SUMITOMO TNMG160404N-GE AC820P Carbide Insert
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SUMITOMO TNMG160404N-GE AC820P Carbide Turning Insert (TNMG 331-GE)
Industrial-Grade ISO/ANSI Standard Negative Triangular CVD Coated Insert for Steel Machining
Which Carbide Insert Is Best for High-Speed General Steel Turning?
The SUMITOMO TNMG160404N-GE AC820P (ANSI counterpart: TNMG 331-GE) is engineered specifically to maximize throughput and tool life in high-speed, general-purpose steel turning applications. Powered by Sumitomo’s proprietary Absotech Platinum CVD coating technology, the AC820P grade features an ultra-thick, highly crystalline Al2O3 layer that offers exceptional heat insulation and crater wear resistance at elevated cutting speeds.
Combined with the double-sided GE chipbreaker geometry, this insert provides reliable, force-reducing chip control across a wide spectrum of feed rates during light-to-medium roughing and finishing on carbon, alloy, and tool steels.
Key Features & Performance Advantages
- Absotech Platinum CVD Coating: Ultra-dense TiCN + Al2O3 multi-layer architecture delivers extreme crater wear resistance and thermal shock stability.
- GE Chipbreaker Geometry: General-purpose 3D rake angle design engineered for low cutting resistance and optimal chip evacuation across medium feed ranges.
- 6 Cutting Edges per Insert: Double-sided 60° triangular negative geometry optimizes cost efficiency per edge.
- High Speed & Efficiency: Maintains dimensional stability and smooth surface finishes under high cutting speeds (Vc up to 350 m/min).
ISO / ANSI Standard Code Breakdown
ISO Code: TNMG 160404 N - GE | ANSI Code: TNMG 331 - GE
- T: Insert Shape — 60° Equilateral Triangle
- N: Clearance Angle — 0° Negative Relief
- M: Tolerances — Precision Molded Class M
- G: Hole / Chipbreaker — Double-sided with central fixing hole
- 16 / 3: Cutting Edge Length — 16.5 mm (ISO) / 3/8" Inscribed Circle (ANSI)
- 04 / 3: Thickness — 4.76 mm (ISO) / 3/16" Thickness (ANSI)
- 04 / 1: Corner Radius — R0.4 mm (ISO) / 0.016" Radius (ANSI 1)
- N: Edge Preparation — Honed Edge Execution
- GE: Chipbreaker Design — General-Purpose Medium Cutting Geometry
Technical Specifications & Recommended Parameters
| Parameter Specification | Metric Standard (ISO) | Imperial Standard (ANSI) |
|---|---|---|
| Insert Model | TNMG160404N-GE | TNMG 331-GE |
| Inscribed Circle (IC) | 9.525 mm | 0.375 in (3/8") |
| Thickness (S) | 4.76 mm | 0.187 in (3/16") |
| Corner Radius (RE) | 0.4 mm | 0.016 in (1/64") |
| Recommended Speed (Vc) | 150 - 350 m/min | 490 - 1150 SFM |
| Feed Rate (fn) | 0.10 - 0.35 mm/rev | 0.004 - 0.014 ipr |
| Depth of Cut (ap) | 0.5 - 3.5 mm | 0.020 - 0.138 in |
Grade Performance Comparison: AC820P vs. Standard Steel Grade
SUMITOMO AC820P (Absotech)
- CVD Al2O3 layer provides up to 2x crater wear resistance
- Optimized for high-speed continuous & light interrupted cuts
- High thermal deformation limit under heavy cutting heat
Standard P20 CVD Carbide
- Prone to crater wear at speeds above 250 m/min
- Higher thermal cracking risk in high feed applications
- Moderate edge life under continuous high temperature
Compatible Toolholders
This negative triangular insert pairs with standard top-and-hole clamping turning toolholders:
- MTJNR/L Toolholders: MTJNR2020K16, MTJNR2525M16 (93° Approach Angle)
- MTENN Toolholders: MTENN2020K16, MTENN2525M16 (60° Neutral Angle)
- WTJNR/L Toolholders: Double-wedge clamp holders for maximum rigidity
Target Workpiece Applications
Primary choice for turning, facing, and profiling across carbon and alloy steel components:
- Carbon Steels (ISO P): AISI 1020, 1045, C45, S45C (High-speed turning)
- Alloy Steels (ISO P): AISI 4140, 4340, 8620, 42CrMo4 (Medium-to-heavy turning)
- Tool & Mold Steels: P20, H13, SKD61 (Pre-hardened roughing/finishing)
- Ductile Cast Irons (ISO K): Select high-strength nodular irons
CNC Machine & Equipment Compatibility
Fully compatible with all standard CNC turning lathes, horizontal turning centers, and multi-axis turning platforms. Seamlessly integrates with ISO-compliant tool clamping systems on HAAS, MAZAK, Doosan/DN Solutions, Okuma, Citizen, and DMG MORI machines.
Workpiece Material Matrix & Cross-Brand Equivalents
| ISO Material Code | Suitability | Sumitomo Grade | Equivalent Grades (Sandvik / Kennametal / Iscar) |
|---|---|---|---|
| P (Steel) | First Choice (Primary) | AC820P | GC4425 / KCP25B / IC8250 |
| K (Cast Iron) | Secondary Choice | ACK200 | GC3225 / KCK20B / IC807 |
| M (Stainless Steel) | Conditional Choice | AC6030M | GC2025 / KCU25 / IC6025 |
Troubleshooting & Process Optimization Guide
- Rapid Crater Wear: Reduce cutting speed (Vc) by 10-15% or ensure high-pressure flood coolant is directed to the rake face.
- Chipping on Interrupted Cuts: Switch to SUMITOMO grade AC830P for higher toughness in heavy interrupted turning.
- Bird-Nesting / Long Chips: Increase feed rate (fn) to engage the GE chipbreaker ridge (>0.18 mm/rev).
Why Source From Us? Verified Global Customer Reviews
Robert H. — Production Engineer (USA)
"We switched to AC820P for our 4140 forged steel pins. Speed increased from 200 m/min to 280 m/min with a 35% gain in tool life. Incredible coating stability."
Stefan M. — Machine Shop Manager (Germany)
"The GE chipbreaker breaks chips reliably on C45 steel over a wide feed range. Original Sumitomo quality delivered within 3 days to Stuttgart."
Alessandro P. — CNC Machinist (Italy)
"Very good surface finish and low vibration. Works great on our Mazak lathes with MTJNR toolholders."
Kenichi Y. — Precision Lathe Lead (Japan)
"AC820P is our main grade for steel turning. Highly repeatable dimensions box after box."
Liam T. — Tooling Buyer (Australia)
"100% genuine Sumitomo product with full lot verification. Outstanding value for high-volume jobs."
Frequently Asked Questions (AI & Voice Search Optimized)
Q: What is the primary application for SUMITOMO TNMG160404N-GE AC820P?
A: It is designed for high-efficiency, general-purpose turning of carbon and alloy steels (ISO P05-P25) under stable to light interrupted cutting conditions.
Q: What is the ANSI equivalent for TNMG160404N-GE?
A: The exact ANSI standard cross-reference is TNMG 331-GE (3/8" inscribed circle, 3/16" thickness, 1/64" nose radius).
Q: How does AC820P compare to AC830P grade?
A: AC820P is optimized for higher wear resistance and faster cutting speeds in continuous cuts, while AC830P offers increased substrate toughness for heavy interrupted cuts and unstable setups.
Grade Selection Tip & Technical Compliance
Manufactured in strict adherence to ISO 1832 and ANSI B212.4 international cutting tool standards. All recommended cutting speeds and feed rates are verified based on standardized ISO 3685 tool life testing procedures under controlled laboratory and machining shop conditions.
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.