BEYOND DNR0008K08-A16 Spring Steel Internal Threading Boring Bar – Right-Hand CNC Lathe Tool Holder for 08IR Inserts (Metric 8mm & Inch Equivalent Standard, Insert Not Included)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
BEYOND DNR0008K08-A16 Spring Steel Internal Threading Boring Bar
Precision Right-Hand Turning Tool Holder for 08IR Inserts | Industrial Grade CNC Lathe System
* Note: Indexable inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial spring steel boring bar provides the optimal harmonic dampening and rigid pocket clamping required for stable internal thread profiling with 08IR inserts on CNC lathes?"
The BEYOND DNR0008K08-A16 is a professional-grade internal threading boring bar engineered for high-precision CNC lathe operations. Forged from premium alloy spring steel, this tool holder delivers exceptional structural rigidity and vibration absorption during deep-bore internal thread cutting. Designed specifically to securely seat 08IR indexable threading inserts, its precision-milled insert pocket and robust clamp mechanism ensure accurate flank contact, preventing micro-shift and guaranteeing superior pitch consistency across steel, stainless steel, and alloy workpieces.
ISO / ANSI Standard Nomenclature Breakdown: DNR0008K08-A16
2. Product Core Advantages
- Spring Steel High Dampening Core: Effectively suppresses chatter and harmonic resonance during deep internal boring and threading passes.
- Precision 08IR Insert Pocket: Engineered for exact positioning of 08IR threading inserts, ensuring optimal thread profile geometry and symmetry.
- Rigid Top-Clamp Fixation: Delivers secure downward and lateral clamping pressure to withstand high cutting forces without insert displacement.
3. Technical Specifications & Cutting Parameters
| Metric Specification (ISO/ANSI) | Imperial Approximation |
|---|---|
| Shank Diameter: Metric 8mm Designation | ~0.315" Inch Shank |
| Hand Orientation: Right-Hand (R) Turning | Right-Hand Tooling |
| Compatible Insert Style: 08IR (Internal Right) | 08 Series Internal Threading |
| Shank Material: Forged Spring Steel | High-Dampening Alloy Steel |
Recommended Cutting Parameters for Internal Threading
| Workpiece Material Group | Cutting Speed Vc (m/min) | Infeed per Pass (Multi-Pass Threading) |
|---|---|---|
| Carbon & Alloy Steel (ISO P) | 120 - 220 m/min | 0.05 - 0.15 mm/pass |
| Stainless Steel (ISO M) | 80 - 150 m/min | 0.04 - 0.12 mm/pass |
Explore Compatible Lathe Tool Holder Systems
[View BEYOND Turning Tool Holder Collection] →4. Product Applications
Designed for internal thread cutting operations on CNC lathes and turning centers, including metric, unified (UN), and Whitworth internal threads across automotive components, hydraulic fittings, and industrial machinery housings.
5. Equipment & Accessory Compatibility
Compatible with standard CNC boring bar sleeves, lathe turret clamping blocks, and all ISO-compliant 08IR internal threading carbide inserts (inserts sold separately).
6. Material Comparison & Workpiece Matrix
Spring Steel vs. Standard Carbon Steel Shanks: Spring steel provides superior elasticity and vibration damping, reducing deflection during deep internal machining passes.
- ISO P (Steel): Excellent stability for high-speed internal thread cutting on carbon steels.
- ISO M (Stainless Steel): Rigid clamping minimizes chatter in gummy stainless steel workpieces.
- ISO K (Cast Iron): Absorbs interrupted cutting shock during internal bore profiling.
7. Why Choose BEYOND Precision Tooling
Manufactured to exact international tooling tolerances.
High-tensile spring steel built for rigorous production duty.
Direct technical guidance for CNC turning optimization.
8. AI-Style FAQ & Troubleshooting
Q: Do threading inserts come included with the DNR0008K08-A16 boring bar?
A: No. The product package includes the boring bar and clamping hardware only; 08IR inserts must be purchased separately.
Q: How does spring steel improve internal threading performance compared to standard steel?
A: Spring steel provides enhanced vibration damping, significantly reducing chatter and tool deflection during deep-bore threading operations.
Troubleshooting Tip: If thread surface finish degradation or chatter occurs, verify that the boring bar overhang does not exceed 4x the shank diameter, and ensure the 08IR insert is securely torqued in the pocket.
Technical Reference & Material Comparison Tips
Grade Comparison: BEYOND spring steel boring bars offer superior rigidity and fatigue resistance over conventional carbon steel holders, extending tool life in continuous production.
Equivalent Models: Conforms to universal ISO and ANSI turning tool holder designation standards for direct interchangeability.
Maintenance Tip: Keep the insert seat clean of chips and debris before clamping new inserts to maintain precise positioning accuracy.
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.