TaeguTec CCMT120408MT TT8125 | CVD Turning Insert for Steel Machining
Price shown is a starting point. Contact us for a precise quote based on your requirements.
TaeguTec CCMT120408MT TT8125
Professional CVD Turning Grade for High-Efficiency Steel Machining
Product Overview
"Which insert grade is the best all-rounder for high-speed medium turning in various carbon steels and alloy steels while maintaining edge security?"
The TaeguTec CCMT120408MT TT8125 is an 80° rhombic turning insert specifically engineered for ISO P (Steel) materials. Utilizing TaeguTec’s advanced TT8125 CVD coating, this insert features a thick Al2O3 thermal barrier that protects the carbide substrate from the high heat generated during high-speed turning. The MT chipbreaker (Medium Turning) is a versatile geometry that balances edge strength with a sharp cutting action, significantly reducing bird-nesting of chips in gummy steels and ensuring stable performance even in light interrupted cuts.
Key Features
Thick coating layer allows for aggressive surface speeds (Vc) without cratering.
Designed to provide consistent chip breaking across a broad range of feed rates (fn).
The 0.8mm radius offers superior edge strength for rougher applications and interrupted passes.
Technical Specifications
ISO Code Decoding: CCMT120408MT
80° Rhom.
7° Relief
Tolerance
Screw Fix
12.9mm L
4.76mm S
0.8mm Rad.
Chipbreaker
| Unit | Model Number | Inscribed Circle (IC) | Thickness (S) |
|---|---|---|---|
| Metric (ISO) | CCMT120408MT | 12.7 mm | 4.76 mm |
| Imperial (ANSI) | CCMT432MT | 0.500" | 0.187" |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon Steel (ISO P) | 180 - 360 m/min | 0.12 - 0.35 mm/rev |
| Alloy Steel (ISO P) | 150 - 300 m/min | 0.10 - 0.28 mm/rev |
Compatible Holders
This CCMT 12 size insert is precision-matched for SCLCR/L 12 external toolholders and S-SCLCR/L 12 boring bars.
Product Applications
- High-speed medium turning of automotive drivetrain shafts and gear blanks.
- Precision boring and turning of 4140, 4340, and 1045 alloy/carbon steels.
- Machining of structural steel components in mass production environments.
- General job-shop operations involving various steel grades and light surface scale.
TaeguTec Grade Comparison (Steel ISO P)
| Grade | Coating | Main Benefit |
|---|---|---|
| TT8125 (CVD) | CVD Al2O3 | Versatility: Best all-rounder for steel. |
| TT8115 (CVD) | CVD Al2O3+TiCN | Speed: Maximum wear resistance at high speeds. |
Why Choose TaeguTec?
TaeguTec, as a member of the IMC Group, leads the industry in solving metal-cutting challenges through high-performance metallurgy. The TT8125 grade represents a breakthrough in CVD coating technology, allowing machinists to push their CNC centers to higher RPMs without sacrificing tool integrity. When you choose TaeguTec, you invest in South Korean engineering that prioritizes predictable tool life and high surface integrity, ultimately lowering your cost-per-part in high-volume production.
Verified Global Feedback
"Reliable daily driver"
We use TT8125 for 90% of our carbon steel jobs. Predictable wear patterns mean no surprises during late-night shifts.
— Precision Lathe (USA)"Top Performance"
Outstanding chip control in 4140. The MT breaker manages chips well even at light depths of cut.
— Werkzeugbau GmbH (Germany)"Ottima per Acciaio"
Excellent heat resistance. We increased surface speed by 15% and tool life remained stable.
— Meccanica di Precisione (Italy)Frequently Asked Questions
1. Is TT8125 suitable for Stainless Steel?
While it can cut steel/inox alloys, it is optimized for ISO P (Steel). For true stainless (ISO M), we recommend TT8020 or TT7015.
2. When should I choose the 0.8mm radius over 0.4mm?
The 0.8mm radius (CCMT120408) provides a stronger cutting edge and higher feed capabilities. Choose this for rougher turning or when a larger fillet radius is required.
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.