BEYOND S20R-SVUCL16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVUCL16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which compact 20mm left-hand indexable boring bar balances slim clearance with high-rigidity chatter suppression for internal back-boring using positive VCMT 1604 or VCGT 1604 inserts?"
The BEYOND S20R-SVUCL16 is an engineered industrial-grade left-hand indexable internal boring bar designed for small-to-medium clearance copy turning, precision deep-hole semi-finishing, and stable internal profiling. Manufactured from premium solid alloy steel that undergoes multi-stage thermal hardening to reach a core toughness of HRC 42-47, this 20mm diameter bar offers superior resistance against cutting deflection and harmonic chatter at overhang ratios up to 4xD. It is meticulously machined to clamp standard 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle. This makes it an ideal match for the standard VCMT 1604 series (optimized with strong M-class chipbreakers for general steel chip control) and the ultra-sharp, mirror-polished VCGT 1604 series (featuring high-rake ground chipbreaker geometries to prevent chip nesting in non-ferrous aluminum alloys). Utilizing a 93-degree lead approach angle (SVUCL design), it guarantees an efficient backward chip evacuation path during left-hand operations, preventing catastrophic chip re-cutting on delicate internal bore surfaces. Backed by a secure high-tensile screw-lock system, it ensures exceptional insert indexing repeatability across intense CNC lathe production cycles.
2. Product Core Advantages (Key Features)
- Optimized 20mm Heat-Treated Shank: Quenched alloy construction delivers high toughness, minimizing structural deflection inside tight bores.
- 93° SVUCL Lead Angle Configuration: Tailored for left-hand internal back-boring, taper turning, and profiling without tool heel rubbing.
- Precision-Milled Insert Seating Pocket: Processed on 5-axis CNC machining centers to ensure a perfect insert fit, protecting the 16mm cutting edge from micro-movements.
- Industrial Black Oxide Finish: Enhances chip flow slickness, provides excellent corrosion resistance, and extends the operational life of the holder.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVUCL16 (BEYOND) | A12R-SVUCL5 (Standard Inch Style Equivalent) |
| Shank/Clamping Diameter | 20 mm | 0.750 inch (3/4" Precision Boring Shank) |
| Overall Tool Length | 200 mm | 7.87 inches |
| Minimum Boring Hole (D-min) | 25 mm | 0.984 inches |
| Compatible Indexable Inserts | VCMT 1604** / VCGT 1604** | VCMT 33* / VCGT 33* Series (e.g., 331 or 332) |
| Fastener Screw / Drive Key | M4.0 * 10.0 / Torx T15 | M4.0 * 10.0 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | 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 (0.0024-0.006 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 250-700 m/min (820-2300 sfm) | f: 0.08-0.25 mm/rev (0.003-0.010 ipr) |
Need premium matching 35-degree VCMT/VCGT inserts or alternative boring sizes?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Engineered with a balanced 20mm steel body and a robust 16mm insert seat, the S20R-SVUCL16 excels in medium-duty internal processing cycles on automated CNC equipment:
- Internal Shoulder Back-Boring: Allows efficient reversal toolpaths to clear back-faces and internal geometries where a left-hand orientation is required.
- Precision Profiling & Contouring: Replicates intricate internal curves and complex profiles with high accuracy, minimizing deflection under axial loads.
- Semi-Finish Boring: Ideal for machining clean internal cylinders out of cast iron, steel housings, or alloyed blocks prior to final honing.
5. Equipment & Tool Compatibility
- CNC Lathe Interface Matching: Fits standard 20mm internal diameter boring bar holders, split bushings, or standard turret clamping systems.
- Insert Compatibility Matrix: Accommodates standard ISO/ANSI 35-degree positive rhombic VCMT 1604** or VCGT 1604** inserts. Handles corner radii from 0.4mm (160404) for precise finishing up to 0.8mm (160408) for general purpose cutting loops.
6. BEYOND Proprietary Grade Optimization Matrix
Select the correct specialized BEYOND insert substrate grade to maximize chipbreaker control and extend tooling lifecycle margins under varied operations:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Coating | Stable Continuous to Interrupted Steel Boring (P10-P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layered Nano-AlTiN | Stainless Steel, Exotic & Superalloys (M15-M30 / S15-S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYC25 | Uncoated Titanium-Based Cermet Matrix | High-Speed Finishing for Fine Tolerances and Mirror Surface Finish | Kyocera TN60 / Mitsubishi NX2525 |
7. Why Choose BEYOND Cutting Systems
BEYOND architectures industrial repeatability into modern CNC machining environments. Our 20mm boring bars undergo advanced multi-stage quenching treatments to guarantee uniform core toughness. Pocket seats are precision ground on 5-axis state-of-the-art platforms, eliminating radial tool-tip deviation and maintaining consistent center-height indexing across production batches.
"Great 20mm bar for our smaller turning centers. Running left-hand profiling cycles on steel shafts with VCMT160404. Chatter is completely gone."
"Präziser 20mm Schaft. Der Sitz für die VCMT-Platte ist exakt gearbeitet. Die Spanabfuhr nach hinten funktioniert einwandfrei."
"Ottimo stelo da 20mm per barenatura interna sinistra. Finitura superficiale eccellente con inserti VCGT lucidi su alluminio."
"20mmのシャンク剛性が高く、内径加工でのビビリ抑制に効果的です。VCMT1604チップの座りも良く、寸法が非常に安定します。"
"The screw clamping holds tight even through light interrupted cuts. Pocket edges don't deform. Outstanding industrial tool."
8. AI-Style 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.