SUMITOMO TNMG160404N-GU AC700G Turning Insert | TNMG 331N-GU Carbide Insert
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SUMITOMO TNMG160404N-GU AC700G Carbide Turning Insert (TNMG 331N-GU)
1. Product Overview
Looking for the best indexable carbide insert to optimize high-efficiency steel turning operations with maximum tool life?
The SUMITOMO TNMG160404N-GU AC700G (ANSI Designation: TNMG 331N-GU AC700G) is a premium double-sided 60° triangular turning insert engineered for general-to-medium cutting of carbon steels, alloy steels, and tool steels. Featuring Sumitomo’s proprietary AC700G grade technology and the versatile GU chipbreaker geometry, this insert resolves severe chip wrapping, premature flank wear, and thermal edge degradation during demanding CNC lathe operations.
Material Substrate: AC700G Grade
The AC700G grade utilizes an ultra-fine grain tungsten carbide (WC-Co) substrate coated with Sumitomo's high-adhesion Multi-Layer PVD (TiAlN/TiCN) structure. It provides thermal barrier protection up to 1,000°C, extreme edge toughness, and resistance to plastic deformation during high-speed machining.
Chipbreaker Engineering: GU Geometry
The GU chipbreaker features a low-resistance rake face design with a negative land and optimized variable rake angle. It maintains low cutting forces while providing smooth, curl-controlled chip evacuation across depth of cuts from 0.5mm to 3.5mm.
2. Key Features
3. Technical Specifications & Nomenclature Breakdown
ISO / ANSI Standard Code Explanation
Metric vs. Imperial Comparison Table
| Specification Parameter | Metric (ISO Standard) | Imperial (ANSI Standard) |
|---|---|---|
| Insert Model | TNMG 160404N-GU AC700G | TNMG 331N-GU AC700G |
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.1875 in (3/16") |
| Corner Radius (RE) | 0.4 mm | 0.0156 in (1/64") |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (Ap) |
|---|---|---|---|
| Steel (ISO P10 - P25) | 180 – 320 m/min (590–1050 SFM) | 0.12 – 0.35 mm/rev | 0.8 – 3.5 mm |
| Alloy Steel (ISO P20 - P35) | 140 – 260 m/min (460–850 SFM) | 0.10 – 0.30 mm/rev | 0.5 – 3.0 mm |
Matching Toolholders Links & Hardware
This insert requires an ISO negative turning holder with pin and clamp mechanism:
4. Target Applications
- Automotive Parts Turning: Shafts, transmission gears, hub bearings.
- General Mechanical Parts: Thread turning blanking, step OD turning, facing, and chamfering.
- Heavy Machinery Equipment: Forged steel components and flanges.
5. Machine & Toolholder Compatibility
Fully integrated with all standard ISO/ANSI lathe toolholders across CNC lathes, multi-tasking centers, and turning machines from Sandvik Coromant, Kennametal, Iscar, Mitsubishi, Kyocera, and Tungaloy.
6. Grade Comparison, Equivalent Models & Troubleshooting
Equivalent Grade Matrix
| Brand | Equivalent Grade | Coating Process |
|---|---|---|
| SUMITOMO | AC700G | PVD Multi-Layer |
| Sandvik | GC4325 / GC1125 | CVD / PVD |
| Kennametal | KCP10B | PVD TiAlN |
Troubleshooting Guide
| Symptom | Root Cause | Corrective Action |
|---|---|---|
| Rapid Flank Wear | Cutting speed (Vc) too high | Reduce Vc by 15-20% |
| Built-Up Edge (BUE) | Cutting speed too low | Increase Vc & verify coolant flow |
7. Why Choose Us & Customer Reviews
"Tool life increased by 40% per corner on 4140 shaft line. The GU chipbreaker chip control is outstanding!"
"Exzellente Standzeit beim Drehen von Legierungsstahl. High thermal cracking resistance."
8. Frequently Asked Questions (AI & Voice Search Optimized)
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.