BEYOND S25S-SVQCL16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S25S-SVQCL16 Left-Hand CNC Internal Turning Tool Holder
1. Product Overview
"Which industrial left-hand boring bar provides the best chip clearance and structural rigidity for internal copy turning and deep hole profiling using 35° VCMT or VBMT 1604 inserts?"
The BEYOND S25S-SVQCL16 is a premium, heavy-duty left-hand indexable internal boring bar engineered for high-precision CNC lathe environments. Manufactured from high-tensile, quenched alloy steel, this tool holder is designed with a specialized $107.5^\circ$ approach angle profile. This unique geometry makes it highly effective for internal face profiling, reverse copy turning, and blind hole processing where maximum flank clearance is required. It provides an exceptionally secure pocket seat for standard 35° diamond indexable carbide cutting inserts—specifically the VCMT 1604__ / VBMT 1604__ series. By minimizing structural vibration and optimizing the insert pocket angle, it allows micro-grain carbide substrates and advanced chipbreaker geometries to function at peak material removal rates (MRR) without chipping.
2. Product Core Advantages (Key Features)
- Quenched Alloy Steel Shank (HRC 42–47): Undergoes advanced vacuum heat treatment to maximize core strength, offering exceptional resistance to deflection and harmonic chatter at overhang depths up to 4xD.
- Optimized SVQCL $107.5^\circ$ Pocket Clearance: Specifically engineered to allow rapid evacuation of hot chips during tight internal profiling passes, preventing chip recutting and preserving surface finishes.
- High-Torque Screw-Down System: Uses a precision Torx screw design that exerts uniform downward force, pulling the insert firmly into the pocket walls to ensure zero displacement under heavy mechanical impact.
- Industrial Black Oxide Skin: Treated with an anti-wear matte coating providing maximum corrosion resistance against modern water-soluble and synthetic cutting fluids.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVQCL16 (BEYOND) | A16R-SVQCL3.5 |
| 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 | VCMT 1604__ / VBMT 1604__ | VCMT 33_ / VBMT 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) | $v_c$: 140–240 m/min (460–780 sfm) | $f$: 0.08–0.22 mm/rev (0.003–0.009 ipr) |
| Stainless Steels (M-Metal / Duplex) | $v_c$: 90–170 m/min (295–550 sfm) | $f$: 0.06–0.18 mm/rev (0.002–0.007 ipr) |
| Grey / Nodular Cast Irons (K-Metal) | $v_c$: 120–210 m/min (390–690 sfm) | $f$: 0.10–0.25 mm/rev (0.004–0.010 ipr) |
Looking for original matching indexable inserts or a Right-Hand version?
Source BEYOND® VCMT1604 Inserts & Right-Hand Toolbars Here →4. Industrial Application Scenarios
The heavy-duty 25mm solid steel core makes the left-handed S25S-SVQCL16 highly versatile for CNC lathe workflows processing rigorous industrial workpieces, including:
- Internal Pocket Profiling: Precision finishing of internal profiles featuring steep shoulders or undercuts where a left-hand $107.5^\circ$ clearance path is mandatory.
- Automotive Transmissions: High-efficiency internal turning of hardened carbon steel ring gears, bearing seats, and hub housings.
- Oil & Gas Couplings: Machining complex internal step profiles and seal chambers inside thick-walled alloy tubes and pipeline components.
5. Equipment & Tool Compatibility
- CNC Machine Adaptation: Mounts natively in metric 25mm bore blocks, standard VDI/BMT driven or static turret holders, or standard engine lathe tool posts using suitable reducing bushes.
- Insert Standardization: Precision-ground seat accommodates industry-standard indexable inserts from major brands, including VCMT 160404, VCMT 160408, VBMT 160404, and VBMT 160408 shapes.
6. BEYOND Proprietary Grade Optimization Matrix
To achieve optimum tool economy and high surface finish benchmarks, pair your SVQCL toolholder with the correct BEYOND proprietary coated carbide insert grade:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Layer | High-Speed Continuous Carbon & Alloy Steel (P10–P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Nano AlTiN Coating | Stainless Steels & Superalloys (M15–M30 / S15–S25) | Sandvik GC1115 / Kennametal KC5010 |
| 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
BEYOND is dedicated to manufacturing industrial-grade CNC tooling. Our bars are machined on high-precision 5-axis setups to guarantee that insert pocket seats match global ISO tolerances. This limits runout, maintains exact tool center height, and allows effortless insert indexing mid-batch.
"The left-hand $107.5^\circ$ approach angle on this toolholder provides excellent clearance for internal profiling work. Running it on 4140 steel plates with BEYOND VCMT inserts, we have noticed excellent tool life and no pocket wear."
"Sehr gut verarbeitet. The Torx screw holds the 35-degree diamond insert very securely. Excellent repeating accuracy when changing the insert cutting edges during high-volume production."
"Great chip evacuation path. Chips break cleanly against our insert geometry and blow straight out of the internal bore without packing or scratching the wall."
"Highly precise dimensions. The shank tolerance fits our block tightly. Price-to-performance ratio is outstanding compared to traditional premium local suppliers."
"The black oxide layer holds up well under heavy synthetic fluid pressure. Torx thread remains robust after multiple insert indexing cycles."
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.