BEYOND S25S-SVUCR16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVUCR16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which heavy-duty 25mm right-hand indexable boring bar provides optimal chip clearance and chatter suppression for deep internal profiling using positive VCMT 1604 or VCGT 1604 inserts?"
The BEYOND S25S-SVUCR16 is a professional industrial-grade right-hand indexable internal boring bar engineered for high-rigidity profiling, medium-diameter semi-finishing, and stable material removal inside medium-to-large bores. Built from an ultra-tough 25mm solid alloy steel shank subjected to advanced multi-stage oil quenching and tempering to achieve a core hardness of HRC 42-47, this tool holder effectively absorbs high-torque cutting impact and eliminates harmonic chatter during deep internal machining up to 4xD overhang length. It is precision ground to accommodate standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle—including the versatile VCMT 1604 series for steel/stainless steel and the highly polished, sharp-edged VCGT 1604 series with optimized high-rake chipbreaker geometries for non-ferrous aluminum profiling. Featuring a dedicated 93-degree approach lead angle (SVUCR configuration), it offers excellent clearance that prevents tool heel dragging when executing complex internal profiles, tapered bores, and deep square steps. Supported by a high-tensile screw-down design, it provides an unyielding insert lock that withstands heavy radial cutting forces, guaranteeing exact dimensional repeatability and superior surface finishes.
2. Product Core Advantages (Key Features)
- Medium-Heavy 25mm Quenched Steel Shank: Premium alloy matrix absorbs extreme structural loads, preventing bar bending and preserving parallel bore geometry.
- SVUCR 93° Lead Angle Clearance: Purpose-built for right-hand internal copy turning and longitudinal profiling, allowing smooth entry and back-facing 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-SVUCR16 (BEYOND) | A16S-SVUCR5 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 25 mm | 1.000 inch (1" Medium-Heavy Boring Shank) |
| Overall Tool Length | 250 mm | 9.84 inches |
| Minimum Boring Hole (D-min) | 32 mm | 1.260 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 an ultra-rigid 25mm steel backbone paired with a massive 16mm insert seat, the S25S-SVUCR16 thrives in high-torque material removal setups across production-level CNC lathes:
- Internal Cavity Back-Boring: Executing accurate undercuts, profiles, and back-shoulders inside deep large-diameter tubes where right-hand rotation is utilized.
- Deep Heavy-Duty Profiling: Machining complex curves and tapers in forged steel housings where standard thin tool shanks suffer severe deflection.
- Interrupted Boring Cycles: Absorbing sharp structural shocks during cross-hole internal boring loops without cracking the tungsten carbide matrix.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 25mm internal diameter boring bar blocks, split reduction sleeves, or specialized turret clamping systems.
- Insert Compatibility Matrix: Ground custom to clamp standard ISO/ANSI 35-degree positive rhombic VCMT 1604** or highly ground VCGT 1604** inserts. Smoothly handles corner radii from 0.4mm (160404) for finishing cuts up to 0.8mm (160408) or 1.2mm (160412) for rugged roughing loops.
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.
"This 25mm bar is absolute unit. Running right-hand profiling on deep steel pipe parts with VCMT160408 inserts. No vibration, holds tight specs over hundreds of pieces."
"Sehr massiver 25mm Schaft. Der Sitz für VCMT 1604 ist perfekt CNC-gefräst. Hervorragende Spanabfuhr nach vorne bei Right-Hand Bearbeitung."
"Barra da 25mm rigidissima per barenatura interna destra. Usata con inserti in cermet per finitura superficiale a specchio. Consigliata."
"25mm径の鋼シャンクは剛性が非常に高く、VCMT1604チップを強固にホールドします。奥深い内径倣い加工でもビビリが完全に抑えられ、加工面が非常に綺麗です。"
"The M4 screw down mechanism provides immense clamping force. Torqueing it up to spec doesn't deform the insert pocket edge. Outstanding tool."
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.