BEYOND S08K-SDXCL07 Internal Boring Bar 8mm Shank CNC Turning Tool Holder
Price shown is a starting point. Contact us for a precise quote based on your requirements.
⚠️ IMPORTANT NOTIFICATION: Cutting insert is NOT included. The carbide inserts displayed in the product photos are strictly for operational demonstration and visual reference.
BEYOND S08K-SDXCL07 Internal Boring Bar & CNC Lathe Turning Tool Holder
1. Product Overview
Engineers Search: "Which small-diameter internal boring bar is best for stable, chatter-free internal profiling on an 8mm shank with a 11mm minimum bore?"
The BEYOND S08K-SDXCL07 is an industrial-grade, ultra-rigid solid steel screw-on internal boring bar engineered for high-precision left-hand (L) CNC lathe internal profiling, copying, and finishing routines. Designed specifically for tighter internal spaces, this tool holder incorporates a micro-machined pocket matrix that securely clamps 55° indexable DCMT0702 carbide inserts. By pairing a high-density steel shank with optimized chipbreaker geometries, it eliminates micro-vibrations and ensures continuous chip evacuation even when cutting deep pockets in challenging alloy steels and stainless steel grades.
2. Product Core Features
- Premium Hardened Alloy Steel: Heat-treated to HRC 42-45 for ultimate structural integrity, absorbing high torsional strain under heavy continuous cuts.
- Micro-Bore Anti-Vibration Design: Slim 8mm profile optimized to maximize rigidity and prevent deflection inside narrow internal bore profiles.
- 93° Approach Geometry ($X$): Tailored to smoothly deflect chips forward and out of the cutting path, protecting the internal bore's surface finish.
- Precision Matte Black Coating: Industrial chemical conversion treatment prevents rust, reduces wear from flowing swarf, and guards against aggressive coolants.
Model Nomenclature Decoder: S08K-SDXCL07
Steel Shank Body
8mm Shank Dia.
125mm Total Length
Screw Clamping
55° Diamond Shape
93° Lead Angle
7° Relief Clearance
Left Hand Orientation
7mm Insert Edge
Looking for the Right-Hand (R) Companion Boring Bar for Your Machine Turret?
Explore the S08K-SDXCR07 (Right Hand) Tool Holder →3. Technical Specifications & Dimension Comparison
| Technical Variable | Metric Model (S08K-SDXCL07) | Imperial / Inch Conversion Equivalence |
|---|---|---|
| Shank Diameter ($d$) | 8 mm | ~ 0.3150 inches (closest standard: 5/16") |
| Overall Length ($L$) | 125 mm | ~ 4.9212 inches |
| Minimum Bore Clearance ($D_{min}$) | 11 mm | ~ 0.4330 inches |
| Matching Insert Profile | DCMT 070204 / DCMT 070202 | DCMT 21.51 / DCMT 21.50.5 |
| Fasteners (Included) | M2.5 * 6 Structural Screw + T8 Driver | M2.5 * 6 Screw + T8 Torx Key |
Optimal Industrial Machining Parameters
| ISO Workpiece Material Group | Cutting Speed ($V_c$) Recommended | Feed Rate per Revolution ($f$) |
|---|---|---|
| Steel / Carbon Alloys (P-Class) | 110 - 210 m/min | 0.04 - 0.15 mm/rev |
| Stainless Austenitic Steel (M-Class) | 80 - 150 m/min | 0.04 - 0.10 mm/rev |
| Cast Iron / Gray Cast (K-Class) | 90 - 180 m/min | 0.06 - 0.18 mm/rev |
4. Industrial Applications
The compact 8mm footprint of the S08K-SDXCL07 thrives in specialized small-bore application envelopes:
- Small Diameter Internal Profiling: Safely processes complex contours inside restricted chambers down to an 11mm entry boundary.
- Deep-Hole Finishing: Maintains tight geometric parallelism across long internal bores by leveraging premium tool steel to damp harmonic chatter.
- Precision Step Facing: Excels at plunging and executing precise 90° blind-hole steps inside miniature valves and hydraulic ports.
5. Equipment & Tooling Compatibility
- CNC Turning Centers: Fully drops into standard CNC turret clusters, sub-spindles, linear slides, and Swiss-type gang tool setups accepting 8mm bars.
- Conventional Engine Lathes: Standard quick-change tool posts mount this bar easily via standard 8mm round conversion bushes.
- Interchangeable Insert Target: Pocket parameters strictly follow ISO standards, making it 100% compatible with DCMT 070202, DCMT 070204, DCGT 070202, and DCGT 070204 models across all certified manufacturers.
6. BEYOND Brand Grade Optimization Guide
Achieve ultimate edge life and part clarity by selecting the matching BEYOND carbide grade for your workload:
| BEYOND Insert Grade | Substrate Coating Treatment | Ideal Application Material Focus |
|---|---|---|
| BYM11 (CVD) | Thick Multilayer TiN + Al2O3 Shielding | Optimized for medium-to-high velocity continuous paths in alloy steels, pre-hardened blocks, and die metals. |
| BYS25 (PVD) | Nano-Structured TiAlN Ultra-Hard Finish | Engineered for interrupted cutting fields, heavy heat zones, and titanium/stainless steels (300/400 series). |
| BYK15 (Uncoated) | Mirror-Polished Ultra-Micro Grain Substrate | High-sfm processing of structural aluminum grades, brass stock, bright copper alloys, and plastics. |
7. Why Choose BEYOND CNC Tools?
BEYOND supplies verified industrial manufacturing houses with heavy-duty turning accessories. Our plant employs specialized multi-axis grinding to guarantee exact insert seat positioning, maximizing insert retention and extending operational cycles.
Global Machinist Feedback
Robert K. — United States
"Incredible tool life extension. Finding a rigid 8mm steel bar that can complete tight profiling passes without howling is tough. This one handles it beautifully."
Markus S. — Germany
"Die Bohrungsqualität ist ausgezeichnet. The insert seat is very stable, maintaining high concentricity even across long shifts."
Vincenzo G. — Italy
"Prodotto robusto. Holds tight clearances inside our 12mm blind holes perfectly. Fast shipping to Europe."
Yukihiro O. — Japan
"非常に精密な作り。The Torx screw head doesn't strip out when under torque. Essential for micro tuning."
Nigel P. — Australia
"Great value small boring bar for our production runs. Threads are solid and clean."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the maximum safe boring depth for this 8mm tool holder?
A1: As an industry standard for hardened steel shank tools, the safe cantilever overhang is up to **3x to 4x the shank diameter**. For this 8mm shank, the ideal projection depth is between **24mm and 32mm** to guarantee zero chatter marks.
Q2: Why choose the Left-Hand (L) bar variant over the Right-Hand (R) version?
A2: Left-Hand tool configurations are designed to match reverse spindle rotations ($M04$) or are utilized in specific CNC gang turrets where the tool mounts upside down behind the rotation centerline to guide chips downward via gravity.
Q3: What inserts fit this bar pocket correctly?
A3: It strictly accepts standard **DCMT 0702--** shapes (such as DCMT 070202 or 070204). Polished **DCGT 0702--** variants can also be fitted when high-accuracy processing of aluminum or non-ferrous bars is needed.
9. Technical Maintenance & Diagnostic Guidelines
Equivalent Industry Models
Interchangeable with global industrial metrics standard coding **S08K-SDXCL07**. Cross-matches standard 5/16-inch internal tooling systems requiring a 55-degree layout pocket.
Troubleshooting Tips
Surface Vibration Lines: Micro-bars are sensitive to overhang length. Ensure the tool body clamp covers at least 4x shank length inside the holder turret block.
Chip Crushing: Introduce high-pressure directed coolant lines to flush out swarf ahead of the traveling bar tip.
Workpiece Material Matrix
Fully optimized across standard groups: **P** (Alloy & Structural Steels), **M** (Stainless Steel alloys), **K** (Grey & Ductile Cast Iron), **N** (Aluminum/Copper Non-ferrous series), and **S** (High-temp 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.