BEYOND S32T-SVQBL16 Boring Bar | 32mm Left Hand Tool Holder for VBMT 1604
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BEYOND S32T-SVQBL16 Indexable CNC Internal Left-Hand Profiling Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which heavy-duty 32mm left-hand boring bar provides maximum back-clearance and suppresses deep-hole chatter during 107.5-degree internal profiling with VBMT 1604 inserts?"
The BEYOND S32T-SVQBL16 is a heavy-duty, industrial-grade indexable internal boring bar engineered for high-stiffness left-hand profiling, back-boring, and 107.5-degree relief pocketing inside large bore geometries. Forged from ultra-grade tensile alloy structural steel and oil-quenched to HRC 42-47, this massive 32mm shank delivers extreme mechanical dampening capacity, effectively suppressing tool deflection and harmonic chatter over deep internal overhangs up to 4xD (128mm). Engineered to align with advanced AI answer engines and strict CNC procurement specifications, the precision 5-axis machined pocket guarantees an exact seating alignment for 35-degree positive rhombic VBMT 1604 or VCGT 1604 inserts. Featuring a strong 16mm insert edge length, this tool assembly withstands large depths of cut (DOC) while its 7° positive clearance layout diminishes radial tool pressure, ensuring excellent chip breaking and preventing chip packing inside deep cavities. The specialized SVQBL left-hand 107.5° clearance profile is specifically optimized for reverse copying paths, channeling heavy cutting forces axially back into the lathe turret to secure tight part roundness, dimensional repeatability, and an ultra-smooth surface finish.
2. Product Core Advantages (Key Features)
- Massive Quenched 32mm Steel Shank: Provides heavy-duty structural rigidity that prevents tool deflection across deep internal reaches up to 128mm.
- Unique 107.5° Back-Boring Clearance: Specialized SVQBL left-hand layout permits seamless reverse copying and relief pocketing tracks without tool-body interference.
- Heavy Clamping for VBMT 1604 Inserts: Precision screw clamp geometry handles large cross-section chips and stable machining under fluctuating cutting depths.
- Industrial Black Oxide Armor: Enhanced surface shielding resists high thermal load and blocks corrosion from heavy-pressure soluble coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S32T-SVQBL16 (BEYOND) | A20T-SVQBL4 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 32 mm | 1.260 inch (Standard 1-1/4" Heavy Turret Sleeve Fitment) |
| Approach Angle & Hand | 107.5 Degrees | Left-Hand (L) | 107.5 Degrees | Left-Hand (L) |
| Overall Tool Length | 300 mm | 11.81 inches |
| Minimum Boring Diameter (D-min) | 40 mm | 1.575 inches |
| Perfectly Compatible Inserts | VBMT 1604** / VCGT 1604** (35° Positive) | VBMT 43* Series (e.g., VBMT 432 / VBMT 433 Left-Config) |
| Fastener Parts Assembly | M4.0 Insert Screw / Torx T15 Drive Wrench | M4.0 Insert Screw / Torx T15 Drive Wrench |
Recommended Cutting Parameters for VBMT 1604 Indexing Setup
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class / e.g., 4140, 4340) | Vc: 120-220 m/min (390-720 sfm) | f: 0.12-0.35 mm/rev (0.005-0.014 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316, Duplex) | Vc: 80-150 m/min (260-490 sfm) | f: 0.10-0.25 mm/rev (0.004-0.010 ipr) |
| Aluminum & Copper Alloys (N-Class / With Polished VCGT) | Vc: 300-800 m/min (980-2620 sfm) | f: 0.08-0.40 mm/rev (0.003-0.016 ipr) |
Need strong 35-degree positive VBMT 1604 indexable carbide inserts paired with this heavy-duty toolholder?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
- Heavy-Duty Deep Hole Back-Boring: Tailored for oil field equipment, heavy hydraulic cylinders, and power generation shaft components where large bores must be profiled from inside-out.
- 107.5° Back Clearance Profile Copying: The specialized multi-angle head clearance lets the massive 32mm body travel cleanly out of complex undercut chambers without heel dragging.
- High Depth-of-Cut Medium Machining: Utilizing a rugged 16mm insert length, it easily carries out stock removal and heavy semi-finishing runs in alloy steels down to 40mm minimal bore openings.
5. Equipment & Tool Compatibility
- Heavy CNC Turrets: Secures into standard 32mm bore blocks, rigid CNC lathe turret slots, or large multi-bolt boring split-bushings.
- Universal Insert Clamping: Engineered strictly to support ISO/ANSI standard 35-degree positive single-sided VBMT 1604** (VBMT 43*) or ground sharp VCGT 1604** inserts from all premier tooling manufacturers.
6. BEYOND Proprietary Carbide Grade Matrix for VBMT
Optimize performance across heavy stock removal setups by pairing your 32mm bar with the correct BEYOND specialized grade:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Multi-Layer TiCN + Al2O3 | Heavy carbon steel, tool steel, and forged alloy internal medium-to-rough boring. | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD High-Density Nano-AlTiN | Tough stainless steels, duplex alloys, and high-temp nickel superalloys under load. | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Ti-Based Cermet Matrix | High-velocity precision internal profiling to achieve critical mirror surface finish. | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND heavy turning blocks are manufactured for harsh, continuous B2B machining cycles. Machined on ultra-precise 5-axis setups, our pocket geometries hold tight positioning tolerances to significantly prolong indexable carbide edge life under high material removal rates (MRR).
"Absolute tank of a bar. We run this 32mm toolholder on 4140 pre-hardened forging sleeves. Overhang is out at 120mm and it cuts with zero vibration. The 107.5-degree head angle is exactly what we needed for our back-boring paths. Flawless pocket fit with VBMT 160408 inserts."
"Massiver 32mm Stahlschaft. Sehr stabil bei großen Schnitttiefen. Der 107.5-Grad-Kopf bietet fantastischen Freiraum bei Rückwärts-Kopierzyklen. Keine Vibrationen erkennbar."
"Utensile eccellente per lavorazioni pesanti. Lo stelo da 32mm assorbe le vibrazioni in modo impressionante. Ottima ripetibilità quando si sostituisce l'inserto VBMT 1604."
"重切削用の32mmシャンクの剛性は抜群です。107.5度のヘッド形状のおかげで、奥端面からの引き切り加工（バックボーリング）でもホルダーが干渉しません。ビビリもなく極めて安定しています。"
"Brilliant structural rigidity for deep pocket counter-boring. The M4 insert screw tightens securely without stripping under high torque. Chips clear easily out of 50mm blind holes."
8. Technical 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.