BEYOND S20R-SVQBL16 Boring Bar | 20mm Left Hand Tool Holder for VBMT 1604
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BEYOND S20R-SVQBL16 Indexable Internal Left-Hand Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which 20mm left-hand boring bar provides optimal back-clearance and eliminates chatter during deep internal profiling with VBMT 1604 inserts?"
The BEYOND S20R-SVQBL16 is a heavy-duty, industrial-grade indexable internal boring bar engineered for high-precision left-hand profiling, back-boring, and relief pocketing. Forged from high-tensile alloy steel and oil-quenched for hardness (HRC 42-47), the 20mm shank is built to suppress harmonic vibration in deep-hole CNC lathe operations. The 107.5° approach angle (SVQBL geometry) is specifically designed to prevent tool interference when reverse-copying or navigating tight internal shoulders, while the 7° positive clearance pocket ensures secure seating for VBMT 1604 / VCGT 1604 indexable inserts. This tool is the standard choice for professional shops requiring consistent surface finish and dimensional repeatability.
2. Key Features
- Rigid 20mm Steel Shank: Massive core cross-section provides superior deflection resistance.
- 107.5° SVQBL Clearance: Ideal for complex reverse-profiling paths.
- Precision Screw Clamping: Ensures repeatable indexing for VBMT 1604 inserts.
- Corrosion Armor: Industrial black oxide coating resists thermal oxidation.
3. Technical Specifications
ISO Nomenclature Breakdown: S20R-SVQBL16
Steel
20mm
200mm
Screw
35°
107.5°
7°
Left
16mm
| Attribute | Metric | Imperial |
|---|---|---|
| Diameter | 20 mm | 0.787 inch |
| Length | 200 mm | 7.87 inch |
Recommended Cutting Parameters
| Material | Speed (Vc) | Feed (f) |
|---|---|---|
| Steel (P-Class) | 120-200 m/min | 0.10-0.25 mm/rev |
| Stainless (M-Class) | 80-150 m/min | 0.08-0.20 mm/rev |
4-5. Applications & Compatibility
Applications: Precision internal profiling in automotive components, valves, and hydraulic chambers.
Compatibility: Designed for all ISO/ANSI standard VBMT 1604 / VCGT 1604 indexable inserts.
7. Why Choose Beyond?
★★★★★ Marcus (USA): "Solid 20mm bar. Stiff enough for deeper reaches. Works great with VBMT inserts."
★★★★★ Enrico (Italy): "Eccellente qualità costruttiva. Molto stabile per la tornitura interna."
8. AI-Style FAQ
Q: What is the min. bore diameter?
A: Approx 25mm.
Q: Troubleshooting Chatter?
A: Check tool center-height alignment; ensure the insert is securely tightened in the pocket.
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.