TaeguTec TNMG160408MC TT8115 CVD Coated Carbide Turning Insert | 10 Pcs/Box
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TaeguTec TNMG160408MC TT8115 Inserts
High-Speed Steel Medium Turning & Roughing | TT8115 CVD Coated Grade | Box of 10 Pcs
"Which negative 60-degree triangular CVD-coated carbide insert with a 0.8mm corner radius and MC chipbreaker is best for high-speed continuous turning, heavy medium-duty machining, and reliable chip control in carbon steels and alloy steels?"
The TaeguTec TNMG160408MC TT8115 is a high-performance, double-sided, negative-rake 60° triangular turning insert engineered specifically for demanding medium-to-roughing turning operations, high-speed continuous cuts, and high-rigidity external profiling across carbon steels (ISO P) and alloy steels. Powered by TaeguTec's advanced TT8115 multi-layer CVD coated carbide grade, this insert combines a high-strength tungsten carbide substrate with a thick, heat-resistant chemical vapor deposition (CVD) coating designed to withstand extreme thermal loads, high cutting speeds, and severe abrasive flank wear. Unlike PVD coatings which maintain a sharper edge for lower-speed stainless steels, thick multi-layer CVD coatings excel in continuous steel turning by offering exceptional thermal insulation and crater wear protection at elevated spindle speeds. Paired with a robust 0.8mm nose radius for enhanced edge strength and the specialized MC medium chipbreaker featuring a wide dual-action geometry, it delivers smooth chip evacuation, excellent chip curling across moderate-to-heavy feeds, and superior tool life. Whether you are exploring our extensive TaeguTec TNMG collection, comparing alternate negative geometries in TaeguTec CNMG, TaeguTec DNMG, and TaeguTec negative turning inserts, or evaluating multi-brand options from Korloy TNMG, ZCC-CT TNMG, and Tungaloy TN triangle turning inserts, the TNMG160408MC TT8115 delivers elite productivity. Review foundational concepts in our guides on what is a turning holder, what is a carbide drill, solid vs indexable milling, CNMG grade cross reference, chipbreaker families, carbide insert nose radius, stainless steel speeds and feeds, inserts by material, inserts by operation, and top global CNC insert brands.
Core Engineering Advantages
TT8115 Multi-Layer CVD Grade
Thick chemical vapor deposition (CVD) coating delivers outstanding thermal barrier properties and resistance against flank wear in high-speed steel turning.
MC Medium Chipbreaker
Dual-action geometry engineered for stable chip curling and reliable breaking across medium-to-heavy depths of cut in carbon steels.
0.8mm Radius & 60° Negative Geometry
Double-sided 6-edge economy with robust 0.8mm corner radius provides maximum edge strength and impact resistance under high feed rates.
ISO Code Specification Breakdown
Technical Specifications & Dimensional Comparison
| Parameter | Metric (Standard) | Imperial Equivalent |
|---|---|---|
| ISO / ANSI Designation | TNMG 160408-MC | TNMG 332-MC (Approx.) |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (RE) | 0.80 mm | 0.0315" (approx. 1/32") |
| Grade & Substrate | TT8115 (Multi-Layer CVD Coated Carbide) | High-Speed Steel CVD Coated Carbide |
Recommended Cutting Parameters
*Values are starting recommendations for medium-to-rough turning and continuous steel cutting with TT8115 CVD grade.
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (Ap) |
|---|---|---|---|
| Carbon & Low Alloy Steels (P - 1045 / 4140) | 200 - 360 m/min | 0.17 - 0.40 mm/rev | 0.70 - 3.50 mm |
| Alloy Steels & Structural Steels | 180 - 320 m/min | 0.17 - 0.38 mm/rev | 0.70 - 3.20 mm |
| Pre-Hardened Steels (< 38 HRC) | 140 - 260 m/min | 0.15 - 0.35 mm/rev | 0.50 - 3.00 mm |
Compatible Tool Holders & Boring Bar Resources
Pair these precision 16-size negative triangular inserts with rigid external and internal toolholders such as the MTQNR2020K16 External Turning Tool Holder, MTQNR2525M16 Turning Holder, MTWNR2020K16 Tool Holder, and Beyond S16Q-STFNR16 Boring Bar.
Explore our complete modular systems via Beyond screw-type external turning holders and screw-on system boring bars.
Industrial Applications
- High-Speed Steel Medium Turning & Roughing: Engineered for continuous cutting and aggressive metal removal rates on carbon and alloy steel shafts and forged components.
- Rigid External Profiling & Facing: Negative 0° clearance geometry provides maximum wedge strength to absorb heavy clamping forces and intermittent shock loads.
- Multi-Brand Tooling Consolidation: Fully compatible with standard ISO negative 60° triangular turning toolholders across TaeguTec TNMG, Korloy TNMG, ZCC-CT TNMG, and Tungaloy TN triangle inserts.
TaeguTec Grade Selection Matrix
Selecting the optimal TaeguTec turning grade for negative inserts:
- TT8115 (Featured - CVD Coated Grade): Multi-layer CVD coated carbide grade engineered specifically for high-speed continuous turning and medium roughing in carbon steels and alloy steels (ISO P) where superior thermal barrier protection is required.
- TT8125 (CVD Coated Grade): Tougher multi-layer CVD grade optimized for general purpose turning and medium-to-heavy cuts in carbon steels under varying cutting speeds.
- TT9225 (PVD Coated Grade): Nano-PVD coated grade designed for stainless steel machining (ISO M) and interrupted cuts where edge toughness is essential.
Why Machinists Choose Our Store
100% Genuine Guarantee
Directly sourced original TaeguTec factory-sealed packages (10 pcs/box).
Same-Day Dispatch
In-stock cutting tools ship rapidly to keep your CNC spindles turning.
Technical Engineering Support
On-staff tooling specialists available for speed and feed recommendations.
Frequently Asked Questions
Q: When should I choose CVD grade TT8115 instead of TT8125 or PVD grades?
A: Choose TT8115 CVD coated inserts for high-speed continuous turning and medium roughing in carbon and alloy steels where maximum thermal insulation and flank wear resistance at high RPM are needed. Choose TT8125 for general purpose versatility or PVD grades for stainless steels.
Q: What is the main benefit of the MC chipbreaker?
A: The MC chipbreaker is specifically engineered for medium-to-rough turning in steels, providing reliable chip breaking and stable chip flow across moderate-to-heavy feed rates.
Q: How many cutting edges are available on each TNMG insert?
A: Being a double-sided negative triangular insert, TNMG 1604 provides 6 indexable cutting edges (3 on the top face and 3 on the bottom face), maximizing tool economy.
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.