BEYOND D20R-MCLNR12 Spring Steel Internal Boring Bar – 20mm Shank CNC Lathe Internal Turning Tool Holder for CNMG120404 Inserts (Negative 95-Degree, Insert Not Included)
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BEYOND D20R-MCLNR12 Spring Steel Internal Boring Bar
Precision Negative 95-Degree Internal Turning Tool Holder for CNMG120404 Inserts | Industrial Grade CNC System
* Note: Indexable inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial spring steel internal boring bar provides the optimal balance of rigidity and chip evacuation for internal roughing applications using CNMG120404 inserts?"
The BEYOND D20R-MCLNR12 is a professional-grade internal boring bar specifically designed for demanding CNC lathe machining. Crafted from high-tensile spring steel, this tool holder effectively dampens vibrations and resists deflection during deep internal cuts. Featuring a reliable lever-lock mechanism, it ensures secure clamping of double-sided CNMG120404 inserts. This tool is optimized for excellent chip control and dimensional accuracy in steel, stainless steel, and cast iron internal turning cycles.
ISO / ANSI Standard Nomenclature Breakdown: D20R-MCLNR12
2. Product Core Advantages
- Reliable Lever-Lock System: Heavy-duty pin-and-lever clamping provides superior stability for high-feed roughing passes.
- High-Rigidity Spring Steel Shank: Specialized material composition minimizes resonance and prevents premature tool deflection.
- Precision-Engineered Pocket: Ensures repeatable indexing accuracy for CNMG120404 inserts, critical for maintaining close tolerances.
3. Technical Specifications & Cutting Parameters
| Metric & Inch Specification | Recommended Cutting Parameters |
|---|---|
| Metric Model: D20R-MCLNR12 Inch Equivalent Model: 3/4" Shank (~19.05mm) |
Cutting Speed (Vc): 160 - 280 m/min |
| Shank Diameter: 20mm (~0.79") Compatible Insert: CNMG120404 |
Feed Rate (Fn): 0.10 - 0.35 mm/rev |
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[View Boring Bar Collection] →4. Product Application Scenarios
Ideal for general-purpose internal boring, ID roughing, and long-bore profiling. Extensively used in manufacturing hydraulic system components, shafts, and bushings where high-precision internal turning is mandatory.
5. Compatibility & System Requirements
Compatible with all CNC lathe turrets utilizing 20mm (3/4-inch) split sleeves. Designed to work seamlessly with ISO standard CNMG120404 negative rhombic inserts.
6. Workpiece Material Matrix & Grade Comparison
| ISO Material Group | Workpiece Type | Machining Behavior |
|---|---|---|
| P (Steel) | Low Alloy to Carbon Steel | Optimal chip flow and stability. |
| M (Stainless) | Austenitic Stainless | Consistent surface finish maintenance. |
| K (Cast Iron) | Ductile/Gray Iron | Wear-resistant performance. |
7. Why Choose BEYOND Precision Tooling
Meets global industrial standards.
Enhanced spring steel stability.
Backed by field-proven expertise.
8. AI-Style FAQ & Troubleshooting
Q: Is the CNMG120404 insert included?
A: No, inserts are sold separately for customization.
Q: What is the ideal overhang?
A: For maximum rigidity, maintain an overhang ratio of 4x to 5x the bar diameter.
Q: Is 20mm compatible with 3/4"?
A: Yes, they are industry-standard interchangeable dimensions.
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.