SUMITOMO TNMG160404N-UX AC820P Steel Turning Carbide Insert (TNMG 331N-UX)
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SUMITOMO TNMG160404N-UX AC820P Steel Turning Carbide Insert (ANSI: TNMG 331N-UX)
1. Product Overview
"Which indexable insert is best for high-efficiency general steel turning across continuous to light-interrupted cuts?"
The SUMITOMO TNMG160404N-UX AC820P (ANSI: TNMG 331N-UX) is SUMITOMO's premier, first-choice general-purpose steel turning grade. Designed for ISO P10–P25 carbon steel, alloy steel, and forged component turning, it delivers an ideal equilibrium between extreme wear resistance and impact edge toughness.
Engineered with a neutral edge orientation ('N') and a precision 0.4mm (1/64") nose radius, the TNMG160404N-UX insert excels in vibration-sensitive turning, thin-walled shaft machining, and profiling operations. The neutral design allows seamless utilization in both right-hand and left-hand external turning toolholders (such as MTJNR/L and MTGNR/L) as well as internal boring bars.
Featuring SUMITOMO's flagship Absotech Platinum CVD Coating Technology (Ultra-thick Al2O3 + TiCN multi-layer structure), the AC820P grade effectively eliminates crater wear, flank adhesion, and thermal fatigue at elevated surface speeds (Vc up to 300 m/min). Combined with the low-cutting-force UX Light-to-Medium Chipbreaker Geometry, this insert ensures smooth chip curling, minimal spindle load, and extended tool life during continuous roughing to semi-finishing operations.
2. Key Features
Utilizes ultra-thick, highly oriented Al2O3 and smooth TiCN crystal layers that reduce thermal conductivity, prevent cratering, and dramatically extend flank wear life under high-speed steel machining.
Significantly reduces passive radial cutting forces compared to 0.8mm radius inserts. Ideal for minimizing chatter on slender parts, thin-walled workpieces, or long tool overhang setups.
Specially curved rake angle with sharp cutting land curls steel chips effortlessly across light to medium depths of cut (ap 0.5–3.5 mm), preventing chip entanglement and workpiece scratching.
Negative 60° triangular structure ('N' hand) provides 6 fully usable, symmetrical cutting edges compatible with right-hand, left-hand, and neutral turning toolholders.
3. Specifications & ISO/ANSI Standardization
Understand every character in the TNMG160404N-UX AC820P designation:
| Technical Parameter | Metric Designation (ISO 1832) | Imperial Designation (ANSI B212.4) |
|---|---|---|
| Insert Model Code | TNMG160404N-UX | TNMG 331N-UX |
| Inscribed Circle Diameter (IC / d) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.187" (3/16") |
| Corner Radius (rε) | 0.4 mm | 0.016" (1/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150" |
| Cutting Edge Length (L) | 16.5 mm | 0.650" |
| Workpiece Material Sub-Group | Cutting Speed Vc (m/min) | Cutting Speed Vc (SFM) | Feed Rate f (mm/rev | IPR) | Depth of Cut ap (mm | in) |
|---|---|---|---|---|
| Unalloyed Carbon Steel (1045, 1020, S45C) | 180 – 320 m/min | 590 – 1050 SFM | 0.10 – 0.30 mm/r (.004–.012 IPR) | 0.5 – 3.5 mm (.020–.138 in) |
| Low Alloy Steel (4140, 4340, SCM440) | 150 – 280 m/min | 490 – 920 SFM | 0.08 – 0.28 mm/r (.003–.011 IPR) | 0.5 – 3.0 mm (.020–.118 in) |
| Forged & Mold Steel (P20, SKD61, H13) | 130 – 240 m/min | 425 – 780 SFM | 0.08 – 0.25 mm/r (.003–.010 IPR) | 0.5 – 2.5 mm (.020–.098 in) |
Due to its neutral hand ('N') construction, the TNMG160404N-UX insert fits seamlessly into Right-Hand (MTJNR / MTGNR), Left-Hand (MTJNL / MTGNL) external toolholders, and internal boring bars using 1604 / 331 negative pocket clamping.
📦 Find Matched MTJNR / MTJNL Turning Toolholders →4. Target Applications
- General Carbon & Alloy Steel Roughing to Semi-Finishing: High-efficiency turning of drive shafts, crankshafts, gears, transmission hubs, and hydraulic cylinders.
- Continuous to Light Interrupted Cutting: Performs reliably on shafts with keyways, cross-drilled oil holes, or non-uniform forged surfaces without premature edge fracturing.
- Low-Rigidity & Slender Part Machining: The combination of 0.4mm nose radius and UX low-resistance rake geometry minimizes deflection forces on long slender shafts and thin-walled tubes.
5. Compatibility
Fully compliant with ISO 5608 standard toolholder pocket clamping systems. Compatible across all major CNC machine platforms:
- CNC Machine Platforms: CNC Turning Lathes, Vertical Lathes (VTLs), Horizontal Turning Centers, Swiss-type CNCs (Haas, Mazak, Doosan/DN Solutions, Okuma, Mori Seiki, Citizen).
- Compatible Toolholder Series: MTJNR/L2020K16, MTJNR/L2525M16, MTGNR/L2525M16, WTJNR/L2525M16, and Boring Bars S32T-MTJNR16 / S32T-MTJNL16.
- Clamping Types: Lever-lock (M-type), Top-clamp with pin lock (W-type), and Screw-lock mechanisms.
6. Material & Grade Comparison Guide
| SUMITOMO Grade | Coating Technology | Primary Application Field | Key Performance Advantage |
|---|---|---|---|
| AC810P | CVD (Al2O3 + TiCN) | ISO P05 – P15 (High Speed Continuous) | Maximum wear resistance for high-speed continuous turning in clean cuts. |
| AC820P (Current) | Absotech Platinum CVD | ISO P10 – P25 (General Steel Turning) | First choice grade. Optimum balance of wear resistance, toughness, and versatility. |
| AC830P | Tough CVD (Al2O3 + TiCN) | ISO P25 – P40 (Heavy Interrupted Cuts) | Maximum fracture toughness engineered to withstand heavy shock loads and scale. |
7. Why Choose Us
Direct Factory Authorized Supply & Application Support
We deliver 100% genuine SUMITOMO Electric Hardmetal cutting tools directly from authorized global supply channels. Each 10-piece box comes sealed with original factory barcoding and batch traceability codes. Gain full access to our on-staff CNC application engineers for speed/feed optimization, chipbreaker pairing, and line troubleshooting.
"AC820P is our shop's default insert for 4140 steel turning. Edge life increased by nearly 35% compared to our previous supplier, and chip control with the UX breaker is flawless."
"Hervorragende Standzeit beim Drehen von C45 Stahwellen. Die Absotech Beschichtung hält extrem hohe Schnittgeschwindigkeiten ohne Freiflächenverschleiß aus."
"Ottima resistenza al consumo laterale su acciaio legato 39NiCrMo3. La raggio 0.4 annulla le vibrazioni sui pezzi lunghi."
"S45Cの旋削加工で安定した寿命を発揮します。UXチップブレーカの切りくず処理性が非常に良く、自動盤でのチョコ停が減りました。"
"Fast delivery and genuine SUMITOMO product. The 0.4mm nose radius is perfect for fine shoulder turning without chatter."
8. Frequently Asked Questions (AI & AEO Optimized)
A: AC820P is the primary "first-choice" general-purpose grade for ISO P10–P25 steel turning, offering maximum wear resistance at higher surface speeds. AC830P (ISO P25–P40) offers higher substrate toughness, making it better suited for severe interrupted cuts, severe scale, or unstable setups.
A: The UX chipbreaker is optimized for light-to-medium steel turning operations. Its low-cutting-force rake geometry reduces power consumption, curled chips smoothly, and prevents burrs across varying feed rates.
A: Choose a 0.4mm radius (04) when machining slender shafts, thin-walled workpieces, or long overhang setups where radial cutting forces can cause chatter. Choose 0.8mm (08) when higher edge strength for heavier roughing or higher feed rates is required.
A: Yes. TNMG 331N-UX is the exact ANSI imperial equivalent code for ISO metric TNMG160404N-UX. Both fit standard 3/8" inscribed circle toolholders.
9. Technical Resource & Troubleshooting Guide
ISO P (Steels & Alloy Steels): Carbon Steel, Alloy Steel, Tool Steel, Cast Steel (P10–P25) ★★★★★
ISO K (Cast Irons): Ductile Cast Iron / Nodular Iron Crossover ★★☆☆☆
ISO M / S (Stainless / Heat-Resistant Alloys): Conditional Application Only ★☆☆☆☆
| Tool Manufacturer | Equivalent Steel Turning Grade | Equivalent Chipbreaker Geometry |
|---|---|---|
| SUMITOMO | AC820P (Absotech Platinum CVD) | UX |
| Sandvik Coromant | GC4425 / GC4325 | PM / PS |
| Iscar | IC8250 / IC8150 | GN / M3P |
| Kennametal | KCP25B / KCU25 | MP / MS |
| Kyocera | CA825 / CA5525 | MU / C25 |
| Observed Tool Issue | Root Cause Analysis | Recommended Action / Adjustment |
|---|---|---|
| Rapid Flank Wear | Cutting speed Vc is too high for workpiece hardness. | Reduce cutting speed Vc by 10-15% or apply high-pressure flood coolant. |
| Crater Wear on Rake Face | Excessive cutting temperature during continuous dry cut. | Verify AC820P grade; increase coolant flow or switch to AC810P for extreme continuous speed. |
| Chipping / Fracture on Entry | Severe shock load on interrupted cuts or poor clamping. | Switch to tougher AC830P grade; reduce entrance feed rate by 20%. |
| Part Vibration / Surface Chatter | Excessive radial force or excessive tool overhang. | Maintain 0.4mm corner radius, increase feed rate slightly, or reduce depth of cut (ap). |
All geometrical dimensions, manufacturing tolerances, and ISO/ANSI classifications contained herein strictly comply with ISO 1832:2017 (Indexable inserts for cutting tools — Designation) and ANSI B212.4-2002 specifications. Technical cutting parameters and grade mechanical properties are derived directly from official Sumitomo Electric Hardmetal Corp. technical documentation (AC800P Series Steel Turning Catalog Vol. 2024/2025).
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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.
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