Taegutec SPMG140512DG TT8020 Carbide Insert for CNC U-Drill (10pcs)
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TaeguTec SPMG140512DG TT8020
Heavy-Duty Drilling Power: Superior Stability for Large Diameter Holes in Steel & Stainless
Product Overview
"Which indexable insert provides the highest edge security and heat resistance for large-scale drilling operations in alloy steel and gummy stainless?"
The TaeguTec SPMG140512DG TT8020 is a powerhouse indexable drilling insert specifically designed for large-diameter TOPDRILL and DrillRush bodies. At the 14mm size class, this insert is built to withstand massive cutting forces. The TT8020 grade features a high-performance PVD coating over a tough carbide substrate, engineered to resist thermal cracking and flank wear in ISO P (Steel) and ISO M (Stainless Steel). The DG chipbreaker is optimized for high-feed drilling, effectively curling and breaking chips to ensure they flush easily from deep cavities without damaging the hole wall or the tool body.
Core Advantages
A thick, multi-layered AlTiN coating acts as a thermal barrier, allowing for higher cutting speeds and preventing built-up edge (BUE) in stainless steel.
The DG chipbreaker reduces axial forces and optimizes chip formation, ensuring the drill remains centered even at aggressive feed rates.
The larger 1.2mm radius significantly increases edge strength, preventing chipping during the high-impact entrance phase of drilling.
Technical Specifications
ISO Code Decoding: SPMG 140512 DG
Square
11° Relief
Tol. Class M
W/ Hole
14.3mm L
5.20mm T
1.2mm RE
| System | Model | Side Length (L) | Thickness (S) |
|---|---|---|---|
| Metric | SPMG 140512 DG | 14.30 mm | 5.20 mm |
| Imperial | SPMG 544 DG | 0.563" | 0.205" |
Recommended Cutting Parameters
| Material Group | Vc (m/min) | fn (mm/rev) |
|---|---|---|
| Carbon Steel (P) | 120 - 240 | 0.10 - 0.22 |
| Stainless Steel (M) | 80 - 160 | 0.08 - 0.16 |
Heavy-Duty Drilling Holders
Optimized for TaeguTec TOPDRILL and DrillRush bodies (Size 14 inserts).
Industrial Applications
- Deep-hole drilling in large structural steel plates and forged components.
- Machining of thick-walled stainless steel pressure vessels and heat exchangers.
- Heavy equipment manufacturing (earthmoving, mining, and energy sectors).
- High-torque drilling operations on horizontal boring mills and large CNC centers.
TaeguTec Grade Comparison Guide
Standard choice for maximum heat resistance and edge stability in P and M materials.
Ultimate toughness grade. Essential for interrupted cuts and high-vibration large-hole drilling.
Engineered for Heavy Industry
The SPMG140512DG represents the peak of indexable drilling toughness. When you are drilling large diameters, any tool failure results in massive downtime. By utilizing the TT8020 grade, TaeguTec provides the security needed for "lights-out" production and high-value workpieces. The 1.2mm radius and reinforced substrate make this the most reliable insert for heavy drilling on the market.
"Drastic reduction in edge chipping on our forged steel jobs. The TT8020 grade is bulletproof."
— Production Manager (USA)Beste Wahl für große Bohrungen in Edelstahl. Die Standzeit ist beeindruckend.
— CNC Fertigungsleiter (Germany)Eccellente controllo del truciolo. Nessun intasamento anche a profondità elevate.
— Meccanica Pesante (Italy)Very stable performance on large lathes. Great value for high-volume jobs.
— Tooling Engineer (Japan)Frequently Asked Questions
1. What is the impact of the 1.2mm radius on hole quality?
The 1.2mm radius increases edge strength, which is vital for large diameters. While it might slightly increase radial forces, it provides much better surface finish and tool life in heavy roughing.
2. How much coolant pressure do I need for SPMG 14 inserts?
For large-diameter drilling (Size 14), we recommend a minimum of 20-30 bar (300-450 PSI) to ensure chips are forcibly removed from the deep drill path.
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.