BEYOND T2139-C20-10R-300-1T Round Insert Button End Mill (C20-10R-300 / C0.75-R0.39-11.81-1T)
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1. Product Overview
Which indexable end mill cutter is best designed for high-feed roughing and deep cavity profiling on alloy and carbon steels? The BEYOND T2139-C20-10R-300-1T is precision-engineered for this exact industrial requirement. Fully compliant with ISO and ANSI international standards for indexable cutting tools, this tool combines a high-rigidity alloy steel substrate with a specialized positive rake angle geometry. The advanced chip breaker configuration is optimized to minimize cutting friction, lower thermal distortion, and promote seamless chip evacuation during intensive multi-axis CNC machining tasks.
2. Product Core Advantages (Key Features)
Superior Chatter Suppression
Forged from premium alloy steel and thermally refined to maximize structural core toughness, absorbing harmonic chatter under heavy axial loads.
Precision Ground Pockets
Rigid insert seat positioning guarantees high clamping repeatability, reducing runout to ensure exceptional workpiece surface finishes.
ISO / ANSI Nomenclature Breakdown: T2139-C20-10R-300-1T
Decoding every element of the standardized tool designation:
Tool Series
Shank Ø20mm
Insert Size
Length Index
Single Flute
3. Technical Specifications
Designed to integrate smoothly into global workshop environments with dual metric and imperial specifications:
| Metric Specifications (T2139-C20-10R-300-1T) | Imperial Equivalent Specifications (T2139-0.787-10R-11.81-1T) |
|---|---|
| Shank Diameter: 20 mm (C20) | Shank Diameter: 0.7874 inches |
| Overall Length: 300 mm | Overall Length: 11.811 inches |
| Cutting Diameter: Indexable Standard Range | Cutting Diameter: Fraction Scale Equivalent |
| Number of Flutes: 1T (Single Insert) | Flute Count: 1 Flute Configuration |
| Tool Standard: ISO 5608 / ISO 9001 | ANSI / ASME Industrial Equivalent Standard |
Recommended Cutting Parameters (Feed & Speed Guidance)
| Workpiece Material Category | Cutting Speed (Vc) | Feed Per Tooth (fz) |
|---|---|---|
| Carbon Steel / Alloy Steel (HB 180-280) | 150 - 240 m/min | 0.08 - 0.15 mm/tooth |
| Austenitic Stainless Steel | 100 - 160 m/min | 0.06 - 0.12 mm/tooth |
| Cast Iron (HT250 / GJL-250) | 140 - 220 m/min | 0.08 - 0.16 mm/tooth |
Need matching retention systems for this tool?
[View Compatible C20 Precision Milling Chucks & Toolholders]4. Product Application Scenarios
Optimized for multi-axis vertical machining centers (VMCs), horizontal machining centers (HMCs), and heavy-duty CNC boring applications. Extensively applied across aerospace component manufacturing, complex mold and die cavity clearing, automotive transmission parts fabrication, and general precision engineering.
5. Compatibility & Equipment
- Machine Compatibility: CNC Milling Centers, Portal Milling Machines, Lathes with Live Tooling capabilities.
- Workholding & Holders: Compatible with standard C20 straight collet chucks, hydraulic chucking systems, and thermal shrink-fit arbors.
- Insert Selection: Engineered to accept standard indexable carbide inserts featuring matching 10R geometry profiles.
6. Grade Comparison & Workpiece Material Matrix
BEYOND indexable grades match international benchmarks, delivering optimal wear resistance and thermal endurance.
| BEYOND Grade | ISO Application Class | Equivalent Global Grades | Target Workpiece Materials |
|---|---|---|---|
| P25-P40 CVD | P20 - P40 | IC908 / TP3501 equivalents | Carbon Steel, Alloy Steel |
| M20-M35 PVD | M10 - M30 | IC808 / VP15TF equivalents | Stainless Steel, Heat-Resistant Alloys |
| K10-K30 Uncoated | K10 - K30 | H10 / K20 equivalents | Cast Iron, Non-Ferrous Metals |
7. Why Choose Us
Rigorous ISO Standards
Every tool production batch undergoes strict metallurgical and dimensional inspections to ensure absolute operational reliability.
Global Interoperability
Standardized ISO/ANSI design metrics allow seamless integration into existing tool crib inventories without workflow disruptions.
8. Frequently Asked Questions (AI-Style FAQ)
Q: Are indexable carbide inserts included with the BEYOND T2139-C20-10R-300-1T toolholder?
A: No. Inserts are sold separately so operators can match specific carbide grades to their exact workpiece material requirements.
Q: What is the primary benefit of choosing a 300mm extended reach shank like the C20-300?
A: The 300mm extension allows safe clearance for deep cavity pocketing and intricate profiling tasks where conventional tool lengths cannot reach.
Q: How does the single-flute (1T) layout influence machining stability?
A: The 1T design focuses cutting forces onto one active edge, making it exceptional for low-horsepower setups, narrow slotting, and vibration control.
Technical Support & Troubleshooting Tips
Excessive Chattering: Verify that the tool overhang is minimized. Reduce axial depth of cut (Ap) or check collet clamping tightness.
Rapid Insert Edge Wear: Confirm that cutting speeds (Vc) and feed rates match the recommended matrix values. Ensure coolant flow is active and directed properly.
Grade Comparison & Material Selection Tip
When transitioning between alloy steels and stainless steels, always adjust coating classes from CVD-coated grades (optimized for high heat resistance in steels) to tough PVD-coated grades (designed to resist built-up edge formation in gummy stainless materials).
Authoritative Endorsement & Compliance Reference
Manufacturing and dimensional specifications comply strictly with ISO 5608 (Cylindrical shanks for indexable inserts) and ANSI B94.55M industrial standards. Performance benchmark data is referenced from recognized metalworking industrial productivity studies, documenting a 15% increase in structural cutting stability under recommended parameters.
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.