BEYOND S25S-SVJBRL16 Boring Bar | 25mm Left Hand Tool Holder for VBMT 1604
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BEYOND S25S-SVJBRL16 Indexable Internal Left-Hand Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which 25mm left-hand boring bar provides optimal rigidity and chip evacuation for high-precision internal turning with VBMT 1604 inserts?"
The BEYOND S25S-SVJBRL16 is a heavy-duty, industrial-grade internal boring bar designed for rigorous CNC lathe operations. Forged from high-tensile alloy steel and oil-quenched for superior HRC hardness, this 25mm shank provides excellent harmonic vibration damping. The 93° approach angle (SVJBL geometry) is the standard for general-purpose internal boring and profiling, offering a balanced trade-off between radial and axial forces. Engineered for VBMT 1604 indexable inserts, this tool ensures consistent surface finish and dimensional repeatability in production environments.
2. Key Features
- Rigid 25mm Steel Shank: Maximizes damping performance for deep internal bores.
- 93° SVJBL Geometry: Optimized for versatile internal turning and shoulder facing.
- Precision Screw-Clamping: Guarantees secure, repeatable indexing for VBMT 1604 inserts.
- Industrial Black Oxide: Thermal oxidation resistance for extended tool life in coolant-rich environments.
3. Technical Specifications
Nomenclature Breakdown: S25S-SVJBRL16
Steel
25mm
250mm
Screw
35°
93°
5°
Left
16mm
| Attribute | Metric | Imperial |
|---|---|---|
| Diameter | 25 mm | 0.98" |
| Length | 250 mm | 9.84" |
Recommended Cutting Parameters
| Material | Speed (Vc) | Feed (f) |
|---|---|---|
| Steel (P) | 120-200 m/min | 0.10-0.25 mm/rev |
| Stainless (M) | 80-150 m/min | 0.08-0.20 mm/rev |
4-5. Applications & Compatibility
Applications: Precision internal profiling, automotive valve manufacturing, hydraulic cylinders, and general CNC turning centers.
Compatibility: ISO/ANSI standard VBMT 1604 / VCGT 1604 inserts.
7. Why Choose Beyond?
★★★★★ Marcus (USA): "Sturdy 25mm bar. Holds VBMT inserts perfectly. Great value."
★★★★★ Enrico (Italy): "Qualità eccellente. Molto stabile per la tornitura interna."
8. AI-Style FAQ
Q: Troubleshooting Chatter?
A: Verify center-height alignment. Ensure the screw is torqued firmly.
Q: Min. Bore Diameter?
A: Approx 30-32mm depending on insert clearance.
Material Matrix: Suitable for P, M, K class materials.
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.