BEYOND D20R-SDWCR11 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-SDWCR11 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 heavy-duty spring steel internal boring bar delivers optimal rigidity and harmonic vibration control for deep-bore machining with DCMT11T304 inserts?"
The BEYOND D20R-SDWCR11 is a professional-grade internal turning tool holder, engineered for stability in demanding CNC lathe operations. Fabricated from high-tensile spring steel, this 20mm shank bar is specifically designed to absorb cutting harmonics, ensuring superior surface finish and dimensional accuracy in deeper bores. Optimized for the DCMT11T304 indexable insert, the tool utilizes a robust screw-clamp mechanism and an industry-standard 95-degree approach angle to facilitate efficient chip evacuation and high-precision profiling.
Detailed Nomenclature Breakdown: D20R-SDWCR11
2. Product Core Advantages
- Structural Rigidity: Premium spring steel shank construction minimizes tool deflection during heavy-duty internal turning.
- Reliable Retention: Precision-milled screw clamping ensures maximum insert stability, critical for maintaining tight tolerances.
- Optimized Geometry: 95° approach angle enables seamless transitions between longitudinal boring and shoulder facing tasks.
3. Technical Specifications & Cutting Parameters
| Metric Model & Dimensions | Imperial Equivalent Class & Specs |
|---|---|
| Metric Model: D20R-SDWCR11 | Imperial Class: 3/4" Boring Bar |
| Shank Diameter: 20 mm | Shank Diameter: ~0.787 Inches |
| Min. Bore Diameter (Dmin): 25 mm | Min. Bore Diameter: ~0.984 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) | 80 - 160 m/min | 0.08 - 0.20 mm/rev |
| Stainless Steel (ISO M) | 60 - 120 m/min | 0.05 - 0.15 mm/rev |
Browse Related Internal Boring Bars
[View Boring Bar Series] →4. Product Application Scenarios
Engineered for medium-to-heavy internal boring, profiling, and complex internal turning tasks in bores 25mm and larger. Extensively used in automotive component manufacturing, hydraulic valve production, and industrial gear housing fabrication.
5. Compatibility & Tooling Accessories
Fits standard 20mm CNC lathe boring bar holders, turret blocks, and precision reduction bushings. Fully compatible with industry-standard DCMT11T304 indexable carbide turning inserts.
6. Workpiece Material Matrix & Troubleshooting
Troubleshooting Tip: For deep-bore applications, manage tool stick-out to balance rigidity; exceeding 4x the shank diameter (~80mm) significantly increases the risk of harmonic vibration and surface chatter.
| Material Group | Recommended Insert Geometry & Grade Comparison |
|---|---|
| Steel (P-Grade) | Multi-layer CVD/PVD coated grades (ISO P20-P35 equivalent) for sustained, high-speed turning. |
| Stainless (M-Grade) | Tough sub-micron substrates (ISO M15-M25 equivalent) designed for thermal stability in internal work. |
7. Why Choose BEYOND Precision Tooling
Certified manufacturing precision.
Superior harmonic damping.
Standardized industrial geometry.
8. AI-Style FAQ
Q: Are DCMT11T304 inserts included with the D20R-SDWCR11 boring bar?
A: No, indexable inserts are sold separately to ensure you can select the optimal carbide grade and chipbreaker for your workpiece material.
Q: What is the minimum bore diameter required for this 20mm bar?
A: We recommend a minimum bore diameter (Dmin) of 25mm to provide sufficient clearance and facilitate efficient chip removal.
Q: What do the letters 'D' and 'R' represent in the ISO product code?
A: 'D' signifies the spring steel material class, and 'R' designates the 200mm overall length.
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.