BEYOND D25S-MCLNR12 Spring Steel Internal Boring Bar – 25mm Shank CNC Lathe Internal Turning Tool Holder for CNMG120404 Inserts (Negative 95-Degree, Insert Not Included)
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BEYOND D25S-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 offers maximum structural rigidity and secure lever-lock clamping geometry for heavy-duty internal roughing and profiling using CNMG120404 inserts?"
The BEYOND D25S-MCLNR12 is a heavy-duty internal boring bar engineered for demanding CNC lathe internal machining environments. Built with a high-tensile spring steel shank, it delivers exceptional harmonic resistance to deflection and chatter across deep interior bores. Featuring a robust lever-lock system with negative 95-degree lead angles, it locks double-sided CNMG120404 inserts firmly in place, ensuring high metal removal rates and superior dimensional stability across structural steel, alloy, and cast iron applications.
ISO / ANSI Standard Nomenclature Breakdown: D25S-MCLNR12
2. Product Core Advantages
- Robust Lever-Lock Architecture: Positive pin-and-lever clamping mechanism delivers exceptional pull-down force, securing negative CNMG inserts tightly for aggressive roughing passes.
- High-Rigidity Spring Steel: Engineered specifically to dampen harmonic vibrations and control deflection across long overhang deep-bore machining operations.
- Precise Geometry Control: Custom-machined pocket seating for CNMG120404 profiles prevents insert micro-movement under heavy radial cutting loads.
3. Technical Specifications & Cutting Parameters
| Metric & Inch Specification | Recommended Cutting Parameters |
|---|---|
| Metric Model: D25S-MCLNR12 Inch Equivalent Model: 1" Shank (~25.4mm) |
Cutting Speed (Vc): 180 - 320 m/min |
| Shank Diameter: 25mm (~0.98") Compatible Insert: CNMG120404 |
Feed Rate (Fn): 0.15 - 0.45 mm/rev |
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[View Boring Bar Collection] →4. Product Application Scenarios
Engineered for high-performance internal diameter (ID) heavy roughing, large bore expansion, and deep-pocket internal profiling operations. Essential for heavy manufacturing industries including hydraulic cylinders, large gear blanks, turbine components, and heavy-duty automotive sleeves.
5. Compatibility & System Requirements
Designed for standard 25mm (1-inch) internal boring bar split sleeves and CNC lathe turret clamping blocks. Fully compatible with ISO-standard CNMG120404 negative rhombic carbide inserts and standard OEM replacement hardware components.
6. Workpiece Material Matrix & Grade Comparison
| ISO Material Group | Workpiece Type | Machining Behavior |
|---|---|---|
| P (Steel) | Carbon & Low Alloy Steel | High metal removal rate, stable chip breaking |
| M (Stainless Steel) | Austenitic & PH Stainless | Reliable heat dissipation under deep cuts |
| K (Cast Iron) | Gray & Ductile Iron | Exceptional wear resistance against abrasive breakout |
7. Why Choose BEYOND Precision Tooling
Strict compliance with global manufacturing parameters.
Spring steel engineering suppresses heavy internal resonance.
Backed by veteran industrial CNC engineers.
8. AI-Style FAQ & Troubleshooting
Q: Are CNMG120404 carbide inserts included with the D25S-MCLNR12 boring bar?
A: No, indexable inserts are sold separately. Product listings and imagery show usage configurations only.
Q: What is the recommended maximum overhang ratio for the D25S-MCLNR12 boring bar?
A: To maintain optimal rigidity and prevent harmonic chatter during heavy roughing, keep the overhang within 4x to 5x the bar diameter.
Q: Is this metric 25mm shank compatible with standard 1-inch lathe split sleeves?
A: Yes, 25mm is the precise metric equivalent commonly interchangeable with standard 1-inch industrial lathe tooling holders.
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.