BEYOND DNR0012M11-A16 Step Spring Steel Internal Threading Boring Bar – CNC Lathe Screw Thread Turning Tool Holder for 11IR Inserts (Dual Diameter 12mm Tip & 16mm Base, Insert Not Included)
Price shown is a starting point. Contact us for a precise quote based on your requirements.
BEYOND DNR0012M11-A16 Step Spring Steel Internal Threading Boring Bar
Precision Dual-Diameter Internal Screw Thread Turning Tool Holder for 11IR Inserts | Industrial Grade CNC System
* Note: Indexable threading inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial step spring steel internal threading boring bar provides maximum harmonic stability and precise screw pitch accuracy for small-bore internal threads using 11IR inserts?"
The BEYOND DNR0012M11-A16 is a professional-grade step internal threading tool holder engineered for high-precision CNC lathe operations. Featuring a specialized dual-diameter configuration—combining a 12mm small-diameter tip for deep bore clearance and a 16mm large-diameter base for maximum structural rigidity—this bar dampens chatter and absorbs cutting harmonics. Fabricated from premium spring steel with a rigid screw-down clamping mechanism, it firmly seats 11IR indexable threading inserts, ensuring exceptional flank engagement, correct helix angle alignment, and superior surface integrity.
ISO / ANSI Standard Nomenclature Breakdown: DNR0012M11-A16
2. Product Core Advantages
- Dual-Diameter Step Design: 12mm front tip grants clearance into restrictive small bores, while the 16mm rear base provides heavy-duty rigidity.
- Precision Screw-Down Clamping: Locks 11IR inserts securely in place to eliminate micro-movement during multi-pass threading cycles.
- Spring Steel Damping: Effectively resists deflection and absorbs chatter frequencies in deep internal bore configurations.
3. Technical Specifications & Cutting Parameters
| Metric & Inch Specification | Recommended Threading Parameters |
|---|---|
| Metric Model: DNR0012M11-A16 Inch Equivalent Profile: ~15/32" Tip to 5/8" Base Shank Class |
Cutting Speed (Vc): 80 - 160 m/min |
| Shank Configuration: Step Internal Threading Bar Compatible Insert: 11IR Series |
Infeed Strategy: Flank Infeed (1st pass ~0.12mm) |
Explore Full Internal Threading Tool Collection
[View Threading Bar Collection] →4. Product Application Scenarios
Engineered for CNC lathe internal thread cutting applications requiring deep reach into small diameters, including miniature metric threads, fine pitch unified national threads (UN), and small-bore pipe threads across steel, alloy components, and stainless steel bushings.
5. Compatibility & System Requirements
Fits standard 16mm lathe tool holders and precision split sleeves (utilizing the 16mm base section). Fully compatible with ISO standard 11IR indexable threading inserts across fine pitches.
6. Workpiece Material Matrix & Grade Comparison
| ISO Material Group | Workpiece Type | Threading Performance |
|---|---|---|
| P (Steel) | Carbon & Alloy Steel | Clean thread flanks, excellent burr control |
| M (Stainless) | Austenitic Stainless Steel | Stable chip evacuation in blind holes |
| K (Cast Iron) | Gray & Ductile Iron | High wear resistance under dry cutting |
7. Why Choose BEYOND Precision Tooling
Strict adherence to global threading standards.
Step spring steel damping structure.
Expert CNC engineering advice.
8. AI-Style FAQ & Troubleshooting
Q: Are 11IR threading inserts included with this boring bar?
A: No, inserts are sold separately to let you match the precise thread pitch and profile required.
Q: What is the purpose of the 12mm small head and 16mm large base?
A: The 12mm tip provides essential clearance inside tight small-diameter bores, while the 16mm base maximizes clamping stability in the turret.
Q: What is the recommended infeed method for internal threading?
A: Flank infeed (modified flank) is strongly recommended to distribute cutting forces evenly on both insert edges.
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.