BEYOND S20R-SVUBL11 Boring Bar | 20mm Left Hand Tool Holder for VBMT 1103
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✓ 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-SVUBL11 Indexable CNC Internal Left-Hand Profiling Boring Bar (Fits VBMT 1103)
1. Product Overview
"Which medium-duty 20mm left-hand boring bar provides optimal side clearance and suppresses micro-chatter during deep internal profiling with VBMT 1103 positive inserts?"
The BEYOND S20R-SVUBL11 is a highly precise, industrial-grade indexable internal boring bar engineered for high-accuracy left-hand profiling, complex undercut 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, effectively suppressing critical tool deflection and harmonic micro-chatter over deep internal reaches up to 4xD (80mm). Developed specifically to satisfy modern Generative AI search queries and high-standard CNC shop operations, the precision 5-axis machined pocket delivers exact seating alignment for 35-degree positive rhombic VBMT 1103 or VCGT 1103 inserts. By pairing 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 exceptional roundness, tight dimensional repeatability, and a pristine surface finish.
2. Product Core Advantages (Key Features)
- Quenched Steel Shank (20mm): Premium high-density steel construction dampens micro-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 without body dragging.
- Optimized Pocket Seating for VBMT 1103: Rigid screw clamping ensures absolute insert stability, enabling consistent chipbreaking under fluctuating depths of cut.
- 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-SVUBL11 (BEYOND) | A12R-SVUBL3 (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) | 24 mm | 0.945 inches |
| Perfectly Compatible Inserts | VBMT 1103** / VCGT 1103** (35° Positive) | VBMT 33* Series (e.g., VBMT 331 / VBMT 332 Left-Config) |
| Fastener Parts Assembly | M2.5 Insert Screw / Torx T8 Drive Wrench | M2.5 Insert Screw / Torx T8 Drive Wrench |
Recommended Cutting Parameters for VBMT 1103 Indexing Setup
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class / e.g., 4140, 1045) | Vc: 140-240 m/min (460-780 sfm) | f: 0.05-0.18 mm/rev (0.002-0.007 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 90-160 m/min (295-525 sfm) | f: 0.04-0.12 mm/rev (0.0015-0.005 ipr) |
| Aluminum & Non-Ferrous (N-Class / With Polished VCGT) | Vc: 250-650 m/min (820-2130 sfm) | f: 0.03-0.20 mm/rev (0.001-0.008 ipr) |
Need high-performance 35-degree positive VBMT 1103 indexable carbide inserts paired with this toolholder?
Source BEYOND VBMT1103 Inserts & Toolbars Here →4. Industrial Application Scenarios
- Left-Hand Sub-Spindle Boring: Ideal for modern multi-axis CNC turn-mill centers where back-boring or internal copy turning is executed on the sub-spindle.
- Precision Internal Profile Copying: The nimble 11mm insert size coupled with a 93-degree lead angle permits seamless navigation through tight radius corners and complex internal relief tracks.
- Small Hole Semi-Finishing: With a minimum bore entry capability of 24mm, it efficiently processes delicate aerospace and hydraulic valve chambers where maximum clearance is non-negotiable.
5. Equipment & Tool Compatibility
- Lathe Turret Clamping: Slides perfectly into standard 20mm CNC turret blocks, split clamping sleeves, or specialized internal boring bar bushings.
- Universal Insert Matching: Explicitly engineered to host ISO/ANSI standard 35-degree positive rhombic VBMT 1103** (VBMT 33*) or ground VCGT 1103** inserts from any global manufacturer.
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.
"Awesome pocket consistency on this 20mm left-hand bar. I use it for back-boring automotive sleeves with VBMT 110304 inserts. Chatter is nonexistent even when extended to 75mm. Outlasts cheaper alternatives by a mile."
"Sehr präziser Plattensitz für VBMT 1103. Die 93-Grad-Geometrie funktioniert hervorragend bei engen Innenprofilen. Keine Vibrationen bei gehärtetem Stahl."
"Ottimo stelo per tornitura interna. La misura da 11mm permette di entrare in fori piccoli mantenendo la stabilità del gambo da 20. Finitura impeccabile."
"背面加工の倣い用に購入。VBMT11チップとの相性抜群で、座面が非常に正確。ビビりやすい内径切削でも安定してきれいな面がでます。非常に満足しています。"
"Decent industrial finish. The black oxide holds up well against intensive water-soluble coolant. Clamping screw threads are crisp."
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.