SUMITOMO TNMG160404N-EX AC630M Carbide Insert
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SUMITOMO TNMG160404N-EX AC630M Carbide Turning Insert (TNMG 331-EX)
Industrial-Grade ISO/ANSI Standard Negative Triangular PVD Coated Insert for Stainless Steel Machining
Which Carbide Insert Delivers the Highest Reliability in Stainless Steel Turning?
The SUMITOMO TNMG160404N-EX AC630M (ANSI counterpart: TNMG 331-EX) is the premier solution for machinists tackling severe work-hardening, heat accumulation, and notch wear in stainless steel turning. Powered by Sumitomo’s ultra-smooth Absotech / Super FX PVD coating technology, the AC630M grade combines exceptional thermal resistance with a micro-grained carbide substrate designed to eliminate sudden edge chipping during interrupted cuts.
Featuring the specialized double-sided EX chipbreaker geometry, this insert features an optimized sharp rake angle that drastically reduces cutting forces, prevents built-up edge (BUE), and delivers exceptional chip evacuation in light-to-medium finishing and semi-finishing operations on austenitic and duplex stainless steels.
Key Features & Performance Advantages
- Super FX PVD Coating Technology: Smooth Nano-TiAlN based multi-layer formulation suppresses notch wear and boundary welding on gummy materials.
- EX Chipbreaker Geometry: Ultra-sharp cutting edge profile minimizes cutting resistance, lowers machining temperature, and eliminates work-hardening layers.
- 6 Usable Cutting Edges: Double-sided 60° triangular negative design delivers high edge economy and lower cost per part.
- High Toughness Substrate: Engineered to withstand thermal shock and mechanical impacts in interrupted cuts and coolant-rich environments.
ISO / ANSI Standard Code Breakdown
ISO Code: TNMG 160404 N - EX | ANSI Code: TNMG 331 - EX
- 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
- EX: Chipbreaker Design — Sharp Low-Force Geometry for Stainless Finishing
Technical Specifications & Recommended Parameters
| Parameter Specification | Metric Standard (ISO) | Imperial Standard (ANSI) |
|---|---|---|
| Insert Model | TNMG160404N-EX | TNMG 331-EX |
| 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) | 80 - 200 m/min | 260 - 650 SFM |
| Feed Rate (fn) | 0.08 - 0.25 mm/rev | 0.003 - 0.010 ipr |
| Depth of Cut (ap) | 0.3 - 2.5 mm | 0.012 - 0.098 in |
Grade Performance Comparison: AC630M vs. Conventional Stainless Carbide
SUMITOMO AC630M (PVD Super FX)
- Ultra-smooth PVD surface prevents built-up edge and adhesion
- Extended resistance to boundary notch wear on 316L/Duplex
- High mechanical edge stability during interrupted cuts
Standard M20 PVD Carbide
- Prone to notch wear at depth-of-cut lines on stainless
- Higher friction coefficients lead to premature heat buildup
- Higher risk of edge chipping under varying cut depths
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 high-rigidity turning
Target Workpiece Applications
Primary choice for turning, facing, and profiling across tough stainless steels and heat-resistant alloys:
- Austenitic Stainless Steel (ISO M): AISI 304, 304L, 316, 316L, 321 (Finishing & light roughing)
- Duplex & Super Duplex (ISO M): 2205, 2507, S31803 (Low-force precision machining)
- Martensitic & Ferritic Stainless: 410, 420, 430 (Smooth, chip-controlled turning)
- Heat Resistant Super Alloys (ISO S): Inconel 718, Titanium alloys (Conditional light finishing)
CNC Machine & Equipment Compatibility
Fully compatible with all standard CNC turning lathes, horizontal turning centers, and multi-axis turning platforms. Integrates seamlessly 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) |
|---|---|---|---|
| M (Stainless Steel) | First Choice (Primary) | AC630M | GC2025 / KCU25 / IC6025 |
| P (Steel) | Secondary Choice | AC820P | GC4425 / KCP25B / IC8250 |
| S (Superalloys) | Conditional Choice | AC5015S | GC1105 / KMS15 / IC806 |
Troubleshooting & Process Optimization Guide
- Notch Wear at Cut Depth Line: Increase cutting speed (Vc) slightly or vary depth of cut (ap) across passes to redistribute thermal loading.
- Built-Up Edge (BUE): Increase cutting speed (Vc) and ensure high-pressure coolant is aimed directly at the cutting edge.
- Vibration / Chatter on Thin Parts: The sharp EX rake geometry minimizes force; ensure overhang is kept as short as possible.
Why Source From Us? Verified Global Customer Reviews
David K. — Precision Valves Lead (USA)
"Turning 316L stainless valve bodies was burning through standard carbide inserts. The AC630M grade with EX chipbreaker eliminated burrs and gave us double the tool life."
Markus S. — Workshop Owner (Germany)
"Excellent chip control on 1.4404 stainless steel. No long stringy ribbons wrapping around the spindle. Highly recommended."
Luca T. — Machining Supervisor (Italy)
"Low cutting force and very consistent wear. Original Sumitomo product delivered on time."
Takumi N. — CNC Specialist (Japan)
"AC630M is our standard grade for duplex stainless steel components. Exceptional surface finish and thermal stability."
Andrew P. — Manufacturing Buyer (UK)
"Authentic inserts with full batch traceability. Order arrived in London within 4 days."
Frequently Asked Questions (AI & Voice Search Optimized)
Q: What is the primary application for SUMITOMO TNMG160404N-EX AC630M?
A: It is engineered specifically for finishing to medium turning of stainless steel materials (ISO M15-M30), suppressing notch wear and edge adhesion.
Q: What is the ANSI equivalent designation for TNMG160404N-EX?
A: The exact ANSI standard cross-reference is TNMG 331-EX (3/8" inscribed circle, 3/16" thickness, 1/64" nose radius).
Q: How does the EX chipbreaker compare to the GE chipbreaker?
A: The EX chipbreaker has a sharper rake profile designed for lower cutting forces and finer finishing on gummy stainless steels, whereas the GE chipbreaker is a general-purpose geometry for steel turning across broader feed ranges.
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.