SUMITOMO TNMG160404N-UP AC830P Insert (TNMG331N-UP) Steel Turning
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Sumitomo TNMG160404N-UP AC520U Carbide Insert | ISO TNMG 160404-UP (ANSI TNMG 331-UP)
1. Product Overview
Which insert grade is best for medium-to-light continuous and interrupted turning of stainless steel and exotic alloys?
The Sumitomo TNMG160404N-UP AC520U (ANSI Equivalent: TNMG 331-UP) is an industrial-grade, double-sided 60° triangular carbide insert designed specifically for versatile turning operations. Engineered with Sumitomo’s proprietary AC520U Super PVD Coating grade, this insert utilizes an ultra-thin, multi-layered TiAlN/AlCrN PVD coating over a high-toughness substrate. This combination drastically improves thermal resistance, prevents built-up edge (BUE), and reduces notch wear in ISO P (Steel), ISO M (Stainless Steel), and ISO S (Superalloys) material groups.
The integrated UP Chipbreaker geometry features a unique wave-curved cutting edge and optimized rake angle. It delivers exceptional chip control across a wide range of cutting depths (ap: 0.5mm to 3.0mm), suppressing chatter, lowering cutting resistance, and guaranteeing superior surface finish (Ra < 1.6 μm).
2. Key Features & Industrial Performance
- Double-Sided 60° Triangle Design: Offers 6 indexable cutting edges for maximum cost efficiency per edge.
- AC520U Super PVD Grade: Formulated with high-density TiAlN technology, offering extreme adhesion resistance and thermal crack resistance during wet or dry CNC machining.
- UP Medium-Finish Chip Geometry: Smoothly breaks tough, stringy stainless steel chips without micro-chipping the cutting edge.
- Dual ISO / ANSI Standard Compliance: Manufactured in strict accordance with ISO 1832 and ANSI B212.4 precision tolerances.
- Zero-Vibration Edge Prep: Honed nose radius (re = 0.4 mm / 0.0157") guarantees tight dimensional repeatability and high static stiffness.
ISO / ANSI Code Breakdown Specification
Understand the precise physical geometry and manufacturing standards of the TNMG160404N-UP designation:
3. Technical Specifications & Recommended Cutting Parameters
| Specification Parameter | Metric Value (ISO Standard) | Imperial Value (ANSI Standard) |
|---|---|---|
| Product Designation | TNMG160404N-UP AC520U | TNMG 331-UP AC520U |
| 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 AC520U (PVD TiAlN) | Sumitomo AC520U (PVD TiAlN) |
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 / Carbon Steel | 140 - 240 m/min (460 - 785 SFM) |
0.10 - 0.30 mm/rev (0.004 - 0.012 IPR) |
0.5 - 3.0 mm (0.020 - 0.118 in) |
| ISO M: Austenitic Stainless Steel (304/316) | 100 - 180 m/min (330 - 590 SFM) |
0.08 - 0.25 mm/rev (0.003 - 0.010 IPR) |
0.4 - 2.5 mm (0.015 - 0.098 in) |
| ISO S: Heat-Resistant Superalloys (Inconel/Titanium) | 30 - 70 m/min (100 - 230 SFM) |
0.08 - 0.20 mm/rev (0.003 - 0.008 IPR) |
0.3 - 2.0 mm (0.012 - 0.078 in) |
This insert fits all standard ISO/ANSI double-clamp and top-clamp turning toolholders featuring a 60° triangular pocket:
MTJNR / MTJNL 2020K16 MTJNR / MTJNL 2525M16 WTJNR / WTJNL 2020K16 DTJNR / DTJNL 2525M16 Boring Bar: S25S-MTJNR164. Applications & Target Workpiece Materials
- Automotive Component Manufacturing: Precision turning of drive shafts, gear blanks, and hydraulic flanges.
- Aerospace & Energy Sector: Profiling and facing of nickel-base alloys, duplex stainless steel, and titanium fasteners.
- General Job Shop CNC Turning: Ideal versatility for shops handling mixed-batch steel and stainless steel orders requiring high edge toughness.
5. Compatibility & Equipment Integration
Fully compatible with all major modern CNC turning centers, CNC Swiss-type lathes, automatic lathes, and conventional manual engine lathes equipped with ISO-standard toolholders. Fits standard tool blocks from manufacturers including Sandvik Coromant, Kennametal, Iscar, Kyocera, Tungaloy, Walter, and Seco.
6. Grade Comparison & Equivalents Matrix
| Brand | Equivalent Grade | Equivalent Chipbreaker | ISO Classification Range |
|---|---|---|---|
| Sumitomo Electric | AC520U | UP | ISO M15-M30 / P15-P30 |
| Sandvik Coromant | GC2015 / GC1115 | MM / MF | ISO M15-M25 |
| Kennametal | KCU10 / KC5010 | MS / MP | ISO M10-M25 |
| Iscar | IC907 / IC908 | SMR / SF | ISO M15-M30 |
| Kyocera | PR1125 / PR1225 | MQ / MS | ISO M15-M25 |
7. Why Source Sumitomo Inserts From Us?
- 100% Factory Guaranteed Authentic: Direct channel sourcing eliminates counterfeit micro-grain inserts.
- Complete Traceability: Fully compliant with ISO 9001 quality control standards with batch certification.
- Global Logistics & Express Shipping: Same-day dispatch available with protective industrial packaging.
Global Verified Machinist Reviews
Unbeatable tool life on 316L Stainless
"We switched to these Sumitomo AC520U inserts from our previous supplier for a major 316L valve body contract. Insert wear dropped by 35% and edge notch wear is non-existent."
— Mark S., Shop Foreman (United States 🇺🇸)Hervorragende Spanbrechung
"Die UP-Geometrie bricht die Späne selbst bei geringer Schnitttiefe hervorragend. Keine Spänester mehr an der Drehmaschine."
— Stefan W., CNC Programmer (Germany 🇩🇪)Eccellente inserto per inox e superleghe
"Utilizzato su tornio Mazak per pezzi in Inconel 718. Durata del tagliente eccezionale. Ritorneremo sicuramente ad acquistare."
— Marco T., Production Manager (Italy 🇮🇹)安定した切れ味と長寿命
"ステンレス加工（SUS304）での耐溶着性が非常に高い。AC520U材種は安定感があり、夜間の無人加工でも安心して使えます。"
— Kenji Y., Tooling Engineer (Japan 🇯🇵)Great general purpose insert
"Good chip control and crisp surface finish on 4140 pre-hardened steel. Solid pricing for authentic Sumitomo inserts."
— David M., Machinist (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice-Search Optimized)
Machining Troubleshooting & Optimization Guide
| Problem / Wear Pattern | Probable Cause | Corrective Action |
|---|---|---|
| Built-Up Edge (BUE) / Welding | Cutting speed (Vc) too low or temperature insufficient. | Increase cutting speed (Vc) by 15-20%; check coolant pressure. |
| Notch Wear on Depth-of-Cut Line | Work hardening of stainless steel surface layer. | Vary the depth of cut (ap) between passes; use PVD-coated grade like AC520U. |
| Long Stringy Chips / Wrapping | Feed rate (fn) is below chipbreaker activation threshold. | Increase feed rate (fn) or select a tighter chipbreaker geometry. |
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.