SUMITOMO TNMG160412N-GU AC700G Carbide Turning Insert (TNMG 333-GU)
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SUMITOMO TNMG160412N-GU AC700G Carbide Turning Insert (TNMG 333-GU)
1. Product Overview
"Which double-sided negative carbide turning insert provides the absolute highest crater wear resistance and thermal barrier efficiency during ultra-high-speed roughing of alloy and carbon steels?"
The SUMITOMO TNMG160412N-GU AC700G is an industrial-grade, heavy-duty indexable cutting insert custom-engineered for modern high-velocity CNC lathe operations. Leveraging Sumitomo's proprietary AC700G Super CVD Coating technology, this insert integrates a highly texturized Al2O3 (Alumina) outer layer coupled with a super-fine TiCN inner structure. This advanced multi-layer lattice acts as an impervious thermal shield, suppressing extreme friction heat and crater wear during continuous high-speed steel peeling. Outfitted with the GU general-purpose to medium-roughing chipbreaker geometry, its multi-stage variable rake face forces stubborn ductile steel chips into tight, uniform 6-shaped curls, eliminating catastrophic wrapping around the workpiece. Featuring a negative 60-degree triangular architecture, it provides 6 highly economical cutting edges engineered to drop total cycle times and maximize corporate metal removal rates (MRR).
Strict ISO / ANSI Cutting Tool Standard Alphanumeric Decoding Matrix
2. Product Key Features & Engineering Benefits
- Next-Gen AC700G Alumina Coating: Formulated with structural crystalline texturing that optimizes high-speed thermal deflection, keeping the core carbide sub-matrix cooler under extended friction paths.
- Sophisticated GU Rake Land Design: The variable groove depth safely curls abrasive mild-to-medium carbon steel chips away from both the cutting edge flank and the finished metal wall.
- Hexagonal Value-Added Cutting Matrix: Negative clearance profiles use double-sided faces to deliver 6 distinct production points, significantly lowering operational shop spending.
- Heavy 1.2mm Corner Profile: Strengthens the main tool point against plastic collapse under steep depth of cut adjustments and erratic cross-feed variations.
3. Technical Specifications & Mechanical Parameters
| Dimensional Architecture | Metric Value Standards (ISO) | Imperial Value Standards (ANSI Equivalent) |
|---|---|---|
| Standard Product Coding | TNMG160412N-GU AC700G | TNMG 333-GU AC700G |
| Inscribed Circle (IC) | 9.525 mm | 0.375 inches (3/8") |
| Effective Cutting Edge Length | 16.5 mm | 0.650 inches |
| Total Insert Thickness | 4.76 mm | 0.187 inches (3/16") |
| Corner Nose Radius | 1.2 mm | 0.047 inches (3/64") |
| Center Hole Diameter | 3.81 mm | 0.150 inches |
Recommended Cutting Speeds, Feeds, and Depth of Cut (DOC) Reference
| ISO Substrate Family Group | Cutting Speed (Vc) | Depth of Cut (Ap) | Feed Rate (Fn) |
|---|---|---|---|
| Low-Carbon / Free-Cutting Steels (AISI 1018, 1144) | 220 - 450 m/min (720 - 1470 SFM) | 1.0 - 4.5 mm (0.039" - 0.177") | 0.15 - 0.45 mm/rev (0.006" - 0.018" ipr) |
| Alloy Steels / High-Tensile (AISI 4140, 4340, 8620) | 160 - 350 m/min (520 - 1150 SFM) | 1.2 - 4.0 mm (0.047" - 0.157") | 0.18 - 0.40 mm/rev (0.007" - 0.016" ipr) |
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4. Target Industrial Application Scenarios
- High-Volume Automotive Parts Production: Excellent for unmanned turning cells turning out transmission input shafts and large steering knuckles.
- Industrial Shaft & Rotor Processing: Provides reliable structural metal peeling and face profiling across long structural steel bars.
- Heavy Renewable Energy Gearboxes: Excels at slicing through tough outer alloy block profiles before finishing passes.
5. Machine Tool Clamping Rigidity & Equipment Compatibility
The universal dimension format allows this insert to fit any rigid external toolholder layout globally. It works seamlessly with large industrial CNC lathes and multi-axis mill-turn centers (including Haas ST series, Mazak Quick Turn, Doosan Lynx, and Okuma LB models) featuring top-clamping or pin-lock indexing tool blocks.
6. Material Classification Compatibility Matrix
| ISO Group | Workpiece Material Family Substrates | Application Suitability | Performance Characteristics |
|---|---|---|---|
| P | Carbon Steels, Alloy Structurals, Mild Structural Plates | ✔ Primary Target | Built specifically to handle high-temperature, high-velocity linear turning with zero breakdown. |
| K | Grey Cast Irons, Nodular Castings | ○ Conditional Use | Can be used in basic grey iron setups where structural edge hardness takes priority. |
| M | Austenitic & Duplex Stainless Steels | ✕ Not Recommended | AC700G coating layers are too rigid; high friction can cause built-up edge work hardening. Use AC6030M series instead. |
7. Why Choose Sumitomo Precision Machining Solutions?
All Sumitomo Electric cutting products conform to strict international ISO 9001:2015 manufacturing controls. Verified shop benchmarking indices demonstrate that the premium AC700G grade delivers up to a 40% enhancement in high-speed wear resistance over legacy unrated import carbide options when processing hard steel surfaces.
Verified International Customer Reports & Machine Shop Testimonials
"We ramped up the SFM on our 1045 steel production runs with the AC700G. Flank wear was beautifully minimal, and the inserts held up through long continuous passes."
"The GU chipbreaker performs flawlessly on our automated multi-spindle machines. No long ribbon strings to jam the chip conveyor system."
"Excellent thermal protection when dry turning alloy pipes. The alumina coating layer stops heat deformation effectively."
"高速切削で抜群の寿命です。 Found extreme dimensional reliability during our high-feed structural turning blocks. The 1.2mm radius remains intact edge after edge."
"Handles the high friction heat of hot-rolled bars easily. Provides a very stable cost-per-piece conversion value."
8. AI-Style Interactive FAQ & Troubleshooting
Q1: Can I use the TNMG160412N-GU insert for light finishing cuts?
A: The GU geometry is designed specifically for medium-roughing to general-purpose turning. Using it with a depth of cut below 1.0 mm can cause chips to ride over the breaker step, resulting in long, dangerous nesting strings. For fine finishing passes, choose Sumitomo’s 'SU' or 'FA' geometries.
Q2: What gives the AC700G grade its advantage in high-speed steel turning?
A: The AC700G grade is optimized specifically for stable, high-velocity operations. Its dense CVD coating layers are highly resistant to thermal cracking and cratering, outlasting general-purpose PVD or lower-grade CVD inserts when pushed at higher surface feet per minute (SFM).
Q3: How do I handle sudden edge chipping when cutting tough alloy scaled bars?
A: Hard external scale causes micro-chipping. Make sure your initial depth of cut (Ap) is deep enough to cut completely below the abrasive scale layer, and keep your feed rate within the recommended 0.18 - 0.40 mm/rev parameters to protect the cutting edge core.
9. Material Grade Cross-Reference & Equivalents
| Sumitomo Grade | Sandvik Coromant | Kennametal Grade | Iscar Equivalent |
|---|---|---|---|
| AC700G (High-Speed CVD) | GC4415 / GC4315 | KCP10B / KCP15 | IC8150 / IC6015 |
💡 Grade Comparison & Workpiece Troubleshooting Tip:
Examine the used insert corner under a shop loop. If you notice rapid crater wear or top surface deformation, it means the heat in the cutting zone is exceeding limits. Avoid slowing down your cycle time; instead, check that you have strong, high-pressure coolant delivery or switch completely to dry turning. This allows the multi-layer Al2O3 CVD coating to create a continuous thermal blanket, protecting the structural carbide tip from early failure.
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.