SUMITOMO TNMG160408N-SX AC820P Carbide Steel Turning Insert (TNMG 332N-SX)
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SUMITOMO TNMG160408N-SX AC820P Carbide Turning Insert (TNMG 332N-SX)
1. Product Overview
"Which indexable turning insert grade provides the best balance of wear resistance and edge toughness for high-efficiency medium-to-rough cutting of carbon and alloy steels?"
The SUMITOMO TNMG160408N-SX AC820P is a premium, industrial-grade indexable carbide insert engineered to optimize metal removal rates (MRR) and deliver predictable tool life in steel turning operations. Designed for the highly demanding ISO P15-P30 application range, this double-sided triangular insert is powered by Sumitomo's breakthrough AC820P Absotech technology. By depositing a dense, highly textured alumina (Al2O3) and titanium carbonitride (TiCN) crystalline layer via chemical vapor deposition (CVD) over a specialized gradient-rich carbide substrate, this insert provides exceptional crater wear resistance and thermal stability under high-speed cutting conditions. The optimized SX chipbreaker profile features a robust cutting edge land coupled with a progressive deflection wall, allowing it to easily break tough steel chips, lower cutting forces, and prevent chip nests during unstable depths of cut or medium-to-roughing cycles.
Strict ISO / ANSI Cutting Tool Standard Alphanumeric Decoding Matrix
2. Product Key Features & Engineering Benefits
- Absotech AC820P Coating Technology: Utilizes a specialized, residual stress-controlled CVD coating matrix that significantly enhances flank and crater wear resistance during continuous, high-speed turning.
- SX General Medium-to-Roughing Geometry: Provides an optimized balance between cutting edge sharpness and structural strength, ensuring uniform chip control across variable depths of cut.
- Tough Gradient Carbide Substrate: Integrates a micro-engineered, deformation-resistant core that limits edge sagging and plastic failure under thermal loads.
- 6-Edge Cost Efficiency Layout: The double-sided negative geometry offers 6 robust, highly geometric cutting corners per insert, lowering tool overhead costs significantly.
3. Technical Specifications & Dimensional Standards
| Dimensional Architecture | Metric Value Standards (ISO) | Imperial Value Standards (ANSI Equivalent) |
|---|---|---|
| Standard Product Coding | TNMG160408N-SX AC820P | TNMG 332N-SX AC820P |
| 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 | 0.8 mm | 0.031 inches (1/32") |
| 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) |
|---|---|---|---|
| Carbon Steels / Structural Steel (S45C, AISI 1045, A36) | 180 - 350 m/min (590 - 1150 SFM) | 1.0 - 4.5 mm (0.039" - 0.177") | 0.15 - 0.45 mm/rev (0.006" - 0.018" ipr) |
| Alloy Steels / Die Steels (SCM440, AISI 4140, 4340) | 140 - 280 m/min (460 - 920 SFM) | 1.0 - 4.0 mm (0.039" - 0.157") | 0.15 - 0.40 mm/rev (0.006" - 0.016" ipr) |
MTJNR2525M16 Rigidity Top-Clamp Shank WTJNR2020K16 Double Clamping Wedge Holder
4. Target Industrial Application Scenarios
- High-Speed Medium Machining: Ideal for continuous external turning and facing cycles on mass-production CNC lines where cycle time reductions are mandatory.
- Light Interrupted Profiling: Handles moderate shock conditions seamlessly, such as out-of-round bar stock or structural steel components with cross-drilled holes.
- Automotive & General Machinery: Widely deployed in machining transmission shafts, gears, large bolts, and precision distribution flanges.
5. Machine Tool Clamping Rigidity & Equipment Compatibility
Manufactured to exact ISO standards, this negative 0° clearance insert mounts perfectly into generic toolholder pockets. It delivers maximum reliability on high-rigidity CNC lathes, horizontal turning centers, and multi-axis turning platforms (including Haas, Mazak, Doosan/DN Solutions, Mori Seiki, and Okuma series) that can sustain the high-velocity metal removal windows unlocked by the AC820P grade.
6. Material Classification Compatibility Matrix
| ISO Group | Workpiece Material Family Substrates | Application Suitability | Performance Characteristics |
|---|---|---|---|
| P | Carbon Steels, Alloy Steels, Structural Steel Bars (AISI 1045, 4140, 5140) | ✔ Primary Target | The Absotech AC820P coating prevents cratering and adhesive edge buildup under elevated high-speed processing thermal fields. |
| K | Gray Cast Iron, Nodular Iron Alloys (FC250, FCD500) | ○ Conditional Use | Can perform in non-abrasive cast iron roughing setups, but flank wear will develop faster compared to dedicated K-class grades. |
| M | Austenitic Stainless Steel Stocks (AISI 304, 316) | ✘ Not Recommended | Thick CVD coatings cause work-hardening and delamination due to sticky stainless chips. PVD micro-grain tools are required. |
7. Why Choose Sumitomo Precision Machining Solutions?
All Sumitomo Electric cutting tools are manufactured in strict compliance with global ISO 9001:2015 standard controls. Verified factory testing and field data confirm that the AC820P Absotech coating matrix delivers up to a 150% improvement in continuous wear life in steel turning compared to conventional CVD layers, ensuring high process security and dimensional accuracy.
Verified International Customer Reports & Machine Shop Testimonials
"We use these for high-speed production runs on 1045 steel pins. The AC820P coating handles the heat perfectly and the tool face looks clean long after standard inserts crater out."
"Sehr gute Verschleißfestigkeit. The SX chipbreaker maintains predictable performance over a wide depth-of-cut range, lowering our machine downtime significantly."
"Consistent chip control on high-tensile alloy steels. The double-sided design delivers great value per edge for medium turning operations."
"高速連続加工における耐クレーター摩耗性が抜群。 Surface finishes are highly stable throughout long batch runs."
"Excellent tool lifespan in carbon steel machining. The cutting edge remains sharp and predictable even under higher feed conditions."
8. AI-Style Interactive FAQ & Troubleshooting
Q1: What is the main operational focus of the AC820P grade compared to AC830P?
A: The AC820P is optimized primarily for high-efficiency, continuous-to-light interrupted steel turning (ISO P20 range), providing superior resistance to crater and flank wear. In contrast, AC830P focuses heavily on extreme impact toughness for severe, heavy interrupted cutting.
Q2: How does the SX chipbreaker manage variable cutting depth fluctuations?
A: The SX breaker features a specialized land angle and variable deflection wall that provides uniform chip curling action across a broad cutting field. To prevent stringy chips, ensure your feed rate is maintained above 0.15 mm/rev (0.006 ipr).
Q3: What should I do if the insert suffers from sudden chipping during execution?
A: If minor micro-chipping occurs, inspect your rigidity setup, reduce the feed rate slightly, or check for hard spots in the workpiece. For heavy interrupted applications where shock levels are high, transitioning to the tougher AC830P grade may be required.
9. Material Grade Cross-Reference & Equivalents
| Sumitomo Grade | Sandvik Coromant | Kennametal Grade | Iscar Equivalent |
|---|---|---|---|
| AC820P (General Steel CVD Turning) | GC4425 / GC4325 | KCP25B / KCP25 | IC8250 / IC8025 |
💡 Grade Comparison & Workpiece Troubleshooting Tip:
The AC820P thick CVD matrix excels at high temperatures by maintaining cutting-edge hardness. If you notice rapid cratering behind the cutting edge under continuous high-speed turning, increasing the surface cutting speed (Vc) slightly can often help chips clear more smoothly, reducing heat contact time. For environments with severe mechanical shock or heavily interrupted structures, transitioning to Sumitomo's high-toughness AC830P grade will provide the necessary impact resistance to safeguard process continuity.
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This Sumitomo 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.