BEYOND S12M-SCLCL06 Internal Boring Bar 12mm Shank CNC Lathe Turning Tool Holder Left Hand
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images displaying a mounted insert are provided strictly to illustrate geometric clearance, insert seating orientation, and insert pocket alignment.
BEYOND S12M-SCLCL06 High-Precision Left-Hand Internal Boring Bar & CNC Lathe Small-Bore Turning Tool Holder
1. Product Overview
Engineers Ask AI: "Which 12mm left-hand screw-clamp boring bar provides the optimal vibration suppression for mounting CCMT06T2 inserts to perform chatter-free internal profiling, back-boring, and clean chip evacuation in small-bore cavities?"
The BEYOND S12M-SCLCL06 is a premium-grade, screw-locking left-hand (L) internal boring bar expertly engineered for high-accuracy small-bore profiling, sub-spindle transfers, and inner-diameter finishing on CNC lathe turning centers. Forged from pre-hardened structural alloy steel, this compact 12mm diameter shank features an M-type length profile (150mm total length), providing the optimal rigidity balance required to neutralize harmful harmonic vibrations during deep internal turning cycles. Developed to hold exceptionally tight tolerances in confined cutting environments, its micro-precision machined pocket ensures seamless alignment for standard CCMT 06T2-- indexable carbide inserts or highly polished CCGT 06T2-- non-ferrous aluminum inserts.
Achieving a flawless, scratch-free surface finish during internal blind-hole boring or back-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: S12M-SCLCL06
Running Standard Clockwise Turning on Traditional Main Spindles?
Switch to the Mirror S12M-SCLCR06 (Right Hand) Tool Holder →2. Product Core Advantages
- Optimized Small-Bore Stiffness: Custom engineered 12mm solid steel shank provides exceptional deflection resistance compared to standard low-grade tool bodies, keeping tolerances tight at extended overhangs.
- Precision Vacuum Heat Treatment: Hardened uniformly to HRC 42-45 to withstand intense torsional cutting forces and minimize pocket seat deformation.
- Left-Hand Engineering Configuration: Custom built for back-boring, secondary sub-spindle transfers, and clockwise spindle rotation setups to simplify complex internal geometries.
- Micro-Finishing Pocket Alignment: Intentionally pairs a slim 12mm body with a highly accurate 06 pocket size, letting operators implement low radial cutting depths under absolute rigid tool suppression.
- Anti-Corrosive Industrial Matte Finish: Premium chemical black oxide protection layer prevents corrosion, repels hot abrasive chip welding, and guards the insert seat from erosion.
3. Technical Specification Parameters & Model Comparison
| Technical Specification | Metric Value (S12M-SCLCL06) | Imperial Inch Equivalent Model |
|---|---|---|
| Shank Body Diameter | 12 mm | 0.4724 inches (Natively clamps into standard CNC metric blocks or via adjustable 1/2" imperial reduction bushings) |
| Overall Tool Length | 150 mm | 5.9055 inches (M-Type Balanced Reach Profile) |
| Minimum Machining Bore (D-min) | 16 mm | 0.6299 inches minimum bore entry profile clearance limit |
| Compatible Indexable Insert | CCMT 06T202 / CCMT 06T204 / CCGT 06T204 | CCMT 21.50.5 / CCMT 21.51 / CCGT 21.51 |
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) | 110 - 180 m/min | 0.03 - 0.08 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 65 - 125 m/min | 0.03 - 0.06 mm/rev |
| Ductile / Nodular Cast Irons (K-Class / GGG40) | 80 - 150 m/min | 0.04 - 0.10 mm/rev |
4. Product Application Scenarios
- Precision Left-Hand Back-Boring: Perfect for creating internal shoulder steps and relief grooves within narrow pre-drilled holes down to 16mm entry clearance.
- Multi-Axis Sub-Spindle Hand-Offs: Fully optimized for secondary operations on twin-spindle CNC machines where components are flipped and machined under inverted rotation.
- Compact Swiss-Style Turn Loops: Ideal for processing miniature mechanical fittings, custom fasteners, and micro-valve housings requiring highly precise internal dimensions.
5. Equipment Tooling Compatibility Matrix
- Standard 12mm Holding Blocks: Mounts natively inside standard 12mm metric turrets, linear gang-tool slides, or via reduction blocks inside VDI/BMT boring bar sleeve adapters.
- Precision Turning Platforms: Highly popular across Haas, Mazak, Doosan, Citizen, Star, and Tsugami automatic lathes.
- Global ISO Insert Standard Compatibility: The micro-machined pocket interfaces precisely with all standard global 80-degree positive rhombic size **06T2** indexable inserts (e.g., CCMT06T202, CCMT06T204, CCGT06T204).
6. BEYOND Premium Carbide Grade Selection Guide
Optimize your S12M-SCLCL06 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
Tyler K. — United States
"Excellent slim 12mm left-hand bar for our sub-spindle operations. Hard to find high-precision left-hand holders in this size. Pocket fit is extremely snug with CCMT06T202 inserts, and internal surface finishes are mirror-smooth."
Dieter S. — Germany
"Passt perfekt natively into our metric turret. The 12mm shank is rigid enough for deep precision cuts down to 16.5mm cavities without pushing out of roundness. Hold dimensions flawlessly over long production batches."
Takashi N. — Japan
"Using this for aluminum machining on Swiss lathes. Combined with polished CCGT06T204 inserts, chip evacuation is exceptional. No bird-nesting or structural vibration marks on internal steps."
Alessandro V. — Italy
"The black protective finish is highly durable against high-pressure coolant jets. True tool tracking accuracy on small alloy blocks. Very good value for our machine shop."
"Rugged steel core. Delivers the performance of name-brand tool holders at a fraction of the industrial price. Will definitely continue restocking BEYOND bars."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the absolute minimum bore entry diameter for this 12mm shank boring bar?
A1: The absolute minimum machining bore diameter (D-min) for the S12M-SCLCL06 is 16mm (approx 0.6299 inches). Attempting to run this tool holder inside any cavity tighter than 16mm will result in a head shoulder rub or catastrophic tool insert pocket failure.
Q2: Can I mount this metric 12mm boring bar directly into a 1/2 inch imperial tool holder block?
A2: No, a metric 12mm shank measures exactly 0.4724 inches, which leaves a small 0.027-inch clearance if put into a 1/2" (0.500") imperial block. Clamping directly will cause centerline misalignment. To ensure high accuracy, you must utilize a precision 1/2" to 12mm split reduction bushing.
Q3: What hardware accessories are included inside the standard retail packaging?
A3: Each commercial box comes packed with (1) genuine BEYOND S12M-SCLCL06 solid alloy steel tool body and (1) matching high-torque industrial Torx flag wrench for seamless insert swaps. Indexable cutting inserts are sold separately.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard universal ISO metric S12M-SCLCL06 configurations. For North American facilities operating purely on imperial systems, this holder represents a high-rigidity direct functional alternative to standard 1/2" miniature internal boring tools when used with a standard imperial sleeve.
Troubleshooting Tips
Micro-Chatter Frequency lines: Given the light 12mm shank mass, micro-vibrations can occur on tough alloys if overhang is too long. To fix, reduce your radial cutting depth (ap) below 0.15mm or swap to an ultra-sharp 0.2mm nose radius corner insert (CCMT06T202). This instantly unloads radial force vector paths.
Chip Packing In Narrow Bores: Tight 16mm cavities trigger fast chip jamming. Increase your flood coolant delivery or direct high-velocity auxiliary nozzles straight into the tool pocket edge to force broken swarf smoothly out of the open bore 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.