SUMITOMO TNMG160408N-MU AC630M Stainless Steel Turning Insert (TNMG 332-MU)
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
SUMITOMO TNMG160408N-MU AC630M Carbide Turning Insert (ANSI: TNMG 332-MU)
1. Product Overview
Which insert is best for heavy interrupted medium-to-rough turning of stainless steel alloys under demanding CNC machining conditions?
The SUMITOMO TNMG160408N-MU AC630M (ANSI designation TNMG 332-MU) is a high-performance, double-sided 60° triangular carbide turning insert engineered specifically for stainless steel (ISO M20-M35) turning applications requiring high heat resistance and edge stability. Utilizing SUMITOMO's advanced AC630M Absotech Pro PVD coating technology, this insert pairs an ultra-smooth nano-multilayer coating with an ultra-tough carbide substrate to provide exceptional resistance to thermal cracking, notch wear, and severe built-up edge (BUE).
Featuring the robust MU Medium-Roughing Chipbreaker geometry, the TNMG160408N-MU excels in tough metal-cutting conditions. Its sharp yet reinforced cutting edge minimizes cutting forces on work-hardening materials like 304, 316, and duplex stainless steels, ensuring smooth chip evacuation and extended tool life during continuous and interrupted lathe passes.
2. Key Features
Utilizes ultra-fine TiAlSiN nano-multilayer PVD technology with supreme surface smoothness. Significantly suppresses built-up edge adhesion and thermal fracturing when machining gummy stainless steels.
Optimized for ISO M stainless steel turning. Features an optimized rake face gradient and wave contour to control thick chip curl during medium-to-rough turning operations (depth of cut from 1.0mm to 5.0mm).
Provides 6 usable cutting edges per insert, delivering maximum economy and lowering cost-per-edge on high-production turning centers.
Engineered with a high-toughness micro-grain carbide matrix that prevents depth-of-cut notch wear and edge chipping during heavy scale or interrupted cutting passes.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408N-MU | TNMG 332-MU |
| Inscribed Circle (IC) | 9.525 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.187" (3/16") |
| Corner Radius (r) | 0.8 mm | 0.031" (1/32") |
| 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 (304, 316, 316L) | 120 - 220 m/min (390 - 720 SFM) | 0.18 - 0.40 mm/rev (.007 - .016 IPR) | 1.0 - 4.5 mm (.040 - .177 in) |
| Duplex & Super Duplex (2205, 2507) | 80 - 160 m/min (260 - 520 SFM) | 0.15 - 0.35 mm/rev (.006 - .014 IPR) | 1.0 - 4.0 mm (.040 - .157 in) |
| Martensitic & Ferritic Stainless (410, 430) | 140 - 250 m/min (460 - 820 SFM) | 0.20 - 0.45 mm/rev (.008 - .018 IPR) | 1.2 - 5.0 mm (.047 - .196 in) |
Fits all standard ISO/ANSI MTJNR/L, MTGNR/L, or WTJNR/L external turning toolholders and MTFNR/L boring bars taking 1604 / 332 size negative inserts with top and hole clamping.
Browse Compatible Toolholders (MTJNR/L) →4. Target Applications
- Stainless Steel Roughing & Medium Turning: Excellent performance on pump shafts, valve bodies, flanges, and marine hardware.
- Interrupted & Heavy Cuts: Engineered for keyways, hex bar stock, forgings, and rough casting skin removal in 304, 316, and 2205 duplex.
- Heat-Resistant Alloys: Suitable for medium cuts on select nickel-based alloys and difficult-to-machine tough steels.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: CNC Lathes, Heavy-Duty Turning Centers, Swiss-Type Automatic Lathes, and Manual Lathes.
- Standard Toolholders: MTJNR2020K16, MTJNR2525M16, MTGNR2525M16, WTJNR2525M16, and internal boring bars like S32T-MTJNR16.
- Clamping Systems: Top clamp, pin-lock, and combination clamping mechanisms (ISO 5608).
6. Material & Grade Comparison
| SUMITOMO Grade | Coating Type | Primary Application Field | Key Characteristics |
|---|---|---|---|
| AC630M (Current) | PVD Absotech Pro | ISO M20-M35 / Tough Interrupted | Maximum fracture toughness; suppresses built-up edge and notch wear on heavy cuts. |
| AC6020M | CVD Absotech Platinum | ISO M10-M25 / High-Speed Turning | First choice for continuous, high-speed stainless turning requiring high wear resistance. |
| AC610M | PVD Absotech Pro | ISO M05-M15 / Finishing | Ultra-sharp edge retention for high-precision finishing operations. |
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 anti-counterfeiting tracking codes. Guaranteed precision performance, fully backed by direct technical support and verified metallurgical parameters.
"AC630M solved our notch wear problem on 316L pump shafts. The MU chipbreaker handles depth-of-cut variations without bird-nesting."
"Hervorragende Standzeit bei Duplex 2205. Kein Aufbauschneiden mehr bei mittlerem Vorschub."
"Great toughness on interrupted cuts. Used on hex 304 bar stock and edge holding up much better than our previous grade."
"Original SUMITOMO inserts. Excellent thermal crack resistance when running wet on heavy lathe passes."
"Superb value for money. Getting 6 clean edges per insert with reliable chip control."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC630M is a PVD-coated grade optimized for high toughness (ISO M20-M35), making it superior for interrupted cuts, heavy roughing, and gummy stainless steels prone to built-up edge. AC6020M is a CVD-coated grade (ISO M10-M25) designed for higher cutting speeds and continuous turning where flank wear resistance is key.
A: Yes. While engineered primarily for ISO M stainless steels, AC630M performs very well on carbon steel and alloy steel (ISO P) under wet, interrupted, or tough conditions due to its high substrate toughness and adhesion-resistant coating.
A: The MU chipbreaker activates optimally between 1.0 mm and 5.0 mm depth of cut. For light finishing passes under 0.8 mm depth of cut, consider finishing geometries like SU or GU.
A: Yes. TNMG 332-MU is the ANSI imperial designation for the ISO metric code TNMG160408N-MU. Both specify an insert with a 3/8" (9.525mm) inscribed circle, 3/16" (4.76mm) thickness, and 1/32" (0.8mm) nose radius.
9. Technical Resource & Troubleshooting Guide
ISO M (Primary): Stainless Steel (304, 316, Duplex 2205, Martensitic) ★★★★★
ISO P (Secondary): Carbon Steel, Alloy Steel, Tool Steel ★★★★☆
ISO S (Conditional): Inconel, Titanium Alloys (Light-to-medium passes) ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC630M | MU |
| Sandvik Coromant | GC2025 / GC1115 | MM / MR |
| Iscar | IC907 / IC807 | M3M / MS |
| Kennametal | KCU25 / KC5010 | MS / MP |
| Kyocera | PR1125 / PR1325 | MU / MS |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Built-Up Edge (BUE) | Cutting speed (Vc) too low; insufficient coolant concentration. | Increase cutting speed (Vc) by 15-20%; check coolant pressure and concentration. |
| Notch Wear | Work-hardening depth of cut boundary on stainless steel. | Vary depth of cut (ap) between passes or use variable lead angle toolholder. |
| Thermal Cracking | Thermal shock from intermittent coolant flow during high-temp cut. | Ensure high-volume continuous coolant flow directly to the cutting zone. |
| Bird-nesting Chips | Depth of cut (ap) below MU chipbreaker activation threshold. | Increase ap above 1.0mm or switch to a light finishing breaker (SU / GU). |
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 micro-hardness and coating performance specifications are benchmarked according to official Sumitomo Electric Hardmetal Corp. technical catalog parameters (Absotech Stainless Steel Turning Series).
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.