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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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.
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