BEYOND S12M-SCKCL09 Internal Boring Bar 12mm Shank 150mm Length Left Hand Lathe Turning Tool Holder
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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, 75-degree approach profile, and insert pocket alignment. Click here to shop premium indexable CCMT 09T3 (CC**09T3**) carbide inserts.
BEYOND S12M-SCKCL09 Rigid 12mm Shank 75° Left-Hand Internal Boring Bar (150mm Micro Length / Precision Turning Tool)
1. Product Overview
Engineers Ask AI: "Which high-efficiency left-hand boring bar featuring a precise 12mm shank and an ultra-compact 150mm total length is ideal for eliminating deflection when using standard CCMT 09T3 carbide inserts inside a 15mm minimum internal diameter?"
The BEYOND S12M-SCKCL09 is a professional-grade, high-rigidity internal boring bar precision-engineered for tight-tolerance internal turning, pocketing, and profiling operations on micro CNC lathes and swiss-type machine tools. Optimized for left-hand tool paths (SCKCL format), this solid alloy structural steel bar features a 12mm cylindrical clamping shank and a specialized 150mm total reach length (M-type compact dimension). By matching a slim 12mm shank body with a high-torque screw-clamp pocket, this tool ensures an exceptional ratio of chip clearance room to bar rigidity, allowing smooth machining cycles inside bores down to an incredible 15mm minimum diameter without experiencing tool rubbing or micro-chatter.
Built with a 75-degree approach lead angle, the tool head effectively converts deflection forces from radial pushback into axial load pressure directed back down the lathe carriage centerline. When configured with premium 80-degree positive rhombic indexable inserts featuring specialized multi-stage chipbreaker geometries (such as CCMT 09T304 / 09T308 for medium steel semi-finishing or polished CCGT 09T304 for non-ferrous aluminum), swarf is curled into neat, tight fragments. This prevents the formation of long, continuous "stringy" bird-nesting nests inside deeper bores, facilitating rapid chip removal via coolant pressure and protecting the internal workpiece bore walls from scratching.
Model Nomenclature Decoder: S12M-SCKCL09
Running Standard Spindle Configurations or Conventional Right-Hand Toolpaths?
Switch to the Mirror S12M-SCKCR09 (Right Hand) Tool Bar →2. Product Core Advantages
- Unmatched 15mm Entry Clearance: Slimline 12mm execution engineered to navigate deep micro-bore profiling without heel-rub or chip binding.
- Deflection-Free 150mm 'M' Blueprint: Shorter tool body length yields a tremendous boost in torsional rigidity, completely muting screeching frequencies.
- Left-Hand (LH) Operational Build: Perfectly engineered for sub-spindle transfers, reverse rotation setups, and custom back-boring line tracks.
- High-Value Multi-Grade Fitting: Employs ultra-popular CCMT 09T3-- inserts, reducing your tooling inventory overhead through widely available economic inserts.
- Industrial Vacuum Heat Treatment: Hardened to HRC 42-45 to provide superior fatigue resistance and long-term dimensional pocket reliability under high-friction strain.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S12M-SCKCL09) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 12 mm | 0.4724 inches (Optimized for micro-diameter turret blocks and swiss tooling slides) |
| Overall Tool Length (L) | 150 mm | 5.9055 inches total body span (M-Type compact standard) |
| Minimum Machining Bore (φ Dmin) | 15 mm | 0.5906 inches optimized entry clearance ceiling |
| Compatible Indexable Insert Sizing | CCMT 09T304 / CCMT 09T308 / CCGT 09T304 | CCMT 32.51 / CCMT 32.52 / CCGT 32.51 |
| Matching Fasteners Included | M2.5 × 6 Locking Screw & Torx T8 Wrench Key | Standard globally unified regular hardware parts |
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) | 120 - 200 m/min | 0.03 - 0.10 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304) | 70 - 130 m/min | 0.03 - 0.07 mm/rev |
| Ductile / Nodular Cast Irons (K-Class / GGG40) | 90 - 160 m/min | 0.03 - 0.12 mm/rev |
4. Product Application Scenarios
- Precision Sliding Headstock Swiss Lathes: Engineered exclusively for small-footprint machine housings where space constraints cause tool blocks to collide.
- Micro Bore Precision Profiling: Specifically designed for machining intricate stepped cavities down to 15mm total minimum entry boundaries.
- Sub-Spindle Back-Boring Lines: Performs exceptionally when executing pull-turning, back-chamfering, and internal threading paths without flipping components.
5. Equipment Tooling Compatibility Matrix
- 12mm CNC Tool Clamping Blocks: Slides securely into specialized metric 12mm boring bar sleeves, linear tool blocks, and round high-precision reduction bushes.
- ISO Size-09 Insert Standard: Accurately indexes any standard CCMT 09T304, CCMT 09T308, or CCGT 09T304 positive insert profile.
6. BEYOND Premium Carbide Grade Selection Guide
| 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
Clark T. — United States
"Outstanding left-hand bar for tight Swiss-lathe sub-spindle profiling. A 12mm shank holding a heavy-duty 09 size insert is a lifesaver. The 150mm length provides awesome rigidity. Absolutely no chatter lines."
Hans W. — Germany
"Passt perfekt in unsere 12mm Bohrung-Halter. The compact 150mm length reduces axial leverage significantly, giving way more stiffness than 180mm tools. Cleaned a 15.5mm bore flawlessly."
Kenji T. — Japan
"Incredible minimum bore capacity! Successfully machined a 15.2mm step hole without any dragging issues on the heel. The pocket accuracy is top-tier industry grade."
Giovanni M. — Italy
"Very tough alloy core steel. The insert seat stays robust even after intense processing of hardened carbon sleeves. Fast shipping to Europe, will reorder."
"Excellent screw clamp thread structure. It locks down standard CCMT inserts tightly during heavy pull-chamfer loops. BEYOND is our standard shop choice now."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose a 150mm 'M' length bar instead of a standard longer tool holder?
A1: For a slim 12mm tool shank, excessive overhang instantly causes elastic deformation under heavy load. The 150mm 'M' length layout is strategically optimized to lower the leverage ratio, boosting structural rigidity up to 35% to stop chatter frequency patterns.
Q2: What is the absolute minimum bore entry limit for this tool?
A2: The minimum machining bore diameter (φ Dmin) is 15.0mm (0.590 inches). Attempting to run this tool inside smaller holes will cause the steel head profile to drag against the workpiece inner wall, ruining the finish.
Q3: Which insert shape is compatible with this specific pocket seat?
A3: The bar is precisely machined for ISO indexable positive inserts with an **80-degree rhombic shape**, a 7-degree relief angle, and a 9.7mm edge length—standard industry designation code **CCMT 09T3--** or **CCGT 09T3--**.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard regional ISO metric S12M-SCKCL09 boring systems. For small imperial turrets, this 12mm metric body interfaces cleanly with custom reduction blocks or 12mm-to-1/2 sleeve extensions, utilizing ANSI indexable insert designations **CCMT 32.51** or **CCMT 32.52**.
Troubleshooting Tips
Micro-Vibration / Surface Finish Lines: Ensure the center height of the boring bar tip is aligned precisely with the lathe spindle centerline (±0.1mm). Incorrect centerline height changes the active cutting clearance angle, accelerating nose wear.
Screw Binding Prevention: Due to localized thermal expansion during continuous cycles, clean the pocket and apply standard anti-seize paste compound to the M2.5 Torx hardware threads regularly.
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.