TaeguTec CNMG120404FG TT8125 | Carbide Finishing Insert for Steel
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💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
TaeguTec CNMG120404FG TT8125
Precision Finishing Excellence: Advanced CVD Grade for Superior Steel Surface Ra
Product Overview
"Which carbide insert grade offers the best chip control and mirror-like surface finish when performing fine-turning operations on steel parts?"
The TaeguTec CNMG120404FG TT8125 is a high-precision 80° rhombic insert purpose-built for ISO P (Steel) finishing. By combining the versatile TT8125 CVD grade with the specialized FG (Finishing) chipbreaker, this insert excels in maintaining tight tolerances and low surface roughness. The FG geometry features a sharp cutting edge and a specific rake profile that effectively breaks chips even at very light depths of cut, preventing the "bird-nesting" that often plagues finishing cycles in carbon and alloy steels.
Key Features
Thick Al2O3 + TiCN coating layers provide a superior thermal barrier, ensuring the cutting edge stays sharp longer during high-Vc finishing.
Engineered specifically for low feed rates (0.05 - 0.20 mm/rev) to achieve exceptional surface Ra and dimensional accuracy.
Smooth coating surface minimizes built-up edge (BUE), which is critical for maintaining surface integrity on steel workpieces.
Technical Specifications
ISO Code Decoding: CNMG120404FG
80° Rhom.
0° Relief
Tolerance
Fixing
12.9mm L
4.76mm S
0.4mm RE
Finishing
| Unit System | Designation | Inscribed Circle (IC) | Radius (RE) |
|---|---|---|---|
| Metric (ISO) | CNMG120404FG | 12.7 mm | 0.4 mm |
| Imperial (ANSI) | CNMG431FG | 0.500" | 0.016" |
Recommended Cutting Parameters
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Low Carbon Steel | 220 - 480 m/min | 0.05 - 0.25 mm/rev |
| Alloy Steel (e.g., 4140) | 180 - 400 m/min | 0.08 - 0.20 mm/rev |
Compatible Toolholders
This finishing insert is compatible with standard DCLNR/L 12, PCLNR/L 12, and MCLNR/L 12 series external turning holders.
Product Applications
- Final finishing of automotive steel shafts and precision pins.
- Mirror-finish turning of carbon steel decorative or hydraulic components.
- Machining of alloy steel gears where tight dimensional tolerances are mandatory.
- General-purpose finishing across a wide variety of ISO P material grades.
TaeguTec Grade Comparison (Steel)
| Grade Name | Tech Profile | Best For |
|---|---|---|
| TT8125 (CVD) | Multi-Layer Al2O3 | Universal: General purpose steel turning. |
| TT8115 (CVD) | High-Hardness Al2O3 | High Speed: Continuous finishing at max Vc. |
Why Choose TaeguTec?
TaeguTec, as a premium member of the IMC Group, stands at the pinnacle of metallurgical innovation. The TT8125 grade and FG chipbreaker synergy is a strategic investment for CNC shops that prioritize surface quality and dimensional accuracy. By selecting TaeguTec, you invest in industrial-grade consistency that reduces scrap rates, increases throughput, and delivers the lowest cost-per-part in professional manufacturing.
Verified Global Feedback
"Flawless Finishing"
Replaced our standard finishing grade with TT8125 FG. The surface finish on our 4140 parts is night and day. Mirror-like result.
— Precision Machining (USA)"Perfect Chip Control"
Finally, an insert that doesn't produce bird-nesting on light cuts! The FG breaker works perfectly even at 0.1mm DOC.
— CNC Solutions GmbH (Germany)"Long Tool Life"
Stable edge performance during long finishing passes. We maintained tolerance across a batch of 200 parts easily.
— Manufacturing Corp. (Japan)Frequently Asked Questions
1. Is the FG chipbreaker suitable for roughing?
No. The FG geometry is designed specifically for finishing (small depth of cut and low feed). For roughing, please use MT or RT chipbreakers.
2. Can I use this grade for dry machining?
Yes. The CVD coating on TT8125 acts as an excellent thermal shield, though using coolant will always result in a superior surface finish in steel.
Need Help With taegutec Inserts?
Looking for a taegutec 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 taegutec insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.