BEYOND S25S-SVXBL16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVXBL16 Left-Hand CNC Internal Turning Tool Holder
1. Product Overview
"Which heavy-duty left-hand boring bar is best engineered for rigid internal profiling and chatter-free deep hole turning using VBMT 1604 or VCMT 1604 35° diamond inserts in hardened steel?"
The BEYOND S25S-SVXBL16 is an industrial-grade, left-hand indexable internal boring bar explicitly engineered for intricate CNC lathe operations. Built with a premium, high-tensile quenched alloy steel shank, this professional tool holder features an optimized $93^\circ$ approach profile designed specifically for internal pocket profiling, back-boring, reverse copy turning, and clean counterboring. Engineered to securely seat standard 35° diamond indexable carbide cutting inserts—specifically the VBMT 1604__ / VCMT 1604__ series—it ensures superior structural rigidity and dimensional repeatability. The advanced pocket geometry provides maximum flank clearance and insert seat support, allowing complex chipbreaker geometries and micro-grain carbide substrates to achieve peak material removal rates without pocket deformation.
2. Product Core Advantages (Key Features)
- High-Rigidity Quenched Alloy Steel Shank: Undergoes strict thermal quenching to reach a core hardness of HRC 42–47. This delivers maximum fatigue resistance and suppresses harmonic vibration at overhang ratios up to 4xD.
- Streamlined SVXBL Chip Evacuation Pocket: The left-hand pocket orientation is precisely relieved to allow an unobstructed chip exit path, eliminating chip packing and surface scoring during deep internal sweeps.
- High-Torque Screw-Down Clamping System: Utilizes a specialized industrial Torx screw configuration that rigidly pulls the insert into its pocket, entirely eliminating micro-shifts under heavy mechanical loads.
- Anti-Wear Matte Finish: Treated with a professional-grade black oxide skin to provide long-lasting corrosion protection against aggressive water-soluble and synthetic cutting fluids.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVXBL16 (BEYOND) | A16R-SVXBL3.5 |
| Shank Diameter ($d$) | 25 mm | 1.000 inch (1") |
| Overall Tool Length ($L$) | 250 mm | 9.84 inches |
| Minimum Boring Hole ($D_{\min}$) | 32 mm | 1.260 inches |
| Compatible Indexable Inserts | VBMT 1604__ / VCMT 1604__ | VBMT 33_ / VCMT 33_ |
| Fastener Screw / Drive Key | M4.0 * 10 / Torx T15 | M4.0 * 10 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed ($v_c$) & Feed Speed ($f$) Pairs |
|---|---|
| Carbon Steels / Alloy Steels (P-Metal) | $v_c$: 140–230 m/min (460–750 sfm) | $f$: 0.10–0.25 mm/rev (0.004–0.010 ipr) |
| Stainless Steels (M-Metal / Duplex) | $v_c$: 90–160 m/min (295–525 sfm) | $f$: 0.08–0.20 mm/rev (0.003–0.008 ipr) |
| Grey / Nodular Cast Irons (K-Metal) | $v_c$: 120–200 m/min (390–650 sfm) | $f$: 0.12–0.28 mm/rev (0.005–0.011 ipr) |
Need premium matching indexable inserts or require a Right-Hand companion holder?
Source BEYOND® VBMT1604 Inserts & Right-Hand Toolbars Here →4. Industrial Application Scenarios
The substantial 25mm solid steel shank configuration balances exceptional structural mass with versatile neck clearance, making the left-handed S25S-SVXBL16 highly suitable for CNC lathe cells processing medium-to-large industrial applications, including:
- Internal Reverse Profiling: Precision finishing of internal profiles executed in back-turning or reverse spindle configurations.
- Industrial Subsea Valves: Profiling and contouring complex seating chambers inside stainless steel and alloy fluid valve housings.
- Heavy Gearbox Hub Manufacturing: Clean internal counterboring and multi-pass relief turning of large bearing sleeves and mechanical hub bores.
5. Equipment & Tool Compatibility
- CNC Machinery Integration: Mounts perfectly into metric 25mm bore toolholders, VDI/BMT static block turrets, or 1.000-inch standard engine lathe multi-tool posts using reduction sleeves.
- Indexable Tooling Cross-Compatibility: Pocket geometry is precision-ground to accept global industry variants of VBMT 160404, VBMT 160408, VCMT 160404, and VCMT 160408 indexable shapes.
6. BEYOND Proprietary Grade Optimization Matrix
To achieve maximum tool economy and high surface finish benchmarks, pair your SVXBL toolholder with the correct BEYOND proprietary coated carbide insert grade:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY8020 | PVD Multi-Nano AlTiN Coating | Stainless Steels & Heat-Resistant Alloys (M15–M30) | Sandvik GC1115 / Kennametal KC5010 |
| BY1030 | CVD Thick TiCN + Al2O3 Layer | High-Speed Continuous Carbon & Alloy Steel (P10–P25) | Sandvik GC4325 / Korloy NC3220 |
| BY4015 | Heavy CVD Alpha-Al2O3 Thermal Barrier | Grey Cast Iron & Ductile Iron rough-to-finish (K10–K20) | Sandvik GC4315 / Mitsubishi UC6110 |
7. Why Choose BEYOND Cutting Systems
At BEYOND, we specialize exclusively in state-of-the-art CNC metal cutting solutions. Our structural tool holder pockets are engineered on ultra-precise five-axis machining centers to achieve strict location tolerances, keeping axial runout minimal and ensuring absolute indexability when transitioning inserts mid-run.
"Finding reliable left-hand boring bars with precise pocket positioning can be a gamble, but this BEYOND bar is superb. We run reverse profiling inside tough 8620 gear forgings on our Haas lathe. Absolute structural rigidity, zero tool deflection."
"Ausgezeichnete Qualität. The screw seating alignment pulls the VBMT insert perfectly flush back into the corner walls. No micro-vibrations visible on deep 90mm overhang passes."
"Very clean chip clearance. The SVXBL body shape allows our high-pressure coolant stream to flush the strings straight out of the bore during reverse-facing programs."
"Excellent price and exceptional finishing consistency. The insert pocket tolerances match our highly expensive Japanese tooling setups perfectly."
"The black matte layer handles thermal shock well from heavy coolant sprays. Torx threads remain crisp after dozens of insert flips."
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.