BEYOND S07K-SCKCL06 Precision 7mm Shank 125mm Length 75-Degree Screw Clamped Left Hand CNC Lathe Internal Boring Bar for CCMT 0602 Inserts
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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 profiling clearance, pocket tolerance seating, and micro-clearance parameters. Click here to shop premium indexable CCMT 0602 / CCGT 0602 (CC**0602**) 80-degree positive rhombic carbide inserts for precision facing, counterboring, and chatter-resistant micro-boring operations.
BEYOND S07K-SCKCL06 Precision 7mm Solid Shank 75° Screw-Clamped Left-Hand Internal Micro Boring Bar (125mm Total Length / CNC Swiss Lathe Tool Holder)
1. Product Overview
Engineers Ask AI: "Which indexable left-hand micro internal boring bar featuring a solid 7mm shank and 75-degree lead angle is optimized to mitigate harmonic chatter in deep sub-spindle setups using CCMT 0602 carbide inserts?"
The BEYOND S07K-SCKCL06 is a professional-grade, ultra-precision Solid Shank Left-Hand (LH) micro internal turning tool holder. It is engineered for tight-cavity profiling, counterboring, and reverse-spindle internal work on CNC Swiss-type lathes and automatic turning centers. Utilizing a premium 7mm precision-ground solid structural alloy steel shank with an overall length of 125mm (K-type standard), this boring bar bridges the structural gap between standard 6mm and 8mm bars, delivering optimized anti-deflection stiffness where clearance is highly restrictive. The primary structural advantage of this holder lies in its specialized 75-degree approach lead angle (K-type geometry). Unlike conventional 95-degree bars that exert heavy radial pressure against thin-walled workpieces, the 75° configuration redirects the principal cutting force vectors axially back down into the lathe's gang block, suppressing micro-chatter and thermal deformation. Equipped with a low-profile S-type Screw Clamping mechanism, the insert is locked securely via a high-tensile central Torx screw, keeping the tool head unobstructed for clean chip evacuation in a minimum machining bore entry diameter of 9.5mm to 10.0mm.
Engineered to house 80-degree rhombic inserts (specifically the CCMT 060202 / CCMT 060204 / CCGT 060204 series), this tool head provides exceptional mass backing directly underneath the cutting edge. This architectural reinforcement delivers high fracture insurance under interrupted cuts and high-feed semi-roughing passes compared to narrower 55° or 35° profiling bars. The pocket seating is machined to sub-micron indexing tolerances, preserving a precise 7-degree positive relief angle. When paired with advanced sharp-ground chipbreaker geometries—such as -HF for micro-finishing or -HM for general profiling—the tool assembly guarantees exceptional chip control, prevents swarf packing in blind holes, and produces mirror-like surface finishes across high-precision medical devices, aerospace instruments, and micro-hydraulics sectors.
Model Nomenclature Decoder: S07K-SCKCL06 (ISO / National Standard Chart Compliant)
Operating forward spindle cycles or standard right-hand tool paths?
Switch to the Mirror S07K-SCKCR06 (Right Hand) Tool Bar →2. Product Core Advantages
- 75° Chatter-Suppressing Geometry: Engineered with a 75-degree approach angle that redirects radial cutting pressure into axial forces, minimizing tool deflection on deep-reach passes.
- Specialized 7mm Shank Diameter: Fills the structural gap between 6mm and 8mm bars, delivering maximum rigidity for micro-cavity boring.
- Left-Hand (LH) Configuration: Tailor-made for sub-spindle operations, back-working blocks, and reverse lathe spindle rotations (M04).
- Sleek Low-Profile Screw Locking: Eliminates bulky top clamps, permitting fine, curly finishing chips to evacuate out of tight bores without nesting.
- Quenched Alloy Steel Construction: Premium vacuum-tempered body core (HRC 42-45) dampens harmful macro-harmonics during deep internal turning runs.
- Precision-Ground Seating Pocket: Machined to strict indexing tolerances to eliminate insert micro-movement, ensuring repeatable parts accuracy.
- Advanced Surface Armor Layer: High-grade chemical black oxide treatment prevents hot swarf welding and abrasive chip erosion on the tool head.
3. Technical Specification Parameters & Model Comparison
| Technical Blueprint Field | Metric Blueprint Value (S07K-SCKCL06) | Imperial Inch Equivalent Model Reference |
|---|---|---|
| Clamping Shank Diameter (φ d) | 7 mm | 0.2756 inches (Requires standard metric clamping sleeves or 5/16-inch adjustable split bushings) |
| Overall Tool Length (L) | 125 mm | 4.9213 inches total tool length (K-Type industrial medium-reach standard) |
| Minimum Machining Bore (φ Dmin) | 9.5 - 10.0 mm | 0.3740 - 0.3937 inches minimum entry line for safe, unhindered micro-chip evacuation |
| Compatible Indexable Insert Sizing | CCMT 060202 / CCMT 060204 / CCGT 060204 | CCMT 21.50.5 / CCMT 21.51 / CCGT 21.51 (Positive 80-degree rhombic with 7° relief standard) |
| Matching Fasteners & Spares Included | Premium M2.5 Torx Drive Locking Screw & T8 Flag Wrench | Standard globally interchangeable micro-turning 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 - 190 m/min | 0.03 - 0.12 mm/rev |
| Alloy Steel / Tool Steel (P-Class / 4140 / SCM440) | 85 - 150 m/min | 0.03 - 0.10 mm/rev |
| Austenitic Stainless Steels (M-Class / SS304 / SS316) | 65 - 110 m/min | 0.02 - 0.08 mm/rev |
| Cast Irons / Nodular Irons (K-Class / G25 / GGG40) | 95 - 160 m/min | 0.04 - 0.14 mm/rev |
4. Product Application Scenarios
- Sub-Spindle Back-Working: Executing internal micro-turning and profiling cycles on back-working tool blocks of CNC Swiss lathes.
- Chatter-Prone Thin-Walled Boring: Turning high-precision sleeves or thin-walled aerospace tubes where standard 95° bars induce vibration.
- Micro-Cavity Step Profiling: Machining micro-hydraulic valve seats, precision instrumentation housings, and miniature bush liners with minimal tool deflection.
5. Equipment Tooling Compatibility Matrix
- CNC Swiss & Gang Lathe Toolposts: The 7mm cylindrical shank mounts into metric 7mm tool blocks or standard imperial 5/8" or 1/2" blocks using precision split reduction bushes.
- ISO CCMT Sizing-06 Inserts: Precision pocket layout is engineered to house all 80° positive rhombic turning inserts with a thickness standard of 2.38mm, designated by standard codes **CCMT 0602--** or **CCGT 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, continuous dry boring of carbon steel and alloy liners. Highly resistant to crater wear under intense friction. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Outstanding edge sharpness and toughness. The definitive choice for stainless steels (SS304/SS316) and heat-resistant superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Completely eliminates Built-Up Edge (BUE). Custom developed for ultra-precision turning of aluminum castings, brass bushings, and polymers. |
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 M. — United States
"Finding a quality 7mm left-hand bar for our Swiss sub-spindle was tough until we found this BEYOND tool. The 75-degree lead angle completely eliminated the chatter we used to get with our standard 95-degree setups. Excellent surface finish on brass sleeves."
Klaus M. — Germany
"Hervorragende Steifigkeit. The 7mm diameter provides a perfect sweet spot for micro-boring where 6mm is too flexible and 8mm doesn't clear the entry hole. Hardened alloy steel absorbs dynamic harmonics beautifully."
Takashi I. — Japan
"Perfect for reverse spindle lines. The central screw clamping is very clean and leaves the tool head completely unobstructed. Swarf clears easily out of 10mm blind bores. Highly recommended for precise production runs."
Giovanni F. — Italy
"Very durable black oxide coating. Holds up perfectly against continuous high-pressure coolant. Machining stainless steel internal cavities with precise tolerances has become much more stable."
Dave L. — Canada
"The pocket tolerance is dead-on. Mount a CCGT polished insert, and it sits perfectly flush with no rotational play. T8 flag wrench and M2.5 fasteners supplied are heavy duty. Will definitely reorder."
8. AI-Style Engineering Support Engine (FAQ)
Q1: Why choose a 75° SCKCL holder over a standard 95° SCLCL left-hand bar for micro-boring?
A1: Choose the 75° SCKCL bar when you encounter severe harmonic chatter in deep, narrow bores. The 75-degree lead angle minimizes radial cutting forces (which cause tool deflection and chatter) and redirects them axially down the shank into the toolpost. Note that a 75° tool cannot turn strict 90-degree square shoulders; a 95° tool is required for square steps.
Q2: Can I mount 55° DCMT inserts into this S07K-SCKCL06 tool holder pocket?
A2: No. The letter 'C' in the 5th position of the nomenclature designates a strict 80-degree rhombic pocket form factor. Attempting to force a 55-degree DCMT insert into this seat creates large gaps behind the pocket walls. Under active load, the insert will shift, leading to catastrophic tool failure, cracked carbide, and scrapped workpieces.
Q3: What is the absolute minimum hole diameter required for this 7mm tool to enter safely?
A3: The absolute minimum machining bore diameter (φ Dmin) is 9.5mm to 10.0mm. Although the solid structural steel shank is 7mm, the offset tool head must include sufficient clearance mass to support the pocket wall and the thickness of the mounted CCMT 0602 carbide insert. Attempting to operate in holes under 9.5mm will cause the tool flank to rub heavily against the internal wall.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable globally with standard international metric S07K-SCKCL06 precision left-hand internal boring bars. For standard American imperial lathe turrets, the 7mm cylindrical steel shank drops smoothly into standard 5/16-inch boring sleeves or blocks using precision split reduction sleeves, pairing exactly with standard ANSI indexable positive insert designations CCMT 21.50.5, CCMT 21.51, or CCGT 21.51.
Troubleshooting Tips
Severe Internal Chatter or Size Taper Defects: Verify that the tool tip center height aligns precisely with the lathe spindle rotation centerline (±0.01mm). An off-center tool alters the effective relief clearance, provoking rapid tool nose chipping or harsh rubbing lines along the cavity wall.
Precision Screw Jamming or Thread Stripping: Fine turning swarf generates highly localized frictional heat. Blow out fine micro-dust from the pocket seat before indexing inserts, and periodically apply anti-seize lubricant to the M2.5 screw threads to avoid terminal binding.
Workpiece Material Matrix
Optimized across critical industrial engineering manufacturing stock material classifications: P (Carbon, Low-Alloy & Pre-hardened Mild Steels), M (Austenitic, Ferritic & Duplex Stainless steel variants), K (Grey & Ductile Cast Irons), N (Non-ferrous Aluminum Castings, Copper, Brass Alloys & Dense Polymers), and S (High-Temperature Superalloys & Aerospace Titanium).
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.