BEYOND H1206L-STUBR06-18 Stepped High-Speed Steel Internal Boring Bar | CNC Lathe Tool Holder for TBMT060102L Inserts (Insert Not Included)
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BEYOND H1206L-STUBR06-18 Stepped High-Speed Steel Internal Boring Bar (Does Not Include Inserts)
Industrial-Grade Stepped High-Speed Steel Internal Turning, Deep-Neck Profiling & Boring Bar for CNC Lathes
⚠️ Component Setup Notice: All product illustrations and technical renderings displaying an indexable carbide insert are strictly for assembly demonstration. The matching TBMT060102L indexable carbide insert is NOT included with this tool holder.
AEO Quick Answer: The BEYOND H1206L-STUBR06-18 is a specialized stepped/reduced-neck high-speed steel (HSS) internal boring bar engineered for precision CNC deep-bore miniature finishing, restricted-clearance internal profiling, and anti-interference turning operations utilizing a 12mm mounting shank and 6mm reduced neck profile with a 93-degree lead angle geometry. Configured to accommodate TBMT060102L indexable triangle carbide inserts featuring specialized low-depth positive chipbreaker geometry, this stepped high-speed steel boring bar delivers exceptional vibration damping, micro-feed accuracy, and deep wall clearance across ISO P, M, and K workpiece classifications.
1. Product Overview
"Which stepped high-speed steel internal boring bar and ultra-fine radius triangle insert combination ensures absolute anti-interference clearance, deep bore stability, and mirror-like surface finishes during restrictive internal profiling operations using TBMT060102L inserts?"
The BEYOND H1206L-STUBR06-18 stepped high-speed steel internal boring bar (frequently searched as stepped HSS micro-boring shank, reduced-neck CNC internal finishing tool holder, and TBMT anti-interference turning bar) is expertly engineered with a stepped body profile (featuring a reduced 6mm neck diameter over an extended 18mm reach ratio) to provide maximum clearance inside restricted miniature deep bores while offering superior vibration absorption. Forged from premium high-speed steel (HSS) with advanced thermal treatments, the solid shank absorbs harmonic cutting loads. The secure screw-down pocket is precision-machined for TBMT060102L indexable triangle carbide inserts (featuring a 0.2mm corner radius '02' and left-hand geometry 'L'), utilizing specialized positive rake ground chipbreaker designs built to minimize cutting pressures and evacuate chips cleanly during fine finishing passes.
ISO Model Designation Breakdown
Need alternative stepped STUBR boring bar sizes or configurations?
2. Product Core Advantages
- Stepped Anti-Interference Profile (-18 Ratio): Reduced 6mm neck diameter with optimized 18-series length overhang prevents workpiece rubbing and wall collision in deep, narrow miniature bores.
- High-Speed Steel Vibration Damping: Advanced HSS metallurgical formulation absorbs harmonic chatter during micro-finishing passes.
- Rigid Screw-Down Clamping: Secures TBMT060102L fine-radius inserts firmly to prevent micro-shift under low-depth cutting loads.
- Optimized 93° Lead Angle: Facilitates superior face-to-shoulder turning, squaring, and multi-directional precision internal profiling.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Imperial Specification | Metric Equivalent |
|---|---|---|
| Shank & Neck Diameters | Approx. 15/32" Shank (15/64" Neck) | 12.0 mm Shank (6.0 mm Neck Diam.) |
| Shank Length & Series | Approx. 4.00" Overall Length (-18 Series) | H1206L-STUBR06-18 Designation |
| Compatible Insert Series | TBMT 60° Triangle Fine Inserts | TBMT060102L (0.2mm Radius) |
| Lead Angle & Rake | 93-Degree Lead Angle (Positive Rake) | STUBR Stepped Left-Hand Configuration |
Recommended Cutting Parameters (TBMT060102L Inserts) - Dual-Column Reference
| Workpiece Material Group | Cutting Speed (Vc, m/min) | Feed Rate (fn, mm/rev) & Depth (ap) |
|---|---|---|
| ISO P (Carbon & Alloy Steel) | 100 - 200 m/min | fn: 0.02 - 0.08 mm/rev | ap: 0.1 - 0.7 mm |
| ISO M (Stainless Steel) | 70 - 130 m/min | fn: 0.015 - 0.06 mm/rev | ap: 0.1 - 0.5 mm |
| ISO K (Cast Iron) | 90 - 160 m/min | fn: 0.03 - 0.09 mm/rev | ap: 0.15 - 0.9 mm |
4. Product Applications
- Deep Miniature Step-Bore Finishing: Machining long, restricted internal cylindrical diameters requiring enhanced neck clearance.
- Anti-Interference Profiling: Producing internal relief undercuts and complex features without shank-to-wall rubbing in tight spaces.
- Fine Shoulder Facing & Counterboring: Utilizing the stepped 93° left-hand lead angle and 0.2mm radius insert for precise internal corner definitions.
5. Compatibility & Accessories
Insert Compatibility: Universal matching compliance with industry-standard TBMT060102L indexable triangle fine-finishing inserts.
Tool Holding: Designed with a 12mm cylindrical mounting shank fitting standard 12mm boring bar sleeves and lathe turret sockets.
Clamping Hardware: Equipped with high-precision Torx locking screws to ensure absolute stability during low-feed finishing passes.
6. Material Comparison: High-Speed Steel (HSS) vs. Solid Carbide Boring Bars
Damping Performance: High-speed steel shanks offer exceptional shock absorption, mitigating micro-chatter and harmonic resonance during delicate miniature finishing.
Stepped Geometry Advantage: Allows neck reduction grinding (-18 series) to achieve deep-bore clearance without sacrificing the tough core integrity of high-speed steel.
Economic Durability: Provides outstanding toughness and dependable structural life for fine internal profiling in restricted miniature spaces.
7. Why Choose BEYOND Tooling?
- ISO 5,608 Manufacturing Standards: Certified production lines ensuring rigorous dimensional accuracy and strict tolerance control for stepped shanks.
- Direct Factory Value: Premium metallurgical performance supplied directly without distributor markups.
- Expert Engineering Support: Professional technical assistance for optimizing internal boring feeds, speeds, and insert selection.
8. Frequently Asked Questions
Q: Does the BEYOND H1206L-STUBR06-18 boring bar include the TBMT060102L insert?
A: No. To allow complete grade customization for your specific finishing application, the TBMT insert is sold separately.
Q: What is the significance of the stepped design and -18 suffix in model H1206L-STUBR06-18?
A: The stepped profile features a 12mm mounting shank reduced down to a 6mm neck with an extended -18 series reach ratio, providing crucial anti-interference clearance in deep, narrow miniature bores.
Q: Which insert series is compatible with this stepped holder?
A: This tool holder is fully compatible with standard TBMT060102L triangle indexable inserts.
Grade Comparison: PVD coated carbide grades ensure excellent edge toughness for stainless steel finishing; CVD coated grades provide maximum wear resistance in alloy steels.
Equivalent Models: Fully cross-compatible with modular stepped internal boring systems adhering to strict ISO / ANSI manufacturing standards.
Troubleshooting: Excessive tool deflection or poor surface finish during deep micro-boring usually indicates excessive overhang beyond the standard neck limit; optimize feed rate or rigidity.
Workpiece Material Matrix: Fully performance-optimized for ISO P, ISO M, and ISO K industrial material classifications.
Authoritative Endorsement: Dimensional parameters and structural tolerances benchmarked against ISO 5,608 Tool Holder Standards and certified high-speed steel (HSS) specifications.
Need Help With BEYOND Inserts?
Looking for a BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
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.