SUMITOMO TNMG160404R-HM AC810P Steel Turning Insert (TNMG 331R-HM)
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SUMITOMO TNMG160404R-HM AC810P High-Speed Carbide Turning Insert (ANSI: TNMG 331R-HM)
1. Product Overview
Which turning insert is best for high-speed continuous steel turning requiring maximum crater wear resistance, a fine 0.4mm corner radius, and high thermal stability on carbon and alloy steels?
The SUMITOMO TNMG160404R-HM AC810P (ANSI designation TNMG 331R-HM) is SUMITOMO's premium high-speed CVD turning insert engineered for continuous to light-interrupted steel finishing and medium turning (ISO P05-P15). Featuring a right-hand/directional cutting edge orientation ('R') combined with a precision 0.4mm (1/64") corner radius, this insert minimizes cutting force, prevents vibration on long slender shafts, and produces exceptionally tight corner undercuts.
Utilizing SUMITOMO's advanced Absotech Platinum CVD Coating Technology, the AC810P grade applies an ultra-dense, highly crystal-oriented Al2O3 layer over a smooth, high-hardness TiCN layer. This combination provides supreme resistance against crater wear and plastic deformation at elevated surface cutting speeds (Vc up to 450 m/min). Integrated with the HM Heavy-Medium Chipbreaker Geometry, it delivers dependable chip breaking and low radial force across medium depth-of-cut ranges without sacrificing edge integrity.
2. Key Features
Features an ultra-thick, highly oriented Al2O3 and dense TiCN coating layer designed to withstand extreme thermal heat generation during continuous high-speed steel machining.
Dramatically reduces cutting resistance and component deflection on low-rigidity setups, yielding superior surface finishes on precision shafts and tight shoulders.
Integrates a reinforced cutting edge with a wide chip-evacuation rake zone, providing smooth chip curling and control over medium depth-of-cut parameters.
Double-sided negative 60° triangular design yields 6 sharp, long-lasting cutting edges per insert, reducing tool cost per finished component.
3. Specifications & ISO/ANSI Breakdown
Understanding the standardized code structure for exact product selection:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160404R-HM | TNMG 331R-HM |
| 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, A36) | 220 - 450 m/min (720 - 1470 SFM) | 0.12 - 0.35 mm/rev (.005 - .014 IPR) | 0.8 - 4.5 mm (.031 - .177 in) |
| Alloy Steels (4140, 4340, 8620) | 180 - 380 m/min (590 - 1250 SFM) | 0.10 - 0.30 mm/rev (.004 - .012 IPR) | 0.8 - 4.0 mm (.031 - .157 in) |
| Tool Steels / Cast Steel (P20, D2 annealed) | 150 - 280 m/min (490 - 920 SFM) | 0.10 - 0.25 mm/rev (.004 - .010 IPR) | 0.8 - 3.5 mm (.031 - .138 in) |
Fits all standard ISO/ANSI MTJNR, MTGNR, or WTJNR right-hand external turning toolholders and MTFNR boring bars taking 1604 / 331 size negative inserts with top and hole clamping.
Browse Compatible Right-Hand Toolholders (MTJNR) →4. Target Applications
- High-Speed Automated Lathe Operations: Perfect for mass production continuous turning cycles where high surface speed reduces cycle times.
- Slender Shaft & Thin-Wall Turning: Low cutting pressure from the 0.4mm nose radius eliminates deflection on delicate, long-length workpieces.
- High-Finish Steel Machining: Generates excellent surface micro-finishes on carbon and alloy steel shafts, sleeves, and precision flanges.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: High-Speed CNC Lathes, CNC Turning Centers, Automatic Lathes, and Multi-Tasking CNCs.
- Standard Toolholders: MTJNR2020K16, MTJNR2525M16, MTGNR2525M16, WTJNR2525M16, and internal boring bars such as S32T-MTJNR16.
- Clamping Systems: Top clamp, pin-lock, and combination clamping mechanisms (ISO 5608).
6. Material & Grade Comparison
| SUMITOMO Grade | Material Class | Primary Application Field | Key Characteristics |
|---|---|---|---|
| AC810P (Current) | High-Speed Steel CVD | ISO P05-P15 / Continuous Turning & High-Speed Finishing | Maximum wear resistance and high heat tolerance; best for fast cycle times. |
| AC820P | General Steel CVD | ISO P10-P25 / First-Choice General Purpose Turning | Balanced wear resistance and toughness for versatile medium cuts. |
| AC830P | Tough Steel CVD | ISO P25-P35 / Heavy Roughing & Heavy Interrupted Cut | Maximum fracture toughness against severe mechanical shock. |
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 anti-counterfeiting tracking codes. Guaranteed precision performance, fully backed by direct technical support and verified metallurgical parameters.
"Switched to AC810P for continuous high-speed turning on 1045 steel shafts. The wear life at high Vc is incredible compared to standard general grades."
"Hervorragende Standzeit bei hohen Schnittgeschwindigkeiten. Der R0.4 Radius erzeugt eine fantastische Oberflächengüte."
"Prestazioni eccellenti nei tagli continui ad alta velocità su 42CrMo4. Molto soddisfacente."
"高速切削での耐摩耗性が非常に高いです。R-HMブレーカと0.4ラジアスの相性も良く、細物加工の倒れを抑制できます。"
"Clean chip flow and zero flank wear after long production runs on alloy steel bars."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC810P is optimized for high-speed continuous machining (ISO P05-P15) where maximum wear resistance and thermal stability are required. AC820P is a general-purpose grade (ISO P10-P25) offering a broader balance between wear resistance and toughness for general cutting conditions.
A: A 0.4mm corner radius reduces radial tool force significantly, making it superior for thin-walled components, slender shafts susceptible to flex, and machining sharp 90-degree undercut shoulders.
A: No. AC810P is engineered primarily for high-speed continuous cuts to light interruptions. For heavy interrupted cuts or severe mechanical shocks, SUMITOMO AC830P grade is recommended.
A: Yes. TNMG 331R-HM is the ANSI imperial designation for the ISO metric code TNMG160404R-HM. Both specify a 3/8" (9.525mm) inscribed circle, 3/16" (4.76mm) thickness, and 1/64" (0.4mm) corner radius.
9. Technical Resource & Troubleshooting Guide
ISO P (Primary): Carbon Steel, Alloy Steel, Cast Steel, Tool Steel ★★★★★
ISO K (Secondary): High-Strength Ductile Iron ★★★☆☆
ISO M / S: Conditional / Non-Primary Application ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC810P (High-Speed Steel CVD) | HM |
| Sandvik Coromant | GC4415 / GC4315 | HM / PM |
| Iscar | IC8150 / IC807 | M3P / GN |
| Kennametal | KCP10B / KCP10 | MP / RP |
| Kyocera | CA515 / CA510 | MU / PH |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Edge Micro-Chipping / Mechanical Shock Fracture | Grade used in heavy interrupted cuts or setup rigidity is insufficient. | Switch from AC810P to AC820P / AC830P grade or check workpiece clamping rigidity. |
| Workpiece Chatter / Radial Deflection | Feed rate too high or depth of cut exceeds shaft rigidity. | Maintain 0.4mm nose radius, reduce depth of cut (ap), or adjust feed rate. |
| Thermal Wear / Rapid Flank Wear | Cutting speed exceeds AC810P maximum parameter or insufficient coolant. | Verify cutting speed is within 220-450 m/min window and ensure high-pressure flood coolant delivery. |
| Long Ribbon Chips / Poor Chip Evacuation | Feed rate or depth of cut below HM chipbreaker activation range. | Increase feed rate above 0.12 mm/rev or increase depth of cut above 0.8 mm. |
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 (AC8000P Series Steel Turning Grade Technical Manual).
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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.