SUMITOMO TNMG160404N-UZ AC700G Cast Iron Turning Insert (TNMG 331N-UZ)
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SUMITOMO TNMG160404N-UZ AC700G Cast Iron Carbide Turning Insert (ANSI: TNMG 331N-UZ)
1. Product Overview
Which turning insert is best for bi-directional, neutral turning of ductile and gray cast irons where versatile chip control, micro-chipping resistance, and precise surface finish are critical?
The SUMITOMO TNMG160404N-UZ AC700G (ANSI designation TNMG 331N-UZ) is SUMITOMO's versatile, neutral-hand turning insert designed specifically for gray cast iron and ductile cast iron turning operations (ISO K10-K25 and steel crossover P10-P20). Featuring a neutral edge orientation ('N') combined with a precision 0.4mm (1/64") corner radius, this insert accommodates bi-directional turning, face-turning, and profiling operations on both left-hand and right-hand toolholders without edge conflict.
Utilizing SUMITOMO's proprietary Super FF CVD Coating Technology (Al2O3 + TiCN multi-layer) on an ultra-hard, deformation-resistant carbide substrate, the AC700G grade suppresses coating delamination, thermal fatigue cracks, and abrasive flank wear during high-speed iron processing. Integrated with the low-cutting-force UZ Light-Medium Chipbreaker Geometry, it delivers exceptional chip curling, low spindle load, and chatter suppression on light-to-medium cut depths (ap up to 3.5 mm).
2. Key Features
Features ultra-dense, highly textured Al2O3 and TiCN crystalline layers engineered to stop coating peeling, adhesion, and abrasive flank wear in cast iron machining.
Minimizes cutting pressure and lateral force on low-rigidity setups, yielding smooth surface finishes on thin-walled casting housings and tight shoulders.
Incorporate a curved rake face and positive cutting edge design that lowers horsepower demand and smoothly curls ductile iron chips across light-to-medium feeds.
Double-sided negative 60° triangular design ('N' hand) provides 6 fully symmetrical cutting corners, compatible with both right-hand and left-hand 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-UZ | TNMG 331N-UZ |
| 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) |
|---|---|---|---|
| Ductile Cast Iron (FCD450, FCD600, 65-45-12) | 180 - 330 m/min (600 - 1080 SFM) | 0.08 - 0.28 mm/rev (.003 - .011 IPR) | 0.5 - 3.5 mm (.020 - .138 in) |
| Gray Cast Iron (FC250, FC300, Class 35) | 160 - 320 m/min (520 - 1050 SFM) | 0.08 - 0.25 mm/rev (.003 - .010 IPR) | 0.5 - 3.0 mm (.020 - .118 in) |
| Carbon & Alloy Steels (P10-P20 Crossover) | 150 - 260 m/min (490 - 850 SFM) | 0.08 - 0.22 mm/rev (.003 - .009 IPR) | 0.5 - 2.5 mm (.020 - .098 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
- Bi-Directional Turning & Profiling: Machining complex contours, internal bores, and face steps in cast iron components using neutral toolholders.
- Light-to-Medium Cast Iron Machining: Precision turning of brake rotors, gearbox housings, bearing sleeves, and pump bodies.
- Low-Rigidity & Small Radius Operations: Machining thin-walled cast iron parts where the 0.4mm corner radius and UZ chipbreaker eliminate 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 |
|---|---|---|---|
| AC700G (Current) | Cast Iron Super FF CVD | ISO K10-K25 & P10-P20 Crossover | Versatile grade; suppresses micro-chipping and delamination in ductile/gray iron. |
| ACK15 / AC4010K | High-Speed Cast Iron CVD | ISO K05-K15 / Continuous Finishing | Ultra-high abrasive wear resistance for dry continuous cast iron turning. |
| ACK30 / AC4025K | Tough Cast Iron CVD | ISO K25-K35 / Heavy Interrupted Turning | Maximum shock toughness against severe mechanical impacts and heavy scale. |
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.
"The neutral hand ('N') design gave us flexibility across left and right turning setups on our Mazak CNC. Great tool life on ductile iron."
"Der UZ-Spanbrecher erzeugt hervorragende Oberflächengüten bei Grauguss. Keine Vibrationen bei dünnwandigen Teilen."
"Ottima resistenza all'usura su ghisa sferoidale FCD600. Il raggio 0.4 mm funziona perfettamente per gole strette."
"ダクタイル鋳鉄の仕上げ～中切削で非常に安定しています。UZ槽の切りくず分断性が良い。"
"Switched from HM to UZ for lower cutting force on thin cast sleeves. Instant reduction in chatter marks."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: TNMG160404R-HM has a dedicated right-hand edge orientation with an HM heavy-medium chipbreaker for higher feed rates, while TNMG160404N-UZ features a neutral edge orientation ('N') usable on both hand toolholders and a low-resistance UZ chipbreaker suited for lighter cuts and smoother finishes.
A: AC700G uses SUMITOMO's Super FF CVD coating technology (thick Al2O3 and TiCN), which resists abrasive wear caused by free graphite and sand inclusions while preventing coating delamination under thermal cycling.
A: A smaller 0.4mm nose radius generates lower passive radial forces, preventing part chatter and radial deflection on thin-walled cast housings and tight internal shoulder profiles.
A: Yes. TNMG 331N-UZ is the ANSI imperial designation for the ISO metric model TNMG160404N-UZ (3/8" Inscribed Circle, 3/16" Thickness, 1/64" Corner Radius).
9. Technical Resource & Troubleshooting Guide
ISO K (Primary): Gray Cast Iron, Ductile Cast Iron, Nodular Iron (FC, FCD) ★★★★★
ISO P (Secondary): Carbon Steels, Medium Alloy Steel Crossover (P10-P20) ★★★★☆
ISO M / S: Conditional / Non-Primary Application ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC700G (Super FF Cast Iron CVD) | UZ |
| Sandvik Coromant | GC3225 / GC3215 | KM / KF |
| Iscar | IC5010 / IC807 | GN / SF |
| Kennametal | KCK15B / KCK20 | MP / FP |
| Kyocera | CA315 / CA320 | C25 / GF |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Coating Delamination / Flaking | Excessive thermal stress or improper coolant application during heavy interrupted cuts. | Verify AC700G grade is in use; maintain steady coolant flow or switch to dry machining if thermal cracking occurs. |
| Edge Micro-Chipping on Hard Skin | Feed rate too high when engaging rough outer casting scale. | Reduce feed rate by 15-20% on initial cut pass; transition to heavy breaker if depth of cut exceeds 3.5 mm. |
| Rapid Abrasive Flank Wear | Cutting speed too high for high-silicon cast iron alloys. | Lower surface speed (Vc) by 10-15% or optimize coolant distribution. |
| Workpiece Chatter / Finish Defect | Radial tool force exceeding component wall stiffness. | Maintain 0.4mm corner radius, decrease depth of cut (ap), and verify tool 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 (AC700G Series Cast Iron Turning Technical Data Sheet).
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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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