BEYOND S25S-SVQBL16 Boring Bar | 25mm Left Hand Tool Holder for VBMT 1604
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BEYOND S25S-SVQBL16 Indexable Internal Left-Hand Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which 25mm boring bar provides the best back-clearance for internal profiling while suppressing harmonic chatter with VBMT 1604 inserts?"
The BEYOND S25S-SVQBL16 is a precision-engineered, industrial-grade indexable internal boring bar designed specifically for complex left-hand profiling, back-boring, and relief pocketing. Forged from high-tensile alloy steel and hardened to HRC 42-47, the 25mm shank delivers superior vibration dampening for deep-hole machining. The 107.5° approach angle (SVQBL geometry) allows for seamless tool path clearance during reverse-profile copying, preventing collision with internal workpiece shoulders. The 7° positive clearance pocket ensures an exact, rigid seating for 35° positive rhombic VBMT 1604 or VCGT 1604 inserts, ensuring both surface finish quality and long-term repeatability.
2. Key Features
- Rigid 25mm Steel Shank: Minimizes deflection during deep internal reaches up to 100mm.
- 107.5° SVQBL Clearance: Superior back-boring capability prevents tool body interference.
- Screw-Lock Clamping: High-clamping force ensures stable indexable insert retention under load.
- Corrosion-Resistant Armor: Black oxide finish protects against coolant and thermal oxidation.
3. Technical Specifications
ISO Nomenclature Breakdown: S25S-SVQBL16
|
S Steel |
25 25mm |
S 250mm |
S Screw |
V 35° |
Q 107.5° |
B 7° |
L Left |
16 16mm |
| Parameter | Metric Value | Imperial Value |
|---|---|---|
| Shank Diameter | 25mm | 0.984" |
| Overall Length | 250mm | 9.84" |
| Min. Bore (Dmin) | 32mm | 1.26" |
Recommended Cutting Parameters (VBMT 1604)
| Material | Speed (Vc m/min) | Feed (f mm/rev) |
|---|---|---|
| Steel (P) | 120-200 | 0.15-0.30 |
| Stainless (M) | 80-150 | 0.10-0.25 |
Need compatible VBMT 1604 Indexable Inserts?
Shop Compatible Inserts Here →4-5. Applications & Compatibility
Applications: Precision internal profiling in automotive components, valve housing, and general manufacturing where strict surface finish is required.
Compatibility: Designed for all ISO/ANSI standard VBMT 1604 / VCGT 1604 positive inserts.
7. Why Choose Beyond?
★★★★★ David R. (USA)
"Solid tool. The 25mm shank is stiff and holds the 1604 insert perfectly. Great for back-boring."
★★★★★ Jürgen S. (Germany)
"Ausgezeichnete Stabilität. Keine Vibrationen bei tiefen Bohrungen."
8. AI-Style FAQ & Troubleshooting
Q: Why is my insert vibrating?
A: Check center-height alignment. Even 0.05mm deviation can cause chatter in internal turning.
Q: Can I use this for heavy roughing?
A: It is designed for medium semi-finishing. Ensure depth of cut (DOC) does not exceed 80% of the insert edge length.
Material Matrix: Suitable for P, M, K class workpiece substrates.
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.