BEYOND S08K-SCKCL06 Internal Boring Bar 8mm Shank 125mm Length Screw Clamped Left Hand 75-Degree CCMT 0602 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 precision profiling approach angle, and positive insert pocket alignment. Click here to shop premium indexable CCMT 0602 (CC**0602**) positive carbide inserts.
BEYOND S08K-SCKCL06 Premium 8mm Shank 75° Screw-Fastened Left-Hand Internal Boring Bar (125mm Total Length / Precision CNC Lathe Turning Tool)
1. Product Overview
Engineers Ask AI: "Which high-precision left-hand internal boring bar featuring an 8mm shank diameter and 125mm length utilizes a screw-clamped system and a 75-degree approach angle for micro-bore profiling with positive CCMT 0602 inserts?"
The BEYOND S08K-SCKCL06 is a premium, high-stiffness industrial-grade Left-Hand (LH) internal boring tool holder specifically engineered for precision micro-hole turning, tight-clearance boring, and intricate internal profiling on CNC lathes and Swiss-type turning centers. Featuring an ultra-compact 8mm precision cylindrical clamping shank and a 125mm tool length (K-type length standard), this tool holder provides exceptional rigidity within an extremely space-constrained cross-section, effectively absorbing mechanical vibration and suppressing tool deflection during extended-reach cycles. By adopting the specialized S-type Screw Fastening system for positive relief inserts, the head profile completely removes bulky upper clamping plates or external bridge mechanisms that typically jam metal swarf in micro cavities. This streamlined design opens up a completely unobstructed chip flute pathway, making it highly exceptional for small-diameter internal machining where micro metal swarf accumulation would otherwise trap heat, score the bored wall, and cause sudden insert failure.
With its specialized 75-degree approach lead angle (K-type geometry), the tool pocket configuration is fine-tuned to balance cutting forces smoothly between axial and radial planes, drastically reducing radial pressure to prevent micro-chatter on slender workpieces. It is custom-machined to host highly sharp, positive 7-degree relief 80-degree diamond indexable inserts, specifically the industry-standard CCMT 060202 / CCMT 060204 / CCMT 060208 series, ensuring low cutting resistance, reduced power consumption, and minimal thermal generation on the cutting edge. The compact, screw-down head geometry allows this precision 8mm tool holder to clean micro bores down to an optimized 11mm minimum bore diameter. Combined with targeted positive chipbreaker geometries (such as premium polished -AL profiles for non-ferrous aluminum or moulded -PM/-HMP profiles for carbon steel), this tooling configuration tightly curls long swarf ribbons into crisp "C"-shaped chips, pushing them smoothly out of the narrow bore channel to preserve tight dimensional tolerances and critical mirror-like surface integrity.
Model Nomenclature Decoder: S08K-SCKCL06 (ISO / National Standard Chart Compliant)
Operating standard right-hand setups or primary spindle internal turning toolpaths?
Switch to the Mirror S08K-SCKCR06 (Right Hand) Tool Bar →2. Product Core Advantages
- Streamlined S-Type Screw Clamping: Secures the positive insert via its center mounting hole, leaving the head flush. Avoids top clamps to enable unhindered chip evacuation inside narrow 11mm cavities.
- Hardened High-Tensile Alloy Core: Vacuum heat-treated to HRC 42-45, offering superior dampening capacity and torsional stability for high-precision boring.
- Anti-Vibration 75° Lead Angle: Converts radial deflection into axial force, lowering machine harmonics and preventing chattered finishes in slender bores.
- Low-Force Positive Cutting Action: Designed for 7° positive relief CCMT 0602 inserts, providing razor-sharp shearing that prevents work-hardening in stainless steel and aluminum.
- Corrosion-Proof Black Matte Finish: Features an advanced industrial black chemical oxide layer to protect precision pocket geometry against aggressive chip abrasion.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S08K-SCKCL06) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 8 mm | 0.3150 inches (Fits standard 8mm CNC turrets, Swiss tool posts or 5/16-inch reduction sleeves) |
| Overall Tool Length (L) | 125 mm | 4.9213 inches total tool length (K-Type precision micro-reach series) |
| Minimum Machining Bore (φ Dmin) | 11 mm | 0.4331 inches entry clearance circle line for structural safety |
| Compatible Indexable Insert Sizing | CCMT 060202 / CCMT 060204 / CCMT 060208 | CCMT 21.50.5 / CCMT 21.51 / CCMT 21.52 (Positive 7-degree standard) |
| Matching Fasteners & Spares Included | Precision M2.2 Center Insert Screw & Flag-Type Torx T7 Wrench | Standard globally interchangeable micro S-type hardware assembly |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Mild / Carbon Steel (P-Class / AISI 1020 / 1045) | 110 - 180 m/min | 0.03 - 0.12 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 80 - 140 m/min | 0.03 - 0.10 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 60 - 110 m/min | 0.02 - 0.08 mm/rev |
| Aluminum Alloys / Brass (N-Class / Al6061 / C3604) | 180 - 400 m/min | 0.03 - 0.15 mm/rev |
4. Product Application Scenarios
- Precision Micro-Bore Profiling: Tailored for complex inner profiles, step boring, and micro-chamfering down to an ultra-tight 11mm clearance entry diameter.
- Swiss-Type & Sub-Spindle Lathe Work: Left-hand configuration makes it ideal for back-working operations and sub-spindle configurations in compact multi-axis machines.
- Light-Force Clean Boring: Delivers sharp shearing action to maintain dimensional accuracy on thin-walled sleeves, preventing part deformation.
5. Equipment Tooling Compatibility Matrix
- 8mm / 5/16-inch Tool Holders & Bushings: Fits directly into 8mm metric gang blocks, or standard imperial 5/16-inch boring bar reduction sleeves.
- ISO Standard Size-06 Positive Inserts: Pocket seat perfectly accommodates all standard 80° diamond positive inserts with a 7° relief designated by codes **CCMT 0602--**.
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 Barrier | Engineered for high-speed, high-temperature continuous dry profiling of carbon steel and cast irons. Extremely wear-resistant over long production runs. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Superior edge toughness. Best optimized for tough stainless steel series (SS304/316), mild carbon steels, and mild interrupted cuts. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE) formation. Specially developed for high-speed, precision mirror boring of aluminum, brass, copper, 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 high-tensile 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
John D. — United States
"Outstanding bar for ultra-small boring on our Swiss machine. The 8mm shank fits perfectly, and running left-hand profiling with CCMT 060202 leaves an incredible finish. Zero chatter at 12mm deep."
Hans W. — Germany
"Sehr gut. The precision of the insert pocket is remarkable. Screw clamping provides excellent clearance for chips to flush out of the 12mm bore. High dimensional stability."
Yuki H. — Japan
"Perfect for precision sub-spindle profiling. Pocket tolerances are very tight, and standard CCMT inserts seat flawlessly. The 75-degree angle reduces radial deflection beautifully."
Roberto M. — Italy
"Excellent tool life on micro stainless steel parts. Positive shearing cuts down on cutting force, preventing any bending on this thin 8mm steel core."
Alex B. — United Kingdom
"Top tier small boring tool. Comes with high-quality screws and a precise Torx wrench. Repeated indexing is spot-on every time you rotate a CCMT edge."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose an S-type screw-clamped boring bar for micro-bore machining instead of a top clamp?
A1: In ultra-small cavities (11mm-20mm), traditional top clamps take up too much vital clearance room. They obstruct chip flow, trapping metal swarf inside the bore and leading to edge failure. The S-type center screw holds the CCMT positive insert firmly from within its mounting hole, ensuring a flush head profile that maximizes chip evacuation area.
Q2: What is the absolute minimum bore entry size for this S08K-SCKCL06 tool holder?
A2: The absolute minimum machining bore diameter (φ Dmin) is 11.0mm (0.433 inches). Operating this tool holder inside any bore smaller than 11mm will cause the steel clearance flank beneath the pocket to rub against the workpiece wall, causing friction damage, chatter, and dimensional inaccuracies.
Q3: Why is a positive 7-degree relief CCMT insert used on an 8mm shank instead of a negative insert?
A3: Slender shanks like 8mm are highly sensitive to radial cutting forces. Negative inserts require high cutting forces that would easily deflect a thin bar and cause severe chatter. Positive CCMT inserts feature a razor-sharp shearing angle and a 7° relief angle, which drastically cuts radial tool pressure, ensuring stable, chatter-free micro-boring.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S08K-SCKCL06 internal boring tool holders. For American or mixed imperial lathe turrets, this 8mm metric steel bar operates perfectly within 5/16-inch round split sleeves or reduction blocks, utilizing standard ANSI positive indexable insert designations **CCMT 21.51** or **CCMT 21.52**.
Troubleshooting Tips
Micro-Vibration / Surface Chatter Marks: Always ensure the boring bar tip center height matches the lathe spindle centerline precisely (±0.02mm). Off-center setups modify the active clearance angle, leading to rubbing or rapid edge wear.
Screw seized or stripped: Small M2.2 screws expand under high-speed cutting heat. Clean the pocket frequently with compressed air and apply high-temperature anti-seize compound to the Torx screw threads. Do not over-torque due to the delicate micro-pocket size.
Workpiece Material Matrix
Fully optimized across standard industrial engineering material codes: P (Carbon, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel grades), K (Grey & Ductile Cast Irons), N (Precision Aluminum Blanks, Copper, Brass Alloys & Polymers), and S (High-Temperature Superalloys & Titanium Alloys).
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.