BEYOND S25S-SVJCL16 Boring Bar | 25mm Left Hand CNC Turning Tool Holder
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BEYOND S25S-SVJCL16 Heavy-Duty Indexable CNC Left-Hand Deep Boring Bar
1. Product Overview
"Which 25mm left-hand anti-vibration boring bar is best engineered to eliminate chatter during deep-bore internal profiling using robust VCMT 1604 or VCGT 1604 inserts?"
The BEYOND S25S-SVJCL16 is an industrial-grade, heavy-duty left-hand indexable internal boring bar engineered for demanding profiling, counterboring, and medium-to-rough internal turning inside larger cavities. Forged from premium solid structural alloy steel and treated with a multi-stage oil quenching matrix, this 25mm rigid shank achieves a core hardness of HRC 42-47. This substantial mass structure suppresses low-frequency harmonic resonance and completely isolates micro-chatter over critical overhang reaches up to 4xD. The pocket assembly is ground using precise 5-axis machining stations to ensure flawless, secure nesting for 35-degree positive rhombic indexable inserts with a 7-degree relief profile. It is fully optimized for VCMT 1604 carbide inserts (featuring integrated molded chipbreakers for aggressive chip-splitting and smooth evacuation in long-chipping stainless or carbon steels) and VCGT 1604 polished inserts (featuring mirror-faced ground rakes that prevent built-up edge when slicing aluminum or non-ferrous alloys). Designed with a strategic 93-degree lead angle (SVJCL system), this left-hand holder forces cutting resistance axially along the shank length rather than radially, substantially reducing deflection and maximizing part circularity and size control.
2. Product Core Advantages (Key Features)
- 25mm High-Rigidity Steel Body: Provides massive core strength and stability for extended overhang lengths up to 250mm, resisting flex during high metal-removal operations.
- 93° SVJCL Lead Angle Architecture: Directs cutting force components downward towards the machine turret axis to aggressively combat radial tool deflection.
- Heavy 16mm Insert Pocket Foundation: Securely locks thick 1604 series inserts (4.76mm thickness) to handle elevated feed rates and variable depths-of-cut without insert shifting.
- Anti-Wear Hardened Black Oxide Layer: Protects against high-speed chip scouring, thermal oxidation, and abrasive wear under continuous industrial cutting.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVJCL16 (BEYOND) | A16S-SVJCL5 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 25 mm | 1.000 inch (1" Ultra-Rigid Heavy Duty Clamping 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 3.3* / VCGT 3.3* Series (e.g., 3.31 or 3.32) |
| 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: 140-250 m/min (460-820 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: 0.06-0.20 mm/rev (0.0024-0.008 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 300-800 m/min (980-2620 sfm) | f: 0.10-0.35 mm/rev (0.004-0.014 ipr) |
Looking for premium matching 35-degree VCMT/VCGT 1604 left-hand inserts or alternative boring shanks?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Engineered with a high-rigidity 25mm oil-quenched steel body matched to an extensive 16mm insert seat, the S25S-SVJCL16 dominates challenging internal cutting setups:
- Heavy-Duty Deep Internal Profiling: Specifically designed for left-hand trajectories or inverted spindle processing over extended depths, maintaining absolute tracking precision.
- 93° Square Shoulder Boring & Counterboring: The 93-degree SVJCL geometry tracks perpendicular blind shoulders flawlessly, pushing metal chips clean out of the cutting track.
- High-Feed Semi-Finishing to Roughing: Accommodates larger 1604 inserts with massive depths of cut (Ap up to 3.0mm) without breaking chip control or inducing severe structural vibration.
5. Equipment & Tool Compatibility
- Industrial CNC Turret Interface: Perfectly integrates into standard 25mm ID boring bar sleeves, heavy block holders, and large turning centers.
- Insert Family Versatility: Direct match for all universal 35-degree positive rhombic VCMT 1604** and VCGT 1604** indexable inserts. Accommodates standard nose radii from 0.4mm (160404) for crisp geometry up to 0.8mm (160408) for robust roughing edges.
6. BEYOND Proprietary Grade Optimization Matrix
Select the correct specialized BEYOND insert substrate grade to maximize chipbreaker 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 left-hand 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.
"Absolute tank of a bar. We run this 25mm left hand holder on heavy cylinder setups with a 100mm overhang. The 93 degree angle shifts all forces down the shank. Micro-chatter vanished and our VCMT 1604 inserts are lasting twice as long."
"Sehr massiver 25mm Schaft für tiefe Bohrungen. Der 93° Einstellwinkel reduziert die Radialkräfte spürbar, was bei langen Auskragungen entscheidend ist. Perfekter Sitz für 1604 Wendeplatten."
"Barra di alesatura sinistra eccezionale. Struttura pesante e stabilissima. L'evacuazione dei trucioli con l'inserto da 16mm è fluida anche su fori ciechi profondi."
"深穴の倣い加工用にS25S-SVJCL16を導入。25mmのクエンチング鋼シャンクは剛性が非常に高く、93度偏角のおかげで背分力が抑えられ、ビビリが完全に解消しました。1604チップの厚みもタフな切削に耐えてくれます。"
"Heavy structural bar that does exactly what it promises. Screw down design provides rigid insert tracking. Delivered quickly with premium torx hardware."
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.