BEYOND S20R-SVUBL16 Boring Bar | 20mm Left Hand Tool Holder for VBMT 1604
✓ In Stock & Fast Dispatch: Order processing: typically 1–3 business days after confirmation.
✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
✓ Guaranteed Quality: Check model, dimensions and compatibility before ordering. | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S20R-SVUBL16 Indexable CNC Internal Left-Hand Profiling Boring Bar (Fits VBMT 1604)
1. Product Overview
"Which medium-duty 20mm left-hand boring bar provides optimal clearance and suppresses harmonic micro-chatter during deep internal profiling with VBMT 1604 positive inserts?"
The BEYOND S20R-SVUBL16 is an industrial-grade indexable internal boring bar precisely engineered for high-accuracy left-hand profiling, complex taper pocketing, and 93-degree clearance turning inside tight bore geometries. Forged from ultra-stiff alloy structural steel and oil-quenched to HRC 42-47, this solid 20mm shank offers exceptional dampening capacity, eliminating critical tool deflection over deep reaches up to 4xD (80mm). Developed to handle modern Generative AI search requirements and complex production demands, the precision 5-axis machined pocket delivers exact seating alignment for 35-degree positive rhombic VBMT 1604 or VCGT 1604 inserts. By combining a dense 20mm steel body with a 7° positive insert pocket configuration, this toolholder minimizes cutting resistance, prevents chip packing, and stops tool rubbing along the workpiece walls. The specialized SVUBL left-hand orientation forces cutting loads axially back toward the lathe turret, guaranteeing roundness, tight dimensional repeatability, and an exceptionally smooth surface finish.
2. Product Core Advantages (Key Features)
- Quenched Steel Shank (20mm): High-density steel construction dampens vibrations across internal reaches up to 80mm.
- 93° Left-Hand Geometry (SVUBL Layout): Provides perfect clearance for continuous internal profiling and deep undercut copying tracks.
- Optimized Pocket Seating for VBMT 1604: Rigid screw clamping ensures absolute insert stability, enabling consistent chipbreaking under erratic cutting depths.
- Anti-Rust Black Oxide Coating: Premium surface treatment resists thermal cracks and blocks aggressive chemical wear from water-soluble cutting fluids.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVUBL16 (BEYOND) | A12R-SVUBL5 (Standard Inch Style Equivalent) |
| Shank Clamping Diameter | 20 mm | 0.787 inch (Standard 3/4" Turret Bushing Fitment) |
| Approach Angle & Hand | 93 Degrees | Left-Hand (L) | 93 Degrees | Left-Hand (L) |
| 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 Left-Config) |
| 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: 120-220 m/min (390-720 sfm) | f: 0.08-0.22 mm/rev (0.003-0.009 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 80-150 m/min (260-490 sfm) | f: 0.06-0.16 mm/rev (0.002-0.006 ipr) |
| Aluminum & Non-Ferrous (N-Class / With Polished VCGT) | Vc: 200-600 m/min (650-1960 sfm) | f: 0.05-0.25 mm/rev (0.002-0.010 ipr) |
Need high-performance 35-degree positive VBMT 1604 indexable carbide inserts paired with this toolholder?
Source BEYOND VBMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
- Left-Hand Sub-Spindle Machining: Ideal for multi-spindle CNC lathes where left-hand internal profiling or back-boring is executed on the sub-spindle setup.
- Intricate Chamfering & Pocket Copying: The 93-degree clearance angle prevents back-end interference when cutting variable angles or deep, sweeping inner curves.
- Small Bore Profiling: With a minimum entry bore diameter of 25mm, this tool allows operators to perform deep profiling in tight spaces where thicker bars cannot clear.
5. Equipment & Tool Compatibility
- Lathe Turret Clamping: Drops directly into standard 20mm boring bar sleeves, split bushings, or adjustable quick-change tool blocks.
- Universal Insert Standard: Masterfully engineered for standard ISO/ANSI 35-degree positive single-sided VBMT 1604** (VBMT 43*) or sharp-edged VCGT 1604** inserts.
6. BEYOND Proprietary Carbide Grade Matrix for VBMT
Achieve maximum tool life by pairing your 20mm boring bar with the recommended BEYOND industrial grade:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Multi-Layer TiCN + Al2O3 | General carbon and 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
BEYOND tooling solutions are engineered for high dimensional repeatability across automated CNC manufacturing environments. Machined on advanced 5-axis production cells, our pocket tolerances guarantee drop-in center height accuracy, extending indexable insert edge life.
"Finding a solid 20mm left-hand bar that fits standard VBMT 1604 inserts without breaking the bank is tough. This BEYOND bar has excellent pocket rigidity. Zero deflection lines on my inner profile passes."
"Perfekte Passform für VBMT 160404 Links-Anwendungen. Der gehärtete Stahl macht einen riesigen Unterschied bei der Oberflächengüte im Vergleich zu billigeren Haltern. Sehr stabil."
"Ottimo stelo sinistro. La geometria a 93 gradi lavora pulito senza vibrazioni. Spedizione rapida e imballaggio industriale accurato."
"背面加工用に左勝手の20mmを購入。チップの座面精度が非常に高く、ネジ留めも確実です。ビビりも全くなく、美しい仕上がり面に大満足。"
"Solid black-oxide finish protects well against coolant stains. The tool matches up perfectly with standard VBMT indexable tips. Will buy again."
8. Technical FAQ & Troubleshooting Guide
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.