envelope that prevents heel-rubbing and catastrophic tool dragging when executing deep internal contouring, step profiles, and intricate undercuts. Supported by a high-tensile screw-down design, it provides an uncompromising insert lock that withstands extreme radial forces, guaranteeing precise dimensional repeatability and superior surface finishes.
2. Product Core Advantages (Key Features)
- Rigid 25mm Quenched Alloy Steel Shank: High-density steel construction drastically minimizes elastic deflection under heavy chip loads, extending insert tool-life and maintaining straightness.
- SVWCR 72.5° Lead Angle Envelope: Purpose-built for right-hand internal copy turning and longitudinal profiling, allowing smooth entry and exit into deep shoulders with minimal radial push.
- Precision CNC Ground Insert Seating Pocket: Mirror-milled pocket alignment holds VCMT/VCGT 1604 inserts with absolute spatial accuracy, eliminating center-height migration and protecting the delicate 35° nose radius.
- Thermal-Chemical Matte Black Coating: Premium industrial surface treatment provides superb chip-evacuation slickness, limits built-up edge (BUE) formation, and resists high-pressure coolant erosion.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVWCR16 (BEYOND) | A16S-SVWCR4 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 25 mm | 1.000 inch (1" Standard Boring Shank) |
| Overall Tool Length | 250 mm | 9.84 inches |
| Minimum Boring Hole (D-min) | 35 mm | 1.378 inches |
| Compatible Indexable Inserts | VCMT 1604** / VCGT 1604** | VCMT 33* / VCGT 33* Series (e.g., 331 or 332) |
| Fastener Screw / Drive Key | M4.0 * 10.0 / Torx T15 | M4.0 * 10.0 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | Vc: 140-240 m/min (460-785 sfm) | f: 0.08-0.25 mm/rev (0.003-0.010 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 90-160 m/min (295-525 sfm) | f: 0.06-0.18 mm/rev (0.0024-0.007 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 300-800 m/min (980-2620 sfm) | f: 0.08-0.30 mm/rev (0.003-0.012 ipr) |
Need premium matching 35-degree VCMT/VCGT inserts or alternative boring sizes?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Designed with a rigid 25mm steel backbone paired with a massive 16mm insert seat, the S25S-SVWCR16 thrives in heavy-duty structural metal removal setups across production-level CNC lathes:
- Internal Copy Profiling: Machining challenging internal profiles on large metal blanks where positive 35° VCMT inserts are preferred for low cutting forces and smooth chip fracture.
- High-Depth Step Boring: Turning crisp internal square shoulders and complex multi-diameter bores without facing structural chatter or tool taper.
- Medium-to-Rough Finishing Loops: Exploiting robust chip breaker geometries to fracture long, stringy chips inside deep steel bores, ensuring trouble-free automated operation.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 25mm ID internal turret blocks, direct tool clamps, or specialized split boring bar sleeves.
- Insert Compatibility Matrix: Custom ground to accept all standard ISO/ANSI 35-degree positive rhombic VCMT 1604** or high-rake VCGT 1604** inserts. Accommodates various corner radii from 0.4mm (160404) for finishing up to 0.8mm (160408) for roughing cuts.
6. BEYOND Proprietary Grade Optimization Matrix
Select the correct specialized BEYOND insert substrate grade to maximize chip breaker control and extend tooling lifecycle margins under varied operations:
| 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 architectures industrial repeatability into modern CNC machining environments. Our 25mm boring bars undergo advanced multi-stage quenching treatments to guarantee uniform core toughness. Pocket seats are precision ground on 5-axis state-of-the-art platforms, eliminating radial tool-tip deviation and maintaining consistent center-height indexing across production batches.
"Excellent 25mm bar for internal profiling. Running positive VCMT1604 inserts gives us a beautiful finish with almost zero chatter on deep bores. Solid build."
"Sehr stabiler 25mm Schaft. Der Plattensitz für VCMT 1604 ist perfekt gefräst. Späne fließen super ab und es gibt kein ratterndes Geräusch bei tiefen Bohrungen."
"Gambo da 25mm molto rigido. Usato con inserti VCGT lucidi per profilatura interna su alluminio. Prestazioni eccellenti, ottimo rapporto qualità-prezzo."
"VCMT1604チップの保持力が素晴らしいです。25mmの太いシャンクのおかげで、内径切削時のビビリが完全に止まりました。精度が出しやすいです。"
"The screw clamping mechanism is solid and handles heavy torque. The black oxide coating works nicely against synthetic emulsion coolants."
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.