BEYOND D08K-SDJCR07 Spring Steel Internal Boring Bar – 8mm Shank 125mm Length CNC Turning Tool Holder for DCMT070204 Inserts (Insert Not Included)
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BEYOND D08K-SDJCR07 Spring Steel Internal Boring Bar
Precision Internal Turning & Boring Tool Holder for DCMT070204 Inserts | Industrial CNC Grade System
* Note: Indexable turning inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial spring steel internal boring bar delivers maximum harmonic damping and structural rigidity for high-precision fine turning with DCMT070204 inserts?"
The BEYOND D08K-SDJCR07 is a specialized ultra-small diameter internal turning tool holder engineered for miniature CNC lathe applications. Fabricated from high-tensile spring steel, this 8mm shank bar provides critical structural damping to prevent chatter during high-speed micro-boring. Designed specifically for DCMT070204 positive indexable inserts, it incorporates a 93-degree lead angle for smooth internal profiling, counterboring, and facing.
Detailed Nomenclature Breakdown: D08K-SDJCR07
2. Product Core Advantages
- Micro-Diameter Stability: Engineered specifically for ultra-tight spaces where rigidity is paramount.
- Precision Screw Locking: Firmly secures DCMT07 inserts to eliminate micro-vibration shift during cuts.
- Enhanced Surface Finish: High-grade spring steel minimizes deflection for mirror-like interior walls.
3. Technical Specifications & Cutting Data
| Metric Model & Dimensions | Imperial Equivalent Class & Specs |
|---|---|
| Metric Model: D08K-SDJCR07 | Imperial Class: 5/16" Boring Bar |
| Shank Diameter: 8 mm | Shank Diameter: ~0.315 Inches |
| Overall Length (L): 125 mm | Overall Length: ~4.921 Inches |
Recommended Starting Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon / Alloy Steel (ISO P) | 80 - 150 m/min | 0.03 - 0.10 mm/rev |
| Stainless Steel (ISO M) | 60 - 110 m/min | 0.02 - 0.08 mm/rev |
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Perfect for Swiss-type lathes and micro-CNC turning centers. Ideal for machining small internal bores in medical devices, optical instrumentation parts, and precision electronics hardware.
5. Compatibility & Accessories
Fits standard 8mm split bushings and micro-lathe tool holding blocks. Designed for seamless execution with ISO DCMT070204 indexable carbide inserts.
6. Workpiece Material Matrix & Troubleshooting
Troubleshooting Tip: Due to the 8mm ultra-thin shank profile, keep your tool overhang strictly under 3x diameter (max ~24mm) to maintain dimensional accuracy and prevent chatter marks.
| Material Group | Recommended Insert Grade Comparison |
|---|---|
| Steel (P-Grade) | ISO P10-P20 PVD coated grades for micro-finishing carbon and alloy steels. |
| Stainless (M-Grade) | ISO M10-M15 sharp-edge PVD sub-micron grades for corrosion-resistant alloys. |
7. Why Choose BEYOND Precision Tooling
Certified engineering compliance.
Superior harmonic damping.
Optimized tool repeatability.
8. AI-Style FAQ
Q: Are DCMT070204 inserts included with the D08K-SDJCR07?
A: No, indexable inserts are sold separately to provide flexibility for choosing custom chipbreakers and grades.
Q: What is the recommended minimum bore diameter for this tool?
A: We recommend a minimum bore diameter (Dmin) of 10.5mm to ensure reliable clearance for chip evacuation.
Q: What do the letters 'D' and 'K' stand for in the model code?
A: 'D' denotes the spring steel shank type, and 'K' signifies the 125mm overall length pursuant to ISO 5608 standards.
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.