Sumitomo TNMG160404N-SU AC830P Carbide Insert (TNMG 331-SU)
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Sumitomo TNMG160404N-SU AC830P Carbide Insert | ISO TNMG 160404-SU (ANSI TNMG 331-SU)
1. Product Overview
Which turning insert is best for low-resistance light steel cutting, thin-walled workpieces, and heavy interrupted turning?
The Sumitomo TNMG160404N-SU AC830P (ANSI Designation: TNMG 331-SU) is a double-sided 60° triangular carbide indexable turning insert engineered for low cutting resistance and high-toughness steel machining. Built with Sumitomo’s tough AC830P CVD Coating grade, it features an advanced multi-layer Al2O3 and TiCN coating structure over a shock-resistant carbide substrate. This grade delivers superior resistance to edge chipping, mechanical shock, and thermal fatigue during interrupted cuts on ISO P20–P40 carbon steels, alloy steels, and forgings.
Featuring the specialized SU Low Resistance / Light Cutting Chipbreaker geometry, this insert is designed with a high rake angle and sharp cutting edge to minimize cutting force and chatter. It excels on low-rigidity setups, long slender shafts, thin-walled workpieces, and shallow depths of cut (ap: 0.3mm to 2.5mm) at feed rates (fn: 0.08mm to 0.25mm), ensuring smooth chip evacuation without workpiece deflection.
2. Key Features & Industrial Performance
- 6 Economy Cutting Edges: Double-sided negative 60° geometry offers lower tooling costs per edge for high-volume steel lathe turning.
- AC830P CVD Tough Coating Grade: High-impact multi-layer Al2O3/TiCN structure built to survive interrupted cuts and heavy vibration.
- SU Ultra-Low Resistance Chipbreaker: High positive inclination angle minimizes cutting forces, preventing burrs, workpiece chatter, and thin-wall deflection.
- Dual ISO / ANSI Standard Compliance: Fully compliant with ISO 1832 and ANSI B212.4 worldwide toolholder standards.
- Precision 0.4 mm (1/64") Radius: Delivers exceptional dimensional stability, low radial thrust force, and clean surface finishes.
ISO / ANSI Code Breakdown Specification
Detailed architectural breakdown of the TNMG160404N-SU specification code:
3. Technical Specifications & Recommended Cutting Parameters
| Specification Parameter | Metric Value (ISO Standard) | Imperial Value (ANSI Standard) |
|---|---|---|
| Product Designation | TNMG160404N-SU AC830P | TNMG 331-SU AC830P |
| Inscribed Circle (i.C.) | 10.0 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (re) | 0.4 mm | 0.0156" (1/64") |
| Hole Diameter (d1) | 3.81 mm | 0.150" |
| Insert Substrate Grade | Sumitomo AC830P (CVD TiCN/Al2O3) | Sumitomo AC830P (CVD TiCN/Al2O3) |
Recommended Speeds and Feeds (Dual Unit Reference Table)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO P: Alloy Steel / Forged Steel | 120 - 230 m/min (390 - 755 SFM) |
0.08 - 0.25 mm/rev (0.003 - 0.010 IPR) |
0.3 - 2.5 mm (0.012 - 0.098 in) |
| ISO P: Carbon Steel / Mild Steel | 140 - 260 m/min (460 - 850 SFM) |
0.08 - 0.22 mm/rev (0.003 - 0.009 IPR) |
0.3 - 2.0 mm (0.012 - 0.079 in) |
| ISO K: Ductile Iron / Nodular Iron | 120 - 220 m/min (390 - 720 SFM) |
0.10 - 0.22 mm/rev (0.004 - 0.009 IPR) |
0.5 - 2.0 mm (0.020 - 0.079 in) |
This insert fits all standard ISO/ANSI double-clamp, lever-clamp, and top-clamp turning toolholders with a 60° triangular pocket:
MTJNR / MTJNL 2020K16 MTJNR / MTJNL 2525M16 WTJNR / WTJNL 2020K16 DTJNR / DTJNL 2525M16 Boring Bar: S25S-MTJNR164. Applications & Target Workpiece Materials
- Thin-Walled Tubes & Bushings: Sharp shearing geometry prevents radial pressure and component deformation.
- Long Slender Shaft Turning: Low cutting force profile eliminates chatter on parts with high length-to-diameter ratios.
- Light Interrupted Cuts: Ideal for finishing operations across keyways, splines, and cross-holes in alloy steels.
5. Compatibility & Equipment Integration
Fully compatible with all standard CNC lathes, Swiss-type automatic lathes, vertical VTLs, and manual engine lathes using ISO-standard toolholders. Direct drop-in fit for toolholding systems from Sandvik Coromant, Kennametal, Iscar, Kyocera, Tungaloy, Walter, and Seco.
6. Grade Comparison & Equivalents Matrix
| Brand | Equivalent Grade | Equivalent Chipbreaker | ISO Classification Range |
|---|---|---|---|
| Sumitomo Electric | AC830P | SU | ISO P20-P40 |
| Sandvik Coromant | GC4335 / GC4235 | LC / L-K | ISO P25-P40 |
| Kennametal | KCP30 / KCP40 | LF / FN | ISO P25-P40 |
| Iscar | IC830 / IC8250 | SF / F3P | ISO P25-P40 |
| Kyocera | CA530 / CA525 | VF / PP | ISO P25-P35 |
7. Why Source Sumitomo Inserts From Us?
- 100% Guaranteed Factory Original: Direct authorization channels eliminate grey-market and counterfeit tooling risks.
- Strict Batch Traceability: Fully compliant with ISO 9001 factory inspection standards with verified material certs.
- Express Global Dispatch: Optimized order processing and safe, vacuum-sealed industrial packaging.
Global Verified Machinist Reviews
Perfect for slender steel shafts
"The SU chipbreaker is a game changer for low rigidity setups. Zero chatter on long 4140 shafts and chip breaking is super clean even at light depth of cut."
— Robert L., CNC Turning Specialist (United States 🇺🇸)Geringer Schnittdruck und hervorragende Standzeit
"Ideal für dünnwandige Stahlrohre. Kein Verformen des Werkstücks und die AC830P-Sorte hält unterbrochene Schnitte problemlos aus."
— Stefan K., Fertigungstechnik (Germany 🇩🇪)Ottimo per basse forze di taglio
"Rompitruciolo SU fantastico su tagli leggeri e pezzi flessibili. Nessuna vibrazione e finitura superficiale eccellente."
— Luca M., Capo Reparto CNC (Italy 🇮🇹)低抵抗で細長ワークの加工に最適
"SUブレーカの切れ味が良く、びびりが発生しやすい薄肉部品でも安定して削れます。AC830Pの耐久性も抜群です。"
— Kenichi Y., Lead Machinist (Japan 🇯🇵)Clean finish on interrupted light cuts
"Holds tight tolerances across splined shafts without edge breakdown."
— David W., Production Engineer (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice-Search Optimized)
Machining Troubleshooting & Optimization Guide
| Problem / Wear Pattern | Probable Cause | Corrective Action |
|---|---|---|
| Workpiece Chatter / Vibration | Excessive radial force or tool overhang. | Verify SU breaker is engaged, reduce overhang, or slightly increase feed rate. |
| Uncontrolled Stringy Chips | Depth of cut (ap) or feed rate (fn) is below the SU breaker activation threshold. | Increase feed rate (fn) above 0.08 mm/rev or deepen cut slightly beyond 0.3 mm. |
| Rapid Crater Wear | Excessive cutting speed (Vc) generating extreme heat. | Reduce surface speed (Vc) by 15% and check high-pressure coolant direction. |
Need Help With Sumitomo Inserts?
Looking for a Sumitomo equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This Sumitomo insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
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.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.