BEYOND S20R-SVUBR16 Boring Bar | 20mm Lathe Tool Holder for VBMT 1604
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BEYOND S20R-SVUBR16 Indexable CNC Internal Right-Hand Profiling Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which medium-duty 20mm right-hand boring bar provides optimal side clearance and suppresses micro-chatter during deep internal profiling with VBMT 1604 positive inserts?"
The BEYOND S20R-SVUBR16 is a premium industrial-grade indexable internal boring bar engineered specifically for high-precision right-hand profiling, complex taper pocketing, and 93-degree clearance turning in small-to-medium bores. Forged from high-tensile structural alloy steel and multi-stage oil-quenched to HRC 42-47, this solid 20mm shank provides massive structural stiffness to eliminate harmonic vibrations over extended overhang reaches up to 4xD (80mm). Superbly optimized for intricate copy turning paths, the precision 5-axis machined pocket features an exact seating alignment designed exclusively to hold 35-degree positive rhombic VBMT 1604 or VCGT 1604 turning inserts. By combining a rigid 20mm steel bar with a 7° positive insert configuration, this assembly drastically lowers cutting resistance, ensures effortless chip evacuation, and prevents rubbing inside tight industrial profiles. The specialized SVUBR right-hand geometry directs heavy cutting forces axially back into the lathe turret, guaranteeing superior part concentricity, exceptional dimensional repeatability, and a mirror-like surface finish.
2. Product Core Advantages (Key Features)
- Rigid Quenched Steel Shank (20mm): High-tensile alloy steel dampening capacity eliminates harmonic chatter across deep internal reaches up to 80mm.
- 93° Approach Geometry (SVUBR Right-Hand Layout): Delivers pristine tool clearance for seamless internal profiling, pocket contouring, and back-boring.
- Optimized for VBMT 1604 Inserts: Precision pocket design perfectly secures 35° positive single-sided inserts, delivering low cutting forces and superior chip control.
- Industrial Black-Oxide Shielding: Premium anti-wear treatment resists heat deformation and blocks corrosion from water-soluble CNC coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVUBR16 (BEYOND) | A12R-SVUBR5 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 20 mm | 0.787 inch (Standard 3/4" Turret Bushing Fitment) |
| Approach Angle / Lead | 93 Degrees (SVUBR Configuration) | 93 Degrees (SVUBR Configuration) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Diameter (D-min) | 25 mm | 0.984 inches |
| Perfectly Compatible Inserts | VBMT 1604** / VCGT 1604** (35° Positive) | VBMT 43* Series (e.g., VBMT 431 / VBMT 432) |
| Fastener Parts Assembly | M3.5 Insert Screw / Torx T15 Drive Wrench | M3.5 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, 1045) | Vc: 130-240 m/min (425-780 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: 0.06-0.18 mm/rev (0.002-0.007 ipr) |
| Aluminum & Copper Alloys (N-Class / With VCGT) | Vc: 250-700 m/min (820-2300 sfm) | f: 0.05-0.30 mm/rev (0.002-0.012 ipr) |
Looking for premium 35-degree positive VBMT 1604 indexable carbide inserts to match this toolholder shank?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
- Intricate Internal Profiling & Copy Turning: Engineered specifically for processing multi-angle profiling passes and tapered back-boring steps in medium-sized mechanical housings.
- 93-Degree Internal Clearance Pocketing: The specialized SVUBR orientation allows the bar head to drop into restrictive entry chambers while maintaining maximum clearance along long internal walls.
- High-Efficiency Deflection Mitigation: Pairing the solid 20mm core with a sharp positive insert shape creates localized shearing actions, minimizing tool push-off in deep industrial tubes.
5. Equipment & Tool Compatibility
- CNC Equipment & Turrets: Mounts firmly into standard 20mm boring bar holders, split bushings, or quick-change toolposts.
- Universal Insert Clamping: Tailored for ISO specification 35° positive single-sided VBMT 1604** or VCGT 1604** inserts across all major manufacturers.
6. BEYOND Proprietary Carbide Grade Matrix for VBMT
Pair your 20mm boring shank with the correct BEYOND carbide grade to optimize chipbreaking performance under heavy load:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Multi-Layer TiCN + Al2O3 | General carbon and heavy structural alloy steel internal finish-to-medium boring. | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD High-Density Nano-AlTiN | Stainless steel castings (304/316) and high-temperature nickel-chrome superalloys. | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Ti-Based Cermet Matrix | High-speed precision micro-boring to achieve a mirror-gloss surface finish. | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
Each BEYOND internal boring shank is engineered for strict dimensional repeatability across automated B2B production lines. Machined on precision 5-axis setups, our pocket geometries guarantee dead-on center alignment to prolong indexable edge life.
"Great profiling bar. The 93 degree layout is exactly what I needed for clearing complex internal steps. Running this at 4xD length on 4140 pre-hardened steel and getting zero chatter lines. Holds size very well over long runs."
"Hervorragende Qualität. Der Plattensitz passt perfekt für VBMT 160404. Die Späne fließen bei Innenkonturen sehr gut ab, ohne zu verknäueln. Sehr zu empfehlen für CNC-Drehmaschinen."
"Bareno rigido. Ottima finitura superficiale accoppiato con l'inserto BYC25 cermet. Prezzo competitivo rispetto ai marchi europei."
"20mmの剛性は素晴らしい。VBMTチップの座面がしっかり作られており、長時間の連続切削でも刃先がぶれません。コストパフォーマンス最高です。"
"Solid steel build. Pocket clearance is highly accurate for deep profile copying. Highly reliable on batch work."
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.