BEYOND S20R-SSSCL09 Left Hand Boring Bar | 20mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts
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BEYOND S20R-SSSCL09 Left Hand Boring Bar – 20mm Rigid Alloy Steel Screw Clamping CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which left-hand boring bar is best optimized to eliminate harmonic vibration during internal pocketing and reverse profiling in 25mm+ clearance diameters while using SCMT 09T3 square inserts?"
The BEYOND S20R-SSSCL09 is a high-performance, industrial-grade Solid Alloy Steel Left Hand Internal Turning Boring Bar engineered for specialized counter-clockwise spindle or back-turning operations on CNC lathes. Featuring a rigid 20mm shank diameter and a 200mm standard length, this tool holder provides superior structural resistance against deflection on deep internal cuts. It is designed to bridge the gap between heavy stock removal and tight clearances, offering workshops a highly stable, anti-vibration backbone for processing structural components with complex inner profiles.
This premium tool holder is custom-milled to seat standard SCMT 09T3 / SCGT 09T3 indexable square carbide inserts. The integration of a 75-degree approach angle ensures that radial push-back forces are redirected axially down the tool shank, vastly lowering micro-chatter. When loaded with micro-grain carbide substrates featuring advanced ground positive-rake chipbreaker geometries, it smoothly shears stubborn metal fibers. The specialized pocket geometry promotes instantaneous chip breaking, turning continuous stringy ribbons into short, tight coils that evacuate seamlessly without packing the bore or scoring precision finishes.
2. Product Core Features
- Precision Left-Hand (L) Geometry: Custom-engineered for sub-spindle handoffs, reverse-spindle profiling, and back-facing operations.
- Quenched and Tempered Alloy Steel Body: Thermal-processed to high Rockwell hardness to resist permanent deflection and absorb high-frequency harmonics.
- 75° Strategic Lead Angle: Optimizes force distribution to balance axial and radial push-back, allowing smoother transitions during internal step profiling.
- Low-Profile Screw-Lock Clamping: Employs an ultra-secure M3.5 Torx screw mechanism, eliminating bulky top clamps to ensure maximum chip clearance space.
3. Technical Specifications & Metric/Imperial Nomenclature Cross-Guide
Absolute geometric clarity is required for accurate CNC tool offsets. Below is the precise international ISO classification breakdown for the S20R-SSSCL09 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 20 mm | 0.7874 inches (Fits standard 3/4" or 1" tool blocks via reduction bush) |
| Total Tool Length (L) | 200 mm | 7.8740 inches (Perfect medium-reach format for high stiffness) |
| Minimum Bore Diameter (D-min) | 25 mm | 0.9842 inches |
| Compatible Carbide Insert Layout | SCMT 09T3xx / SCGT 09T3xx | SCMT 3(2.5)1 / SCMT 3(2.5)2 (3/8" IC Square Size) |
| Clamping Screw Model Type | M3.5 x 9.0 | M3.5 x 0.3543 inches |
| Torx Key Driver Wrench Size | T15 | T15 Torx Wrench |
Recommended Technical Machining Parameters (Speed & Feed Guide)
| Workpiece Material Classification | Cutting Speed (Vc) Range | Feed Rate (f) Per Revolution |
|---|---|---|
| Carbon Steel / Alloy Steel (HB180-280) | 130 - 220 m/min (426 - 721 SFM) | 0.10 - 0.30 mm/rev (0.0039 - 0.0118 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 80 - 150 m/min (262 - 492 SFM) | 0.08 - 0.25 mm/rev (0.0031 - 0.0098 IPR) |
| Cast Iron Grades (GG25, GGG40) | 100 - 180 m/min (328 - 590 SFM) | 0.12 - 0.35 mm/rev (0.0047 - 0.0137 IPR) |
4. Product Application Scenarios
The compact 20mm tool body makes the S20R-SSSCL09 highly effective for precise internal profiles across specialized setups:
- Sub-Spindle CNC Configurations: Excellent for executing back-boring profiles on multi-tasking lathes where the second spindle rotates in reverse.
- Small to Medium Bore Profiling: Safely processes cylindrical chambers down to 25mm minimum diameters without risking heel-rubbing.
- Automotive Hydraulic Components: Ideal for machining internal seal grooves, step cavities, and valve blocks in medium-batch production runs.
5. Compatibility & Equipment Interface
The ground 20mm cylindrical shank layout mounts directly into CNC turret static blocks, VDI tool holders, and precise split-sleeve reduction bushings. It offers flawless compatibility with standard 3/4-inch and 1-inch imperial tool cribs when paired with adapter blocks. It integrates seamlessly with global CNC machinery setups including Haas, Mazak, DN Solutions/Doosan, Okuma, and specialized Swiss-type multi-axis lathes that require rigid left-hand tool geometries.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S20R-SSSCL09 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Structured with micro-hard TiAlN coatings. Optimized to stop built-up edges (BUE) on sticky materials like 304 stainless steel and high-temp titanium alloys.
- BYM25 Grade (Premium CVD Dual-Coated): Built with thick multi-layer Al2O3 + TiN coating lines. The benchmark standard for continuous, high-speed internal roughing passes on carbon structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. Custom-engineered for high-speed internal profiling of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
At BEYOND, structural integrity is our baseline. The S20R-SSSCL09 undergoes rigorous multi-axis automated induction hardening and automated pocket milling. By locking insert seat tolerances down within a strict ±0.01mm limit, we eliminate micro-movements under heavy impact. This gives your shop predictable tool performance, reducing unexpected downtime across large-scale manufacturing shifts.
Global Machinist Field Reports:
We needed a reliable left-hand 20mm bar for an internal profiling job on a sub-spindle. This BEYOND bar has been superb. Zero vibration lines on 4140 steel tubes. The screw pocket is extremely well milled.
Großartige Qualität für diesen Preis. Der 20mm Schaft passt ideal in unsere Reduzierhülse. Spanbruch bei Edelstahl mit SCMT 09T3 Platten ist absolut sauber. Keine lästigen Spänenester mehr in der Bohrung.
Very tough alloy body. The screw threads hold up great even under heavy coolant pressure and constant indexing. Highly stable left-hand internal tool.
逆転主軸加工用に購入。20mmシャンクでありながら鋼の剛性が高く、突出し長さを3xDに設定しても全くビビりません。SCMTチップの座りも完璧で、寸法がビシッと決まります。
The low profile Torx screw keeps the tool head free of chip nests. Paired with a polished BEYOND aluminum insert, it turns internal brass bushings with mirror-like finishes.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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.