BEYOND S20R-SVQCL16 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SVQCL16 Indexable CNC Internal Turning Boring Bar
1. Product Overview
"Which 20mm left-hand boring bar allows mounting large, heavy-duty VCMT 1604 or VCGT 1604 inserts to handle aggressive internal profiling and back-boring without tool deflection?"
The BEYOND S20R-SVQCL16 is a uniquely engineered, high-performance left-hand indexable internal boring bar designed to bridge the gap between medium-diameter bore clearance and heavy-duty material removal. Manufactured from premium solid alloy steel that undergoes a specialized multi-stage vacuum quenching process to achieve a core toughness of HRC 42-47, this 20mm diameter shank provides exceptional torsional rigidity and dampens structural harmonics over extended cycles. Unlike standard bars, its precision-machined head architecture is optimized to support larger 35-degree rhombic indexable inserts featuring a 7-degree positive relief angle. It serves as an ultra-stable platform for standard VCMT 1604 carbide inserts (integrated with robust M-class or semi-finishing chipbreakers for excellent chip curling in carbon steels) and VCGT 1604 ground inserts (featuring mirror-polished high-rake chipbreaker geometries that slice cleanly through sticky non-ferrous aluminum alloys). Utilizing a 107.5-degree approach angle configuration (SVQCL framework), it offers superior trailing edge clearance during reverse profiling and deep internal undercut turning, ensuring chips are evacuated backwards out of a minimum 25mm bore diameter without bird-nesting or scoring the finished surface.
2. Product Core Advantages (Key Features)
- 20mm Hardened Alloy Body with Heavy-Insert Capacity: Allows a medium-sized 20mm bar to deploy large 16mm edge-length inserts for high depth-of-cut loops.
- 107.5° SVQCL Clearance Mechanics: Engineered for left-hand internal copying, ensuring the tool heel never rubs against steep internal walls during profile tracking.
- Rigid Screw-Lock Fastener System: Clamps the large 1604 insert tightly via a high-tensile M4 screw, eliminating radial micro-deflection under heavy cutting forces.
- Industrial Black Oxide Matrix Finish: Reduces friction coefficient along the chip interface, preventing built-up edge (BUE) and extending holder life.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SVQCL16 (BEYOND) | A12R-SVQCL5 (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 3.3* / VCGT 3.3* Series (e.g., 3.31 or 3.32) |
| Fastener Screw / Drive Key | M4.0 * 9.0 / Torx T15 | M4.0 * 9.0 / 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: 130-230 m/min (425-750 sfm) | f: 0.08-0.25 mm/rev (0.003-0.010 ipr) |
| Stainless Steel Alloys (M-Class / 304, 316) | Vc: 85-150 m/min (280-490 sfm) | f: 0.06-0.18 mm/rev (0.0024-0.007 ipr) |
| Aluminum & Non-Ferrous Alloys (N-Class) | Vc: 280-700 m/min (920-2300 sfm) | f: 0.08-0.30 mm/rev (0.003-0.012 ipr) |
Looking for premium matching 35-degree VCMT/VCGT 1604 inserts or alternative boring sizes?
Source BEYOND VCMT1604 Inserts & Toolbars Here →4. Industrial Application Scenarios
Engineered with a stable 20mm alloy body combined with the heavy clamping matrix of a 16mm insert pocket, the S20R-SVQCL16 thrives in specialized manufacturing environments:
- Medium Bore Deep Copying: Excels at generating complex internal geometries inside multi-stepped hydraulic adapters and valve houses starting from a 25mm entry hole.
- High Depth-of-Cut Profiling: Allows workshop operators to run larger depth-of-cut roughing cycles inside medium bores, saving cycle times compared to slim finishes.
- Complex Valve Back-Boring: Offers the unique left-hand path clearance needed to hook back internal shoulders cleanly on automated CNC lathes.
5. Equipment & Tool Compatibility
- CNC Turret Mounting: Fits standard 20mm tooling blocks, turret boring bar holders, or industry split sleeves effortlessly.
- Insert Compatibility Range: Standardized for all standard ISO/ANSI 35-degree positive rhombic VCMT 1604** or VCGT 1604** inserts. Seamlessly runs nose radii configurations from 0.4mm (160404) up to 0.8mm (160408) depending on structural chipbreaking requirements.
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.
"Hard to find a solid 20mm bar that takes large 16mm inserts without structural chatter. This S20R-SVQCL16 handles our back-profiling loops perfectly. Holds excellent size over long shifts."
"Der Plattensitz ist absolut makellos gefräst. Trotz der Kombination aus 20mm Schaft und großer 16er Wendeplatte ist die Stabilität hervorragend. Sehr zufrieden mit BEYOND."
"Ottimo barenatore sinistro. Lo usiamo per tornitura di profili interni su raccordi in acciaio inox. Ottima la vite M4 che tiene fermo l'inserto senza movimenti."
"20mm径シャンクでありながら16mmの大きなチップ(VCMT1604)を装着できるため、中内径の荒加工で大活躍しています。107.5度の逃げ角により内壁への干渉が一切ありません。"
"Great clearance on stepped internal contours. Chips flow out smoothly back from the hole without tangling up."
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.