BEYOND S08K-SCLCL06-A12 Internal Boring Bar 8mm 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 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).
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.