SUMITOMO TNMG160404L-HM AC630M Turning Insert | TNMG331L-HM
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1. Product Overview
Which turning insert is best suited for machining tough austenitic stainless steel and heat-resistant alloys while preventing work hardening and built-up edge (BUE)?
The SUMITOMO TNMG160404L-HM AC630M (ANSI designation: TNMG331L-HM AC630M) is an industrial-grade, double-sided 60° negative triangular carbide turning insert specifically engineered for stainless steel lathe operations. Utilizing SUMITOMO’s proprietary Absotech® Bronze PVD coating technology (highly nano-structured AlTiN layer), the AC630M grade provides exceptional notch wear resistance, thermal stability, and adhesion resistance. This grade is optimized to conquer work hardening and thermal fatigue typical in ISO M15–M35 machining environments.
Featuring the heavy-to-medium HM Chipbreaker and Left-Hand (L) orientation, this insert incorporates a reinforced cutting land and deep chip groove. This geometry smoothly curls and breaks gummy stainless steel chips across moderate to heavy feeds (0.12–0.38 mm/rev), avoiding ribbon entanglement and extending tool life under demanding cutting conditions.
ISO / ANSI Designation Breakdown
2. Key Features
- Absotech® Bronze PVD Coating: Nano-layered AlTiN coating delivers outstanding lubricity, preventing Built-Up Edge (BUE) and adhesion when machining austenitic stainless steel.
- High Thermal Fatigue Resistance: Resists micro-cracking during wet cutting cycles, delaying thermal notch wear on stainless alloys.
- HM Heavy-Medium Chip Control: Designed with a wide chip pocket and reinforced edge land to break stringy chips smoothly during roughing and medium turning.
- 6 Indexable Cutting Edges: Double-sided negative triangular geometry maximizes edge economy, reducing per-edge tooling costs.
- ISO Class M Precision: Guarantees uniform indexing accuracy and tight dimensional tolerances across high-volume CNC turning production.
3. Specifications & Dual-Unit Comparison
| 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® Bronze PVD (AlTiN Nano-Multilayer) | Absotech® Bronze PVD (AlTiN Nano-Multilayer) |
Recommended Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Austenitic Stainless (304 / 316) | 120 - 220 m/min (390 - 720 SFM) |
0.12 - 0.35 mm/rev (0.005 - 0.014 ipr) |
0.6 - 4.0 mm (0.024 - 0.157 in) |
| Duplex Stainless (2205) | 90 - 170 m/min (295 - 560 SFM) |
0.10 - 0.30 mm/rev (0.004 - 0.012 ipr) |
0.5 - 3.5 mm (0.020 - 0.138 in) |
| Martensitic Stainless (410 / 420) | 140 - 260 m/min (460 - 850 SFM) |
0.12 - 0.38 mm/rev (0.005 - 0.015 ipr) |
0.6 - 4.2 mm (0.024 - 0.165 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
Workpiece Material Matrix (ISO 513 Standard)
| ISO Material Group | Suitability | Common Grade Examples | Performance Rating |
|---|---|---|---|
| M (Stainless Steel) | Primary Choice | Austenitic (304, 316L), Duplex (2205), Martensitic (410, 420) | ★★★★★ (Optimal) |
| P (Steel) | Secondary Choice | Alloy Steels, Low Carbon Steels under interrupted cuts | ★★★★☆ (Very Good) |
| S (Superalloys) | Conditional | Inconel 718, Hastelloy, Titanium Alloys (Ti-6Al-4V) | ★★★☆☆ (Moderate) |
| K (Cast Iron) | Not Recommended | Gray Cast Iron, Ductile Iron | ★☆☆☆☆ (Not Recommended) |
4. Applications
- Pump & Valve Manufacturing: Precision turning of stainless steel pump shafts, body castings, and flanges made of 304/316L.
- Chemical Processing Equipment: Continuous and light interrupted turning on corrosion-resistant Duplex 2205 components.
- Automotive & Aerospace Subassemblies: Heavy roughing to semi-finishing of heat-resistant stainless fasteners and hydraulic fittings.
5. Compatibility
This insert is fully compatible with standard CNC turning centers, swiss-type lathes, multi-tasking machines (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) | AC630M / AC610M | TNMG160404L-HM |
| Sandvik Coromant | GC2015 / GC2220 | TNMG160404-MM / TNMG331-MM |
| Kennametal | KCM25B / KCU10 | TNMG160404MS |
| Iscar | IC6025 / IC807 | TNMG160404-M3M |
| Kyocera | PR1535 / PR1125 | TNMG160404MS |
7. Why Choose Us
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.
Verified Customer Reviews
Turning 316L stainless valve bodies was destroying our previous PVD inserts through notch wear. The AC630M grade doubled our parts per edge and eliminated built-up edge completely.
Hervorragende Standzeit bei 1.4404 Edelstahl. Die HM-Geometrie bricht die Späne selbst bei schwankender Schnitttiefe perfekt.
Ottima finitura superficiale su acciaio inossidabile 304. Nessun problema di truciolo lungo.
SUS304の加工でAC630Mを使用。チッピングがなくなり、長時間の自動運転でも安定しています。
Extremely consistent tool life when turning duplex 2205 shafts. Great resistance to thermal shock.
8. AI-Style FAQ & Troubleshooting
Troubleshooting Quick Reference
| Problem Encountered | Probable Cause | Recommended Solution |
|---|---|---|
| Built-Up Edge (BUE) / Flaking | Cutting speed Vc is too low, causing stainless steel to weld to the tool face | Increase cutting speed Vc by 15-20% into the optimal PVD activation zone (150+ m/min). |
| Notch Wear at Cut Depth Line | Work-hardened surface layer of stainless steel wearing the insert boundary | Vary the depth of cut (ap) on subsequent passes or use a larger approach angle toolholder. |
| Long Unbroken Stringy Chips | Feed rate or depth of cut below HM chipbreaker activation threshold | Increase feed rate f above 0.20 mm/rev to fully engage the HM chip breaker wall. |
In accordance with ISO 513:2012 (Classification and application of hard cutting materials) and verified metalworking laboratory benchmarks from Sumitomo Electric Hardmetal, the Absotech® Bronze PVD coating on AC630M delivers up to 1.8x longer tool life in ISO M25 stainless steel turning compared to standard PVD coatings by minimizing coating shear stress and adhesion 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.