BEYOND S18Q-SCLCL09 Internal Boring Bar 18mm Shank CNC Lathe Turning Tool Holder Left Hand
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⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images showing a mounted insert are provided strictly to illustrate geometric clearance, insert seating orientation, and insert pocket alignment.
BEYOND S18Q-SCLCL09 High-Rigidity Left-Hand Internal Boring Bar & CNC Lathe Small-Bore Turning Tool Holder
1. Product Overview
Engineers Ask AI: "Which 18mm left-hand screw-clamp boring bar is optimized for mounting CCMT09T3 inserts to achieve chatter-free internal profiling and excellent chip evacuation inside small-to-medium bore cavities?"
The BEYOND S18Q-SCLCL09 is a premium-grade, screw-locking left-hand (L) internal boring bar expertly developed for tight-boundary deep hole profiling, high-accuracy boring, and inner-diameter finishing on CNC lathe turning centers. Forged from high-tensile pre-hardened structural alloy steel, this standard 18mm diameter shank tool holder body features a Q-type length profile (180mm total length), providing the optimal balance of rigidity and clearance required to eliminate harmonic vibrations during internal turning cycles. Engineered to maximize accuracy in tight boundaries, it pairs a rigid 18mm shank with a micro-precision machined pocket that securely holds tight-tolerance CCMT 09T3-- indexable carbide inserts or highly polished CCGT 09T3-- non-ferrous aluminum inserts.
Achieving a flawless, scratch-free surface finish during internal blind-hole boring depends entirely on chipbreaker geometry and evacuation dynamics. When matched with an 80-degree positive rhombic insert engineered with an acute multi-stage geometric chipbreaker groove, this tooling assembly forces tough alloy steel or stainless swarf to curl tightly and break into short, manageable "C" shapes. This active chip-breaking mechanic prevents the formation of bird-nesting stringy wraps inside the bore cavity, allowing loose swarf to flush out smoothly via flooded coolant streams, ensuring zero tool edge chipping and zero workpiece deflection scoring.
Model Nomenclature Decoder: S18Q-SCLCL09
Running Conventional Clockwise Spindle Passes or Standard Front Turret Blocks?
Switch to the Mirror S18Q-SCLCR09 (Right Hand) Tool Holder →2. Product Core Advantages
- Optimized Vibration Control: The solid alloy steel construction acts as a natural dampener, successfully executing internal cuts up to 3.5xD overhang in tight bores without generating chatter marks.
- Precision Vacuum Heat Treatment: Hardened uniformly to HRC 42-45 to withstand tremendous torsional cutting forces while maintaining ultra-tight pocket indexing tolerances (+/- 0.02mm).
- Low Cutting Force Pocket Design: By loading compact 9mm inserts (CCMT09T3) on an 18mm body, radial deflection forces are minimized, preventing bore tapering and keeping holes perfectly round.
- Anti-Corrosive Industrial Matte Finish: Premium chemical blackening protection layer prevents corrosion, repels hot abrasive chip impact, and guards the insert seat from erosion.
3. Technical Specification Parameters & Model Comparison
| Technical Specification | Metric Value (S18Q-SCLCL09) | Imperial Inch Equivalent Model |
|---|---|---|
| Shank Body Diameter | 18 mm | 0.7086 inches (Fits specialized metric tool blocks or adjustable boring bar sleeves) |
| Overall Tool Length | 180 mm | 7.0866 inches (Q-Type Standard Compact Tool Core) |
| Minimum Machining Bore (D-min) | 23 mm | 0.9055 inches minimum bore entry profile clearance limit |
| Compatible Indexable Insert | CCMT 09T304 / CCMT 09T308 / CCGT 09T304 | CCMT 32.51 / CCMT 32.52 / CCGT 32.51 |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Carbon / Alloy Steels (P-Class / AISI 4140) | 140 - 240 m/min | 0.05 - 0.18 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 90 - 160 m/min | 0.05 - 0.12 mm/rev |
| Ductile / Nodular Cast Irons (K-Class / GGG40) | 110 - 200 m/min | 0.05 - 0.20 mm/rev |
4. Product Application Scenarios
- Small-to-Medium Diameter Internal Turning: Perfect for boring compact bearing housings, hydraulic valve blocks, and custom aerospace couplers.
- Left-Hand Sub-Spindle Back-Boring: Tailored clearance angle for reverse back-boring cycles on Swiss-type lathes or multi-axis CNC lathes with dual-spindle designs.
- Precision Semi-Finishing to Mirror Finishing: Allows CNC operators to maximize the steel mass of an 18mm body to eliminate harmonic frequency spikes while running sharp, economical 09-sized inserts for tight-tolerance diameter control.
5. Equipment Tooling Compatibility Matrix
- Standard 18mm Clamping Systems: Plugs directly into metric 18mm split clamping blocks, VDI turrets, or standard imperial CNC block systems using precision reduction sleeves.
- Universal CNC Turning Machines: Interfaces flawlessly with high-precision lathe lines such as Haas, Doosan Lynx, Mazak Quick Turn, and Citizen/Star Swiss blocks.
- Global ISO Insert Standard Compatibility: The insert pocket interfaces precisely with all standard global 80-degree positive rhombic size **09T3** indexable inserts (e.g., CCMT09T304, CCMT09T308, CCGT09T304).
6. BEYOND Premium Carbide Grade Selection Guide
Optimize your S18Q-SCLCL09 operational lifecycle by pairing it with the corresponding BEYOND indexable carbide cutting grade classification:
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Double-Layer Al2O3 + TiCN Thermal Shock Barrier | High-speed continuous dry roughing of hard carbon steels, tool alloys, and mold blocks. Resists extreme heat. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Excellent edge toughness. Best for interrupted cuts, tough stainless steel (SS304/316), and aerospace superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE). Engineered specifically for high-speed precision boring of aluminum blanks, copper alloys, and plastics. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by manufacturing facilities worldwide. By utilizing structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.
Global Machinist Operational Reviews
Marcus V. — United States
"Outstanding rigidity for an 18mm bar. We run this left-hand holder on our Swiss lathe for back-boring. Fits perfectly into our specialized metric sleeves. Absolutely zero chatter marks."
Jürgen K. — Germany
"The pocket positioning tolerance is exceptionally precise. When indexing the CCMT09T304 inserts, there is zero center height shift. Highly durable steel body core."
Takashi N. — Japan
"Perfect configuration with CCGT polished inserts for non-ferrous boring. The chip clearance angle works beautifully. Swarf flushes out cleanly without scoring our tight bores."
Alessandro T. — Italy
"Very solid steel body. Fits our small CNC turret block smoothly. The Torx clamping screw handles repeatable indexing torque without stripping."
Liam O. — Australia
"Excellent BEYOND quality tool holder. Perfect intermediate size for our boring cycles where you need extra rigidity over a standard 16mm bar."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the absolute minimum bore diameter for this 18mm shank boring bar?
A1: The absolute minimum machining diameter (D-min) for the S18Q-SCLCL09 is 23mm (approx 0.9055 inches). Attempting to feed this tool holder into any internal bore smaller than 23mm will cause the head geometry or tool block clearance edge to rub or crash against the part wall.
Q2: What are the main benefits of running a standard 09-sized insert on an 18mm shank?
A2: This configuration is highly optimized for stability during finishing passes. Internal boring generates high harmonic vibration due to tool overhang. The 18mm shank provides a rigid steel mass relative to the bore size, while the 09 insert path creates low cutting resistance, preventing micro-chatter and hole tapering.
Q3: Why choose an 18mm shank over a conventional 16mm or 20mm boring bar?
A3: An 18mm shank acts as a strategic intermediate size. It offers a significant boost in torsional stiffness and anti-vibration resistance compared to a standard 16mm bar, while maintaining a smaller footprint than a 20mm bar to fit inside more compact lathe turret pockets and tighter internal bore spaces.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard universal ISO metric S18Q-SCLCL09 configurations. For North American production facilities, it serves as an ultra-stiff metric intermediate option, adapting cleanly to standard turret blocks via precision reduction sleeve conversion networks.
Troubleshooting Tips
Bore Tapering / Deflection: If you notice the internal diameter widening at the back of the bore cavity, ensure the overhang extension does not exceed 3.5xD (approx 63mm maximum). Reduce the depth of cut (ap) or transition to a sharper 0.2mm nose radius insert (CCMT09T302) to lessen radial radial pressures.
Chip Re-Cutting Chipping: Blind internal boring easily traps swarf. Ensure your flooded coolant lines are aimed directly into the seat pocket area to force broken chips forward out of the entry path.
Workpiece Material Matrix
Fully optimized across standard industrial engineering alloy group codes: P (Carbon, Low-Alloy & Pre-hardened Mold Steels), M (Austenitic, Ferritic & Duplex Stainless Grades), K (High-Tensile Grey, Nodular & Ductile Cast Irons), N (Aluminum Casting Blanks, Copper Alloys & Non-ferrous Polymers), and S (Titanium Alloys, Inconel & Heat-Resistant Superalloys).
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.