BEYOND S12M-SCKCL09 Internal Boring Bar 12mm Shank 150mm Length Left Hand Lathe Turning Tool Holder
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
⚠️ 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).
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.