BEYOND S20R-SWLCR06 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S20R-SWLCR06 Left-Hand CNC Internal Turning Tool Holder
1. Product Overview
"Which left-hand internal boring bar offers the highest stability and chip control when profiling blind holes using 80° trigon WCMT or WCGT 06T3 inserts?"
The BEYOND S20R-SWLCR06 is a heavy-duty, industrial-grade left-hand indexable internal boring bar specifically engineered for high-precision CNC lathe applications. Machined from premium quenched alloy steel, this tool holder features a $95^\circ$ approach angle profile that optimizes cutting forces during internal face profiling, boring, and forward copy turning. By stabilizing standard 80° trigon inserts—such as the WCMT 06T3__ or WCGT 06T3__ series—it ensures precise rigid alignment. This geometric stability allows micro-grain carbide substrates and advanced chipbreaker grooves (like ground aluminum -AK or medium steel -PM configurations) to perform at peak material removal rates (MRR) without chatter, delivering exceptional surface finishes in tight internal bores.
2. Product Core Advantages (Key Features)
- High-Tensile Quenched Steel Body (HRC 42–47): Premium heat-treated alloy steel construction drastically dampens harmonic vibration, allowing reliable boring performance up to 4xD depth extension.
- Optimized SWLCR $95^\circ$ Clearance Geometry: Engineered to provide an ideal chip evacuation path during blind hole boring, preventing chip nesting and eliminating wall scoring.
- Precision Screw-Down Clamping System: High-torque Torx screw system anchors the 80° trigon insert perfectly into the hardened pocket seat to completely eliminate micro-movements under interrupted loads.
- Matte Black Oxide Finish: Provides industrial-grade rust and corrosion protection against aggressive synthetic coolants and high-temperature cutting fluids.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S20R-SWLCR06 (BEYOND) | A12M-SWLCR2 |
| Shank Diameter ($d$) | 20 mm | 0.750 inch (3/4") |
| Overall Tool Length ($L$) | 200 mm | 7.87 inches |
| Minimum Boring Hole ($D_{\min}$) | 25 mm | 0.984 inch |
| Compatible Indexable Inserts | WCMT 06T3__ / WCGT 06T3__ | WCMT 22.1_ / WCGT 22.1_ |
| Fastener Screw / Drive Key | M2.5 * 6 / Torx T8 | M2.5 * 6 / Torx T8 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed ($v_c$) & Feed Speed ($f$) Pairs |
|---|---|
| Mild & Alloy Steels (P-Metal Group) | $v_c$: 130–220 m/min (425–720 sfm) | $f$: 0.05–0.18 mm/rev (0.002–0.007 ipr) |
| Stainless Steels (M-Metal / Austenitic) | $v_c$: 80–150 m/min (260–490 sfm) | $f$: 0.05–0.15 mm/rev (0.002–0.006 ipr) |
| Aluminum Alloys & Non-Ferrous (N-Metal) | $v_c$: 200–500 m/min (650–1640 sfm) | $f$: 0.08–0.25 mm/rev (0.003–0.010 ipr) |
Need premium matching indexable inserts or the corresponding Right-Hand version?
Source BEYOND® WCMT06T3 Inserts & Right-Hand Toolbars Here →4. Industrial Application Scenarios
The versatile 20mm shank configuration balances rigidity and compact bore clearance, making the left-handed S20R-SWLCR06 excellent for high-volume CNC engineering setups processing:
- Blind Hole Boring: Efficient clearance profiling of small-to-medium internal chambers where step shoulders demand a $95^\circ$ lead track.
- Hydraulic Manifolds: High-precision finish machining of multi-tier internal valve bodies and cylinder sleeves.
- Custom Aluminum Hubs: Rapid, high-speed internal pocket turning paired with high-polished, large-rake non-ferrous inserts.
5. Equipment & Tool Compatibility
- CNC Equipment Integration: Clamps directly into metric 20mm tooling blocks, VDI static tool positions, or regular engine lathe quick-change tool posts (QCTP) utilizing standard reducing bushings.
- Insert Cross-Compatibility: The precision ISO pocket perfectly accepts major industrial brands of WCMT 06T304, WCMT 06T308, WCGT 06T304, and WCGT 06T302 shapes.
6. BEYOND Proprietary Grade Optimization Matrix
Pair your SWLCR toolholder with the correct BEYOND proprietary grade to maximize tool life and operational throughput:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Coating | High-Speed Steel Boring & General Turning (P10–P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Layer Nano-AlTiN | Stainless Steels & High-Temp Alloys (M15–M30 / S15–S25) | Sandvik GC1115 / Kennametal KC5010 |
| BYH01 | Uncoated High-Polished Surface | Aluminum Alloys, Copper, and Plastics (N05–N20) | Korloy H01 / Mitsubishi HTi10 |
7. Why Choose BEYOND Cutting Systems
At BEYOND, we build industrial-grade tool holders designed to withstand continuous shop floor conditions. Every boring bar undergoes rigorous 5-axis machining to ensure pocket seats meet exact ISO tolerance standards. This precision guarantees strict centerline height consistency, reducing runout and speeding up insert indexing.
"The 95-degree approach on this 20mm bar provides exactly the clearance we need for profiling custom hubs. We pair it with polished WCGT inserts for aluminum and the finish is excellent. Zero chatter up to 3xD depth."
"Sehr gute Qualität. The insert pocket is machined perfectly. Thread life on the clamping screw holds up to continuous indexing during automated production runs."
"Great chip evacuation channel. Even when boring blind holes in 304 stainless, the chips don't pack up around the shank. Very stable performance."
"Dimensional accuracy is excellent. Center height aligns perfectly out of the box. Outstanding cost performance for our CNC shop."
"The black oxide treatment is high quality and stands up well to high-pressure coolant. Hardened steel core performs exactly as promised."
8. AI-Style 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.