SUMITOMO TNMG160408N-EX AC630M Stainless Turning Insert (TNMG 332-EX)
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SUMITOMO TNMG160408N-EX AC630M Carbide Turning Insert (ANSI: TNMG 332-EX)
1. Product Overview
Which turning insert is best for general-purpose to medium-heavy turning in stainless steel, offering high resistance to notch wear and edge build-up?
The SUMITOMO TNMG160408N-EX AC630M (ANSI designation TNMG 332-EX) is SUMITOMO's flagship double-sided PVD coated turning insert optimized for general turning, medium roughing, and continuous-to-interrupted cutting in stainless steel (ISO M15-M35) and heat-resistant superalloys (ISO S15-S25). Engineered with Absotech Bronze PVD Coating Technology, AC630M pairs an ultra-smooth nano-multilayer TiAlSiN/TiAlN structure with a tough, deformation-resistant carbide substrate. This combination drastically cuts down friction, prevents built-up edge (BUE), and provides superior resistance to notch wear at the depth-of-cut line when machining work-hardening alloys like 316L, 17-4PH, and Duplex steels.
Featuring the heavy-medium EX Chipbreaker Geometry, this insert incorporates a reinforced rake face and variable-angle chip guide channel. The EX breaker delivers excellent chip control under medium-to-heavy feeds, suppressing thermal cracking and extending tool life under harsh, unstable machining environments.
2. Key Features
Features an ultra-smooth TiAlSiN nano-layer engineered to minimize edge build-up and reduce notch wear along the depth-of-cut boundary in stainless steel turning.
Specially formulated carbide substrate provides exceptional toughness against thermal cracking during wet cutting or frequent intermittent passes.
Designed with a land reinforcement that maintains edge stability under higher feed rates while smoothly curling tough, gummy stainless chips.
Double-sided negative 60° triangular format offers 6 usable cutting edges, maximizing cost-effectiveness and reducing insert turnover frequency.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408N-EX | TNMG 332-EX |
| 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 (304, 316, 316L) | 100 - 220 m/min (330 - 720 SFM) | 0.15 - 0.38 mm/rev (.006 - .015 IPR) | 1.0 - 4.0 mm (.039 - .157 in) |
| Duplex & Super Duplex (2205, 2507) | 80 - 180 m/min (260 - 590 SFM) | 0.12 - 0.32 mm/rev (.005 - .013 IPR) | 0.8 - 3.5 mm (.031 - .138 in) |
| Heat-Resistant Alloys (Inconel, Hastelloy) | 30 - 75 m/min (100 - 245 SFM) | 0.10 - 0.25 mm/rev (.004 - .010 IPR) | 0.5 - 2.5 mm (.020 - .098 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
- Pump & Valve Manufacturing: Excellent performance turning valve stems, pump impellers, and flanges in 316L and Duplex 2205.
- General Medium-Heavy Stainless Roughing: Reliable chip control and long tool life during medium turning on forged stainless bar stock.
- Marine & Chemical Components: Prevents premature depth-of-cut notch wear when turning corrosion-resistant high-nickel steel parts.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: Multi-Axis CNC Lathes, Horizontal Turning Centers, Vertical Turning Lathes (VTL), and Manual Production 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 | Material Class | Primary Application Field | Key Characteristics |
|---|---|---|---|
| AC630M (Current) | General Stainless PVD | ISO M15-M35 / General Turning & Medium Roughing | Flagship grade; exceptional anti-notch wear and overall versatility. |
| AC610M | High-Speed Stainless PVD | ISO M10-M20 / High-Speed Stainless Finishing | Maximum wear resistance for high Vc continuous finishing passes. |
| AC6040M | Tough Stainless PVD | ISO M25-M40 / Severe Interrupted Stainless Turning | Maximum fracture toughness for severe interrupted cuts and 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 anti-counterfeiting tracking codes. Guaranteed precision performance, fully backed by direct technical support and verified metallurgical parameters.
"AC630M is our standard go-to insert for 316L stainless. Notch wear used to kill our old inserts at the scale line, but these hold up remarkably well."
"Sehr gute Standzeit bei der Bearbeitung von Edelstahl 1.4404. Der EX-Spanbrecher bricht die Späne sehr zuverlässig."
"Ottimo inserto per sgrossatura media su acciaio inossidabile. Controllo truciolo impeccabile con il rompitruciolo EX."
"Authentic SUMITOMO inserts. Extended our tool life by 30% on stainless pump housing turning lines."
"The EX breaker handles higher feed rates easily without pushing the part. Great versatile stainless insert."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: Choose the EX chipbreaker when performing medium-heavy turning passes requiring higher depth of cut (ap up to 4.0 mm) or higher feed rates where a stronger edge land is needed. Use the GU chipbreaker for lighter, lower-force medium cutting.
A: AC630M incorporates Absotech Bronze PVD coating technology with high coating adhesion and high-temperature oxidation resistance, preventing micro-chipping and notch failure along the cut line on work-hardening stainless steels.
A: While the Absotech PVD coating offers high heat resistance, flood coolant or high-pressure coolant is strongly recommended when machining stainless steels to flush chips, cool the cutting zone, and maximize insert longevity.
A: Yes. TNMG 332-EX is the ANSI imperial designation for the ISO metric code TNMG160408N-EX. Both codes describe an insert with a 3/8" (9.525mm) inscribed circle, 3/16" (4.76mm) thickness, and 1/32" (0.8mm) corner radius.
9. Technical Resource & Troubleshooting Guide
ISO M (Primary): Austenitic, Ferritic, Martensitic & Duplex Stainless Steels ★★★★★
ISO S (Secondary): High-Temp Alloys & Titanium Medium Turning ★★★★☆
ISO P (Conditional): Tough Steels & Alloy Steels ★★★☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC630M (General PVD) | EX |
| Sandvik Coromant | GC2015 / GC1115 | MM / MR |
| Iscar | IC807 / IC907 | M3M / TF |
| Kennametal | KCU10 / KCU25 | MP / MS |
| Kyocera | PR1535 / PR1225 | MU / MQ |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Notch Wear at Depth-of-Cut Line | Work-hardening layer of stainless steel rubbing against edge boundary. | Vary the depth of cut between passes or switch to an insert with a larger lead angle (e.g., 45°). |
| Built-Up Edge (BUE) | Cutting speed (Vc) is too low, causing material welding to the rake face. | Increase cutting speed (Vc) by 15-20% and ensure adequate coolant lubrication. |
| Flank Wear Rate High | Cutting speed (Vc) exceeds heat limit of PVD coating. | Reduce cutting speed (Vc) slightly or switch to AC610M for continuous finishing passes. |
| Long Continuous Stringy Chips | Feed rate below EX chipbreaker engagement point. | Increase feed rate (f) above 0.18 mm/rev to ensure proper chip compression and fracturing. |
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 (AC6000M Series Stainless Steel Turning Grade Manual).
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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.
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.