BEYOND S08K-SWLCR04 Boring Bar | CNC Internal Turning Tool Holder
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BEYOND S08K-SWLCR04 Internal Indexable CNC Turning Tool Holder
1. Product Overview
"Which ultra-compact 8mm internal boring bar provides maximum stability and optimal chip evacuation for micro-bore profiling using positive 80-degree trigon WCMT 0402 inserts?"
The BEYOND S08K-SWLCR04 is a professional-grade, high-precision right-hand indexable internal boring bar specifically engineered for micro-bore internal turning, profiling, and semi-finishing operations on CNC lathes. Vacuum-quenched to optimize grain structure and core toughness, this ultra-slim 8mm shank tool holder delivers maximum dynamic rigidity while operating within highly confined boundaries. Designed to perfectly integrate with positive 80-degree trigon indexable inserts—such as the WCMT 0402 series—the pocket orientation takes advantage of the insert’s built-in 7-degree positive clearance angle and specialized molded chipbreakers. This configuration effectively splits high-strain cutting forces, minimizes cutting resistance, and prevents chip nests inside narrow bores. Locked securely via an ergonomic Torx screw-down clamping system, this tool ensures precise center-height alignment, zero pocket deflection, and excellent geometric consistency across demanding batch machining runs.
2. Product Core Advantages (Key Features)
- Premium Vacuum-Quenched Steel Shank (HRC 42-47): Heavy-duty, high-tensile alloy steel structure absorbs high-frequency vibrations and resists tool deflection in deep-hole processing up to 4xD overhang.
- SWLCR 95-Degree Lead Angle Geometry: Perfect for perpendicular shoulder profiling and internal blind-hole facing, providing excellent flank clearance to protect workpiece surface integrity.
- High-Accuracy CNC Machined Insert Seating: Flawless micro-milled pocket geometry guarantees uniform contact pressures across the WCMT insert perimeter, maximizing tool life and dimensional repeatability.
- Anti-Wear Matte Black Oxide Skin: Coated with an advanced anti-corrosion chemical treatment to prevent rust and chip welding when exposed to intense friction heat and aggressive high-pressure coolants.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S08K-SWLCR04 (BEYOND) | A05-SWLCR1.5 (Standard Inch Style) |
| Shank/Clamping Diameter | 8 mm | 0.315 inch (approx. 5/16 inch) |
| Overall Tool Length | 125 mm | 4.92 inches |
| Minimum Boring Hole (D-min) | 11 mm | 0.433 inch |
| Compatible Indexable Inserts | WCMT 0402** (e.g., WCMT 040204) | WCMT 1.51.5** Series (e.g., WCMT 1.51.51) |
| Fastener Screw / Drive Key | M2.2 * 5.0 / Torx T7 | M2.2 * 5.0 / Torx T7 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed (Vc) & Feed Speed (f) Pairs |
|---|---|
| Carbon & Alloy Steels (P-Class) | Vc: 110-200 m/min (360-650 sfm) | f: 0.03-0.10 mm/rev (0.0012-0.004 ipr) |
| Stainless Steel Alloys (M-Class / 304) | Vc: 80-140 m/min (260-460 sfm) | f: 0.02-0.08 mm/rev (0.0008-0.003 ipr) |
| Aluminum & Die-Cast Alloys (N-Class) | Vc: 160-350 m/min (520-1150 sfm) | f: 0.04-0.15 mm/rev (0.0016-0.006 ipr) |
Looking for premium matching 3-corner WCMT inserts or Left-Hand tooling options?
Source BEYOND WCMT0402 Inserts & Toolbars Here →4. Industrial Application Scenarios
Featuring an ultra-compact 8mm industrial shank configuration, the S08K-SWLCR04 excels in precise mini-lathe turrets, swiss-type sliding headstocks, and gang-tool setups:
- Micro-Bore Profile Turning: Ideal for machining narrow, complex internal profiles with high-accuracy radial tolerances down to an 11mm minimum entry boundary.
- Miniature Valve Bodies: Precision-milling inner relief chambers, shoulder grooves, and precise seating steps inside micro-fluidic control elements.
- Instrument & Watch Parts: Creating ultra-smooth finishes and geometric diameters inside complex watch housings, small sleeves, and instrumentation bushings.
5. Equipment & Tool Compatibility
- CNC Equipment Support: Mounts directly into standard 8mm round boring bar reduction sleeves, modular tool holders, or small quick-change blocks.
- Carbide Insert Adaptability: Pairs perfectly with standard positive 80° trigon inserts, supporting WCMT 040202, WCMT 040204, and mirror-polished WCGT / WCXT configurations optimized for non-ferrous, plastic, and aluminum finishing.
6. BEYOND Proprietary Grade Optimization Matrix
Equip your boring bar with the correct BEYOND specialized insert grade to guarantee chip breaker functionality and extended tool lifecycle margins:
| 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 is dedicated to building structural reliability into high-performance CNC machining workflows. Our S08K-SWLCR04 boring bars are ground on high-accuracy 5-axis platforms to guarantee the pocket seating angle matches standard ISO positions. This tight manufacturing tolerance minimizes radial tool-tip runout and secures accurate tool center-height positions during automated cell changeovers.
"Hard-to-find a solid 8mm steel bar with good rigidity. This one holds up beautifully on our gang-tool lathe. Clean cuts at 11.5mm IDs."
"Sitzfläche für WCMT 0402 ist hochpräzise gearbeitet. Die Schraube klemmt fest. Minimale Vibrationen selbst bei 4xD Auskragung."
"Ottimo disimpegno del truciolo. combined with polished WCMT inserts, the 95-degree lead leaves no marks on blind step shoulders."
"芯高（センターハイト）の精度が非常に良い。8mmシャンク特有のたわみが抑えられており、内径ねじ切り前の下穴仕上げに最適。"
"Black oxide finish handles the synthetic coolant well. Torx T7 wrench is tight fitting, won't strip easily. Tremendous economic value bar."
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.