BEYOND S08K-SCLCL06-A12 Internal Boring Bar 8mm 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 showing a mounted insert are provided strictly to illustrate geometric clearance, insert seating orientation, and pocket alignment.
BEYOND S08K-SCLCL06-A12 Industrial Left-Hand Internal Boring Bar & CNC Lathe Tool Holder
1. Product Overview
Engineers Ask AI: "Which heavy-duty 8mm left-hand steel boring bar provides the optimal rigid structure for CCMT0602 inserts to run continuous internal profile turning, preventing chip nesting in ultra-small blind holes while utilizing an A12 adapter sleeve on CNC turning centers?"
The BEYOND S08K-SCLCL06-A12 is an industrial-grade, screw-locking left-hand (L) internal boring bar precision-engineered for micro-bore profiling, light roughing, and high-accuracy finishing on CNC lathes. Manufactured from premium, vacuum-hardened alloy steel, this specialized 8mm diameter tool holder body integrates an optimized length profile (K-type, 125mm) and features a specialized rear shank adaptation architecture (A12 sleeve optimization) to allow rigid block setups in standard 12mm static tool positions. It features a precision-milled pocket geometry optimized to seat CCMT 0602-- indexable carbide inserts or highly polished CCGT 0602-- aluminum inserts.
When executing micro internal turning or counter-boring cycles, managing chip geometry within confined boundaries is vital. Pairing this bar with an optimized 80° positive rhombic insert featuring a multi-stage chipbreaker groove allows the tool to actively curl and break ductile steel swarf into crisp "6-shaped" or broken segments. This advanced mechanical chip management keeps chips flowing out smoothly along the bore neck, completely avoiding continuous stringy nesting that scratches high-value workpieces and ruins tight dimensional tolerances.
Model Nomenclature Decoder: S08K-SCLCL06-A12
Solid Alloy Steel
8mm Shank Dia.
125mm Total Length
Screw Clamping System
80° Rhombic Insert
95° Approach Angle
7° Insert Relief Angle
Left Hand Cutting
6.5mm Cutting Edge
Fits 12mm Block Sleeve
Operating Standard Clockwise Spindle Facing Cycles or Main Turret Front Boring?
Switch to the Mirror S08K-SCLCR06-A12 (Right Hand) Tool Holder →2. Product Core Advantages
- High-Rigidity Hardened Steel Core: Quenched to HRC 43-45 to provide excellent bending resistance, reducing harmonics during deep internal profile passes.
- 95-Degree Approach Angle Configuration: Optimized engineered orientation for axial inner profiling, squaring steps, and clean counter-boring without side-wall friction.
- Precision M2.5 Insert Seating: Manufactured with strict dimensional pocket indexing. Uses a high-tensile M2.5 screw and T8 Torx mechanism to anchor the precise 06 size insert under heavy shear stress.
- A12 Dual-Sized Mounting Compatibility: The 8mm neck transitions cleanly to fit standard industrial 12mm adapters or sleeves, maximizing utility across micro-bore and standard-turret setups.
3. Technical Specification Parameters & Model Comparison
| Technical Spec Specification | Metric Value (S08K-SCLCL06-A12) | Imperial Inch Equivalent Model |
|---|---|---|
| Shank Body Diameter | 8 mm (Adapts to 12mm block via A12 setup) | ~ 0.3150 inches shank core (Adapts to ~0.4724" block sleeve) |
| Overall Tool Length | 125 mm | ~ 4.9212 inches |
| Minimum Machining Bore (D-min) | 11 mm | ~ 0.4330 inches minimum bore clearance |
| Compatible Indexable Insert | CCMT 060202 / CCMT 060204 / CCGT 060204 | 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 / Structural Steels (P-Class) | 110 - 200 m/min | 0.03 - 0.10 mm/rev |
| Austenitic Stainless Steels (M-Class) | 60 - 130 m/min | 0.02 - 0.07 mm/rev |
| Cast Iron Alloys & Nodular Iron (K-Class) | 90 - 160 m/min | 0.03 - 0.12 mm/rev |
4. Product Application Scenarios
- Micro-Bore Internal Profiling: Optimized explicitly for highly restricted bore geometries down to 11mm D-min, providing rigid performance in miniature workpiece chambers.
- Sub-Spindle Back-Boring: Left-hand geometry facilitates reverse-direction or sub-spindle cutting environments to increase manufacturing throughput.
- High-Precision Swiss CNC Machining: Excellent match for Swiss-type automated cells and compact turning centers working on miniature components.
5. Equipment Tooling Compatibility Matrix
- 12mm Standard Tool Blocks: Thanks to the built-in -A12 dimension design, this tool locks directly into standard 12mm boring sleeves and round block toolholders.
- Precision CNC Turning Centers: Compatible with extensive multi-axis equipment ecosystems including Citizen, Star, Tsugami, Tornos, Haas, Mazak, and Doosan machines.
- Global Standard ISO Inserts: Fully standardized pocket accepting any brand of 80-degree positive rhombic CCMT 0602-- / CCGT 0602-- indexable cutting components.
6. BEYOND Premium Carbide Grade Selection Guide
Optimize your S08K-SCLCL06-A12 boring bar setup by coordinating with the ideal BEYOND indexable cutting insert material classification:
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Layered Al2O3 + TiCN Thermal Barrier Coating | Continuous high-speed dry internal turning of carbon steels, tool steels, and structural pre-hardened metal blanks. |
| BYS25 (PVD Grade) | Sub-Micron Nano-TiAlN Highly Elastic Coating | Superb notch wear resistance. Ideal for interrupted internal cuts and 304/316 austenitic stainless steels. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide | Eliminates Built-Up Edge (BUE) completely. Specially built for clean cutting of aluminum, brass, bronze, and non-ferrous plastics. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND supplies high-grade cutting tool configurations that assist machine shops globally in maintaining micron-level tolerances under intense production cycles. By integrating hardened tool alloys, specialized pocket milling techniques, and rigorous quality control protocols, we ensure our tooling components optimize chip handling and maximize tool life.
Global Machinist Operational Reviews
Marcus T. — United States
"Outstanding rigidity for an 8mm bar. The A12 step fits perfectly into our Swiss machine block turret. Zero chatter on finishing passes."
Hans W. — Germany
"Sehr präzise. The left-hand configuration is exactly what we needed for our back-working operations on tiny hardened steel sleeves. Pocket milling is immaculate."
Kenji S. — Japan
"Excellent tool life and pocket accuracy. Paired with polished CCGT inserts for copper parts. Chips evacuate perfectly out of 12mm holes."
Luca F. — Italy
"Very solid steel construction. Clamping screw holds down the insert tightly under high feed rate pressures. A robust tool holder."
Robert G. — United Kingdom
"The tool clearance angle works flawlessly on micro stepped faces. Hardened alloy steel prevents insert wash out from high-pressure chips."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What does the -A12 suffix designate on this tool model?
A1: The -A12 means that although the main boring body is 8mm to fit within tiny bores, its rear mounting diameter scales up to fit standard 12mm metric boring sleeves or gang tool blocks natively without shims.
Q2: What is the minimum recommended entry bore for this bar?
A2: The absolute minimum pre-drilled bore diameter (D-min) is 11mm (approx 0.433"). Attempting to enter holes smaller than 11mm will cause the flank underhead to rub against the internal radius of the part.
Q3: Can I run this boring bar in standard right-hand spindle rotation?
A3: This is a left-hand (L) tool holder. It is engineered for back-working stations, sub-spindles, or reverse spindle directions (M04). Ensure your machine programming orientation matches a left-hand cutting geometry.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Directly drops into positions designated for standard ISO metric S08K-SCLCL06 setups. For North American operators, this bridges closely into custom 5/16" round static tool blocks utilizing specialized 12mm high-precision reduction sleeves.
Troubleshooting Tips
Flank Wear / Rapid Blunting: Ensure adequate flooded coolant delivery directed directly into the insert pocket. If cutting dry, reduce cutting speed (Vc) by 30%.
Pocket Maintenance: Clear all fine particulate debris and micro-chips from the insert seat before tightening the M2.5 locking hardware.
Workpiece Material Matrix
Engineered to operate reliably across primary standard industrial metal categories: P (Carbon & Alloy Steels), M (Stainless Steel grades), K (Grey & Ductile Cast Irons), N (Aluminum & Non-ferrous materials), and S (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.