SUMITOMO TNMG160404N-UX AC830P Steel Turning Carbide Insert (TNMG 331N-UX)
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SUMITOMO TNMG160404N-UX AC830P Steel Turning Carbide Insert (ANSI: TNMG 331N-UX)
1. Product Overview
Which turning insert is best suited for heavy steel turning and heavy interrupted cuts where chipping, edge fracturing, and thermal cracking are major risks?
The SUMITOMO TNMG160404N-UX AC830P (ANSI designation TNMG 331N-UX) is SUMITOMO's ultra-tough, heavy-duty steel turning grade engineered for general carbon steels, alloy steels, and forged components operating under severe machining conditions (ISO P25-P40 range). Featuring a neutral edge orientation ('N') paired with a precision 0.4mm (1/64") corner radius, this insert delivers outstanding chip breaker flexibility across both right-hand and left-hand toolholders while suppressing vibration on thin-walled or long-overhang setups.
Utilizing SUMITOMO's proprietary Absotech Platinum CVD Coating Technology (Ultra-thick Al2O3 + TiCN multi-layer) applied over an ultra-tough, crack-resistant carbide matrix, the AC830P grade exhibits exceptional fracture toughness and crater wear resistance under heavy shock loads. Integrated with the low-cutting-force UX Light-Medium Chipbreaker Geometry, it provides smooth chip curl and low edge-load characteristics across medium depths of cut (ap up to 3.5 mm).
2. Key Features
Features ultra-thick nanostructured Al2O3 and TiCN crystal layers engineered to prevent crater wear, thermal cracking, and catastrophic edge breakage during heavy interrupted cuts.
Reduces passive radial forces and tool-workpiece contact pressure, suppressing chatter on slender components while maintaining precise profile tolerances.
Incorporate a curved rake wall and sharp cutting land designed to curl tough steel chips smoothly, reducing spindle power requirements on medium machining passes.
Double-sided negative 60° triangular architecture ('N' hand) provides 6 fully symmetrical cutting edges compatible with right-hand, left-hand, and boring toolholders.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code breakdown for accurate tooling identification:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160404N-UX | TNMG 331N-UX |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.187" (3/16") |
| Corner Radius (r) | 0.4 mm | 0.016" (1/64") |
| Hole Diameter (d1) | 3.81 mm | 0.150" |
| Cutting Edge Length (L) | 16.5 mm | 0.650" |
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (f) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steels (1045, 1020, S45C) | 140 - 280 m/min (460 - 920 SFM) | 0.08 - 0.28 mm/rev (.003 - .011 IPR) | 0.5 - 3.5 mm (.020 - .138 in) |
| Alloy Steels (4140, 4340, SCM440) | 120 - 240 m/min (390 - 790 SFM) | 0.08 - 0.25 mm/rev (.003 - .010 IPR) | 0.5 - 3.0 mm (.020 - .118 in) |
| Forged Steel & Heavy Interrupted Cuts | 100 - 200 m/min (330 - 650 SFM) | 0.10 - 0.25 mm/rev (.004 - .010 IPR) | 0.8 - 3.0 mm (.031 - .118 in) |
Neutral hand design fits both Right-Hand (MTJNR / MTGNR) and Left-Hand (MTJNL / MTGNL) external turning toolholders as well as boring bars taking 1604 / 331 size negative inserts.
Browse Neutral & Right/Left Turning Toolholders →4. Target Applications
- Heavy Interrupted Turning: Machining forged steel shafts, splined components, hex bar stock, and parts with keyways or cross-holes.
- General Carbon & Alloy Steel Turning: Roughing and semi-finishing of drive shafts, gears, flange hubs, and structural steel components.
- Low-Rigidity & Profiling Cuts: Turning slender steel parts where the 0.4mm corner radius and UX chipbreaker prevent deflection and chatter.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: CNC Turning Lathes, Vertical Lathes (VTLs), Horizontal Turning Centers, and Swiss-Type CNC Lathes (Haas, Mazak, Doosan/DN Solutions, Okuma, Mori Seiki).
- Standard Toolholders: MTJNR/L2020K16, MTJNR/L2525M16, MTGNR/L2525M16, WTJNR/L2525M16, and boring bars such as S32T-MTJNR16 / S32T-MTJNL16.
- Clamping Systems: Top clamp, pin-lock, and combination clamping mechanisms conforming to ISO 5608.
6. Material & Grade Comparison
| SUMITOMO Grade | Material Class | Primary Application Field | Key Characteristics |
|---|---|---|---|
| AC810P | High-Speed Steel CVD | ISO P05-P15 (Continuous Finishing) | Maximum wear resistance for high-speed continuous steel turning. |
| AC820P | General Steel CVD | ISO P10-P25 (General Machining) | Optimal balance of wear resistance and edge toughness for general steel operations. |
| AC830P (Current) | Tough Steel CVD | ISO P25-P40 (Interrupted Cuts / Heavy Roughing) | Maximum fracture toughness against severe impacts, scale, and heavy interrupted cuts. |
7. Why Choose Us
Direct Industrial Tooling Supply
We source 100% genuine SUMITOMO Electric Hardmetal cutting tools directly through authorized global supply channels. Every box features original factory tracking codes. Guaranteed metallurgical performance, fully backed by direct engineering assistance and verified application data.
"AC830P solved our insert breakage issues when turning forged 4140 splined shafts. Excellent toughness on heavy interrupted cuts."
"Sehr hohe Bruchzähigkeit bei stark unterbrochenem Schnitt. Keine Kantenausbrüche mehr bei Stahlguss."
"Grande resistenza agli urti su alberi scanalati in acciaio legato. Il rompichip UX funziona benissimo."
"断続切削での耐摩耗性と耐欠損性が非常に優れたグレードです。AC830Pの安心感は高い。"
"Replaced standard inserts with AC830P for turning forged flanges. Tool life doubled per cutting corner."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC830P combines SUMITOMO's Absotech Platinum CVD coating (thick Al2O3 + TiCN) with a high-toughness, crack-inhibiting carbide substrate, preventing micro-chipping and edge thermal fatigue caused by mechanical impacts during interrupted cuts.
A: The UX chipbreaker features a low-cutting-force rake geometry that smoothly curls tough steel chips while keeping cutting loads low, making it ideal for light-to-medium depths of cut and lower-rigidity machines.
A: A smaller 0.4mm nose radius reduces passive radial cutting forces, preventing part chatter and chatter marks on slender shafts, thin walls, or long overhang setups.
A: Yes. TNMG 331N-UX is the ANSI imperial code for the ISO metric designation TNMG160404N-UX (3/8" Inscribed Circle, 3/16" Thickness, 1/64" Corner Radius).
9. Technical Resource & Troubleshooting Guide
ISO P (Primary): Carbon Steels, Alloy Steels, Structural Steels, Forged Steels (P25-P40) ★★★★★
ISO K (Secondary): High-Strength Ductile Irons Crossover ★★★☆☆
ISO M / S: Conditional / Non-Primary Application ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC830P (Absotech Platinum CVD) | UX |
| Sandvik Coromant | GC4335 / GC4235 | PM / PR |
| Iscar | IC830 / IC8250 | M3P / GN |
| Kennametal | KCP30B / KCP40 | MP / RP |
| Kyocera | CA830 / CA825 | C25 / MU |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Edge Micro-Chipping on Interrupted Cuts | Excessive shock load or feed rate during keyway entry. | Verify AC830P grade is selected; reduce feed rate by 15-20% at point of entrance/exit. |
| Rapid Crater Wear | Cutting speed too high for carbon steel grade, generating extreme heat. | Lower surface speed (Vc) by 10-15% or ensure high-pressure coolant is applied directly to rake face. |
| Thermal Cracking / Comb Cracks | Intermittent coolant delivery causing severe thermal cycling. | Provide consistent high-flow coolant or switch to dry cutting under high-speed interrupted conditions. |
| Workpiece Vibration / Chatter | High passive radial force on slender shaft parts. | Keep 0.4mm corner radius insert, reduce depth of cut (ap), and inspect clamping overhang rigidity. |
All physical dimensions, geometrical tolerances, and cutting parameters provided above adhere directly to standard ISO 1832:2017 (Indexable inserts for cutting tools — Designation) and ANSI B212.4-2002 specifications. Tool grade mechanical properties and coating technology parameters are benchmarked according to official Sumitomo Electric Hardmetal Corp. technical catalog specifications (AC800P Series Steel Turning Technical Data Sheet).
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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
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.