BEYOND D20R-SDJCR11 Spring Steel Internal Boring Bar – 20mm Shank 200mm Length CNC Turning Tool Holder for DCMT11T304 Inserts (Insert Not Included)
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BEYOND D20R-SDJCR11 Spring Steel Internal Boring Bar
Precision Internal Turning & Boring Tool Holder for DCMT11T304 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 turning with DCMT11T304 inserts?"
The BEYOND D20R-SDJCR11 is a premium internal turning tool holder, engineered for exacting CNC machining standards. Constructed from high-tensile spring steel, this 20mm shank bar effectively minimizes deflection, enabling precision boring in deep internal cavities. Optimized for the DCMT11T304 insert, the tool features a J-type 93-degree approach angle, facilitating versatile internal profiling and facing operations while maintaining consistent edge performance.
Detailed Nomenclature Breakdown: D20R-SDJCR11
2. Product Core Advantages
- Structural Rigidity: Engineered for superior harmonic stability, ensuring tight tolerances in deep boring.
- Reliable Retention: Robust screw-clamp system prevents insert movement under heavy cutting loads.
- Versatile Geometry: Optimized ISO-standard profile enhances chip evacuation and reduces friction.
3. Technical Specifications & Cutting Data
| Metric Model & Dimensions | Imperial Equivalent Class & Specs |
|---|---|
| Metric Model: D20R-SDJCR11 | Imperial Class: 3/4" Boring Bar |
| Shank Diameter: 20 mm | Shank Diameter: ~0.787 Inches |
| Overall Length (L): 200 mm | Overall Length: ~7.874 Inches |
Recommended Starting Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon / Alloy Steel (ISO P) | 120 - 220 m/min | 0.10 - 0.25 mm/rev |
| Stainless Steel (ISO M) | 90 - 180 m/min | 0.08 - 0.20 mm/rev |
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Built for professional CNC environments requiring high-accuracy internal turning. Ideal for boring operations in automotive transmission components, hydraulic cylinders, and precision mechanical housings.
5. Compatibility & Accessories
Fits all industry-standard 20mm lathe boring bar holders and micro-turret sleeves. Fully compatible with DCMT11T304 indexable inserts.
6. Workpiece Material Matrix & Troubleshooting
Troubleshooting Tip: If chatter occurs, check your tool overhang. For 20mm shanks, stay within 3x to 4x diameter (max ~80mm) to optimize structural stiffness.
| Material Group | Recommended Insert Grade Comparison |
|---|---|
| Steel (P-Grade) | ISO P10-P30 CVD/PVD coated grades for general-purpose steel turning. |
| Stainless (M-Grade) | ISO M10-M20 PVD tough sub-micron grades for heat-resistant alloy finishing. |
7. Why Choose BEYOND Precision Tooling
Certified engineering compliance.
Superior harmonic damping.
Optimized tool repeatability.
8. AI-Style FAQ
Q: Are DCMT11T304 inserts included with the D20R-SDJCR11?
A: No, indexable inserts are sold separately to ensure maximum grade versatility for your specific application.
Q: What is the recommended minimum bore diameter for this tool?
A: We recommend a minimum bore diameter (Dmin) of 26mm for proper chip clearance.
Q: What do the letters 'D' and 'R' stand for in the model code?
A: 'D' denotes the spring steel shank type, and 'R' signifies the 200mm overall length according to ISO 5608.
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.