SUMITOMO TNMG160404R-HM AC510U Stainless Steel Turning Insert (TNMG 331R-HM)
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SUMITOMO TNMG160404R-HM AC510U Stainless Steel Carbide Turning Insert (ANSI: TNMG 331R-HM)
1. Product Overview
Which turning insert is best for high-efficiency, precision turning of austenitic stainless steels and heat-resistant alloys where notch wear, work hardening, and thermal fracturing must be prevented?
The SUMITOMO TNMG160404R-HM AC510U (ANSI designation TNMG 331R-HM) is SUMITOMO's premium, high-wear-resistance turning grade explicitly engineered for difficult-to-cut materials like austenitic stainless steel (304, 316, 316L), duplex alloys, and HRSA superalloys (ISO M05-M15 & S05-S15 crossover). Featuring a right-hand directional edge orientation ('R') paired with a precision 0.4mm (1/64") corner radius, this insert suppresses micro-vibrations, minimizes radial cutting forces, and allows stable profiling into tight shoulders and thin-walled cylindrical components.
Engineered with SUMITOMO's advanced Absotech Pro PVD Coating Technology (TiAlSiN multi-layer) over an ultra-fine tough carbide matrix, the AC510U grade delivers superior oxidation resistance at elevated cutting temperatures while drastically suppressing adhesion and boundary notch wear. Combined with the HM Heavy-Medium Chipbreaker Geometry, it provides exceptional chip control across medium depths of cut (ap up to 4.5 mm) while maintaining razor-sharp edge toughness under variable feeds.
2. Key Features
Features high-hardness TiAlSiN nano-layers providing extreme heat stability, resisting boundary notch wear and built-up edge (BUE) formation during high-speed stainless steel machining.
Dramatically reduces passive radial cutting pressure, preventing chatter on slender shafts and enabling smooth, tight-radius shoulder finishing.
Combines a sharp rake angle with an optimized variable land geometry to curl and break tough, gummy stainless steel chips without work-hardening the workpiece substrate.
Double-sided negative 60° triangular design delivers 6 usable cutting corners per insert, ensuring optimal cost efficiency and tool life per edge.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code breakdown for accurate tooling identification:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160404R-HM | TNMG 331R-HM |
| 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) |
|---|---|---|---|
| Austenitic Stainless Steel (SUS304, SUS316, 316L) | 140 - 240 m/min (460 - 790 SFM) | 0.10 - 0.30 mm/rev (.004 - .012 IPR) | 0.8 - 4.0 mm (.031 - .157 in) |
| Duplex & PH Stainless Steel (2205, 17-4PH) | 110 - 190 m/min (360 - 620 SFM) | 0.10 - 0.25 mm/rev (.004 - .010 IPR) | 0.8 - 3.5 mm (.031 - .138 in) |
| Heat-Resistant Alloys & Titanium (Inconel 718, Ti-6Al-4V) | 40 - 90 m/min (130 - 295 SFM) | 0.08 - 0.20 mm/rev (.003 - .008 IPR) | 0.5 - 2.5 mm (.020 - .098 in) |
Fits all standard ISO/ANSI MTJNR, MTGNR, or WTJNR right-hand external turning toolholders and MTFNR boring bars taking 1604 / 331 size negative inserts with top and hole clamping.
Browse Compatible Right-Hand Toolholders (MTJNR) →4. Target Applications
- Medical & Marine Components: Precision turning of 316L stainless valve bodies, shafts, pump impellers, and marine fittings.
- Aerospace & Energy HRSA Turning: Machining nickel-base alloys, titanium, and precipitation-hardening stainless steels under coolant flow.
- Medium Roughing to Semi-Finishing: Continuous and lightly interrupted cuts where chip packing and notch wear destroy conventional tools.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: CNC Turning Lathes, Swiss Lathes, Horizontal Turning Centers, and Multi-Tasking Machining Centers (Haas, Mazak, Doosan/DN Solutions, Okuma, Citizen, Tsugami).
- Standard Toolholders: MTJNR2020K16, MTJNR2525M16, MTGNR2525M16, WTJNR2525M16, and boring bars such as S32T-MTJNR16.
- 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 |
|---|---|---|---|
| AC510U (Current) | Stainless / HRSA Absotech PVD | ISO M05-M15 & S05-S15 (Continuous/High Speed) | Maximum wear and notch resistance for high-speed stainless steel turning. |
| AC520U | Stainless / HRSA Absotech PVD | ISO M15-M25 & S15-S25 (General Machining) | Versatile balance of toughness and wear resistance for general stainless steels. |
| AC530U | Stainless / HRSA Tough PVD | ISO M25-M35 & S25-S35 (Interrupted Cutting) | Ultra-tough substrate engineered to withstand severe mechanical impacts and interrupted cuts. |
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.
"AC510U stopped notch wear completely when turning 316L stainless shafts at 180 m/min. Excellent surface finish."
"Sehr gute Standzeit bei V4A (1.4404). Kein Aufbauschneiden mehr feststellbar."
"Prestazioni eccellenti su acciaio inossidabile duplex. Il rompitruciolo HM gestisce bene l'evacuazione."
"SUS304の旋削加工で境界摩擦摩耗が劇的に減少し、工具寿命が1.8倍に延びました。"
"Running these on 17-4PH parts. Corner radius holds dimensional tolerance for over 80 parts per edge."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC510U utilizes SUMITOMO's Absotech Pro PVD nano-coating (TiAlSiN), which provides extreme oxidation resistance and heat dissipation, stopping built-up edge (BUE) and notch wear on stainless steels.
A: The smaller 0.4mm nose radius reduces cutting forces and tool-workpiece contact area, preventing work-hardening of the stainless steel surface and chatter on thin-walled shafts.
A: The HM geometry features an optimized rake wall and variable land that cleanly curls continuous stringy stainless steel chips, preventing bird-nesting and chip-re-cutting.
A: Yes. TNMG 331R-HM is the ANSI imperial code for the ISO metric designation TNMG160404R-HM (3/8" Inscribed Circle, 3/16" Thickness, 1/64" Corner Radius).
9. Technical Resource & Troubleshooting Guide
ISO M (Primary): Austenitic Stainless Steel, Duplex, Ferritic/Martensitic (304, 316, 2205) ★★★★★
ISO S (Secondary): Heat-Resistant Superalloys, Inconel, Titanium Alloys (S05-S15) ★★★★☆
ISO P / K: Steel / Cast Iron Crossover Applications ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC510U (Absotech PVD) | HM |
| Sandvik Coromant | GC1115 / GC2015 | MM / MR |
| Iscar | IC807 / IC907 | M3M / SM |
| Kennametal | KCU10 / KC5010 | MS / MS2 |
| Kyocera | PR1535 / PR1125 | MS / MQ |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Notch Wear at Depth of Cut Line | Work-hardened layer on stainless steel causing boundary abrasion. | Increase feed rate or vary depth of cut (ap) between passes to avoid repeated depth line contact. |
| Built-Up Edge (BUE) / Chipping | Cutting speed too low, causing stainless steel material to weld to the edge. | Increase cutting speed (Vc) by 15-20% and ensure high-pressure coolant is targeted at the cutting zone. |
| Thermal Cracking / Comb Cracks | Thermal cycling during wet machining. | Verify steady, high-flow coolant coverage or switch to AC520U/AC530U grade if severe interrupted cuts occur. |
| Workpiece Chatter / Finish Defect | High passive radial force on slender shaft parts. | Ensure 0.4mm corner radius is maintained, check tool overhang, and increase lead angle using MTJNR holder. |
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 (AC510U Series Stainless Steel 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.
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.
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