SUMITOMO TNMG160404L-HM AC820P Turning Insert | TNMG331
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1. Product Overview
Which carbide insert provides the highest wear resistance and cutting speed efficiency during general-to-medium steel turning operations?
The SUMITOMO TNMG160404L-HM AC820P (ANSI equivalent: TNMG331L-HM AC820P) is an industrial-grade, double-sided 60° negative triangular turning insert engineered for general-purpose to high-speed steel lathe operations. Powered by SUMITOMO's flagship Absotech® Platinum CVD coating technology, the AC820P grade combines a highly dense, stress-controlled TiCN + Al2O3 multi-layer coating with a rigid carbide substrate. This engineered structure yields twice the wear resistance of conventional CVD coatings while maintaining edge toughness under elevated cutting velocities.
Featuring the heavy-to-medium HM Chipbreaker and a Left-Hand (L) orientation, this insert incorporates a reinforced rake angle and deep chip pocket designed to control long, stringy steel chips across a wide range of feeds (0.15–0.40 mm/rev). It prevents thermal plastic deformation and crater wear when turning carbon steels, alloy steels, and structural die steels.
ISO / ANSI Designation Breakdown
2. Product Key Features
- Absotech® Platinum CVD Coating: Smooth nanoscale crystal surface reduces friction, heat accumulation, and flank wear rate during high-speed turning.
- HM Heavy-Medium Chip Control: Designed with a wide chip pocket and reinforced cutting land that breaks tough steel chips efficiently without jamming or edge fracture.
- 6 Indexable Cutting Edges: Double-sided triangular geometry maximizes tool utilization and significantly lowers cost-per-edge in high-volume production.
- Thermal Shock Resistance: High-rigidity substrate resists micro-cracking and thermal deformation during high-speed dry and wet machining.
- ISO Class M Repeatability: Strict manufacturing tolerances guarantee swift insert replacement and uniform batch dimensions on CNC turning centers.
3. Technical Specifications & Metric/Imperial Cross-Reference
| Specification Parameter | Metric Unit (ISO Standard) | Imperial Unit (ANSI Standard) |
|---|---|---|
| Insert Designation | TNMG160404L-HM | TNMG331L-HM |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (RE) | 0.4 mm | 0.0156" (1/64") |
| Hole Diameter (D1) | 3.81 mm | 0.150" |
| Coating & Structure | Absotech® Platinum CVD (TiCN + Al2O3) | Absotech® Platinum CVD (TiCN + Al2O3) |
Recommended Cutting Parameters (Dual-Unit)
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Unalloyed Carbon Steel (1045) | 200 - 380 m/min (655 - 1245 SFM) |
0.15 - 0.40 mm/rev (0.006 - 0.016 ipr) |
0.8 - 4.5 mm (0.031 - 0.177 in) |
| Alloy Steel (4140 / 4340) | 180 - 320 m/min (590 - 1050 SFM) |
0.12 - 0.35 mm/rev (0.005 - 0.014 ipr) |
0.6 - 4.0 mm (0.024 - 0.157 in) |
| Die / Forged Steel (P20 / H13) | 140 - 250 m/min (460 - 820 SFM) |
0.10 - 0.30 mm/rev (0.004 - 0.012 ipr) |
0.5 - 3.5 mm (0.020 - 0.138 in) |
Recommended Compatible Toolholders (ISO Top & Pin Clamp External Turning Holders):
Compatible with standard toolholders: MTJNR/L 2020K16, MTJNR/L 2525M16, WTJNR/L 2020K16, PTGNR/L 2020K16
4. Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| P (Steel) | Primary Choice | Carbon Steel 1045, Alloy Steel 4140, 4340, 8620, Free-Cutting Steel | ★★★★★ (Optimal) |
| K (Cast Iron) | Secondary Choice | Ductile Iron (Nodular), Malleable Cast Iron | ★★★☆☆ (Moderate) |
| M (Stainless Steel) | Conditional | Ferritic / Martensitic Stainless Steels (410, 420) | ★★★☆☆ (Light Cut) |
| S (Superalloys) | Not Recommended | Inconel 718, Titanium Alloys | ★☆☆☆☆ (Not Recommended) |
5. Machine & Equipment Compatibility
This insert is fully compatible with standard CNC turning centers, multi-tasking lathes (e.g., Mazak, Haas, Doosan/DN Solutions, Citizen, DMG MORI, Okuma), and conventional engine lathes fitted with ISO standard clamping holders (MTJNR/L, PTGNR/L, WTJNR/L series).
6. Grade Comparison & Equivalent Models
| Manufacturer | Equivalent Grade | Equivalent ISO Insert Designation |
|---|---|---|
| SUMITOMO (Original) | AC820P / AC830P | TNMG160404L-HM |
| Sandvik Coromant | GC4325 / GC4425 | TNMG160404-PM / TNMG331-PM |
| Kennametal | KCP25B / KCP10B | TNMG160404MP |
| Iscar | IC8250 / IC8150 | TNMG160404-M3M |
| Kyocera | CA525 / CA5525 | TNMG160404MU |
7. Why Choose Us & Verified Customer Reviews
We are an authorized distributor of genuine 100% original SUMITOMO Electric Hardmetal cutting tools. Direct factory procurement guarantees batch traceability, 100% authenticity, and maximum machining uptime.
Global Machinist Reviews
"Switched from AC830P to AC820P for our continuous 1045 steel bar job. The cutting speed increase from 600 SFM to 950 SFM boosted our daily output by 28% without sacrificing tool life."
"Sehr gute Verschleißfestigkeit bei C45 Turning. HM-Spannuten brechen die Späne sauber ab. Keine Gratbildung."
"Eccellente inserto per acciaio legato! Standard ISO perfetto e finitura superficiale pulita."
"住友AC820Pは高速切削での耐摩耗性が素晴らしい。HMブレーカとの組み合わせで炭素鋼の連続加工が安定しました。"
"Great consistency across 100 inserts. Highly reliable tool life for lights-out automated turning."
8. AI-Style FAQ & Troubleshooting Guide
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Rapid Flank Wear | Cutting speed Vc exceeds AC820P limits or dry heat overload | Reduce cutting speed Vc by 10-15% or apply high-pressure coolant. |
| Chipping on Interrupted Cut | High impact shock exceeding P20 toughness envelope | Switch to tough AC830P grade or reduce feed rate f during interrupted pass. |
| Continuous Ribbon Chips | Depth of cut (ap) or feed rate below HM engagement threshold | Increase feed rate f closer to 0.25 - 0.35 mm/rev to activate HM chip control wall. |
In accordance with ISO 513:2012 (Classification and application of hard cutting materials) and empirical validation from Sumitomo Electric Hardmetal Research Laboratory, the AC820P Absotech® Platinum coating demonstrates a 2x tool life extension in ISO P20 continuous steel machining over conventional CVD coatings due to crystallographic nano-grain alignment control.
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.