SUMITOMO TNMG160408N-MU AC830P Carbide Turning Insert (TNMG 332-MU)
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SUMITOMO TNMG160408N-MU AC830P Carbide Turning Insert (ANSI: TNMG 332-MU)
1. Product Overview
Which insert is best for heavy interrupted medium-to-rough turning of steel alloys under tough CNC machining conditions?
The SUMITOMO TNMG160408N-MU AC830P (ANSI designation TNMG 332-MU) is an industrial-grade, double-sided 60° triangular carbide turning insert engineered for general steel (ISO P30-P40) turning applications requiring superior fracture toughness. Featuring SUMITOMO's advanced AC830P Absotech Platinum CVD coating technology, this insert combines an ultra-thick Al2O3 ceramic thermal barrier with a textured TiCN inner wear layer to deliver exceptional resistance to edge chipping, thermal cracking, and heavy impact during interrupted cuts.
Equipped with the specialized MU Medium-Roughing Chipbreaker geometry, the TNMG160408N-MU excels at high depth of cut machining. Its optimized rake angle and smooth land design reduce cutting resistance while providing excellent chip breaking across fluctuating feed rates, eliminating long-stringy chips and minimizing spindle vibration on high-power lathes.
2. Key Features
Features thick Al2O3 and nano-crystal TiCN layers with stress-controlled coating surfaces. Delivers outstanding thermal insulation and wear resistance up to 1,200°C, drastically extending tool life in heavy interrupted cutting.
Specifically contoured for ISO P steel turning. The reinforced cutting edge and wide chip groove ensure smooth chip curling and fracture during medium-to-rough turning operations (depth of cut from 1.0mm to 5.0mm).
Provides 6 usable cutting edges per insert, delivering maximum cost efficiency per cutting edge compared to positive inserts for negative toolholders.
Formulated with a high-toughness gradient carbide substrate that prevents catastrophic insert breakage during scale-removing, forged steel turning, or severe interrupted cuts.
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) |
|---|---|---|---|
| Carbon Steel / Alloy Steel (1045, 4140, 4340) | 150 - 280 m/min (490 - 920 SFM) | 0.20 - 0.45 mm/rev (.008 - .018 IPR) | 1.0 - 5.0 mm (.040 - .196 in) |
| Forged Steel / Heavy Interrupted Steel | 120 - 220 m/min (390 - 720 SFM) | 0.18 - 0.40 mm/rev (.007 - .016 IPR) | 1.0 - 4.5 mm (.040 - .177 in) |
| Cast Steel / Structural Steel (A36, ST52) | 140 - 260 m/min (460 - 850 SFM) | 0.22 - 0.48 mm/rev (.009 - .019 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
- Medium-to-Rough Steel Turning: Outstanding performance on forged components, shaft roughing, and heavy stock removal.
- Interrupted Cutting Operations: Ideal for keyways, hex stock, weldments, and uneven surface scale machining (1045, 4140, 8620, S45C).
- High-Feed Machining: Engineered for robust lathe setups requiring strong chip control at elevated feed rates.
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, Multi-Tasking Lathes, and Manual Engine 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 |
|---|---|---|---|
| AC830P (Current) | CVD Absotech Platinum | ISO P30-P40 / Heavy Interrupted | Maximum edge toughness; prevents chipping on heavy roughing & interrupted cuts. |
| AC8025P | CVD Absotech Platinum | ISO P15-P35 / General Turning | First choice general-purpose grade balancing wear resistance and toughness. |
| AC8015P | CVD Absotech Gold | ISO P05-P20 / High Speed | High wear resistance for continuous high-speed finishing/medium turning. |
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.
"Switched to AC830P for turning forged 4140 keyway shafts. Insert corner wear is down dramatically compared to our old P30 grade. Corner holds up great in heavy interruptions."
"Sehr gute Standzeit bei unterbrochenem Schnitt auf C45 Stahl. Die MU Geometrie bricht die Späne hervorragend."
"Eccellente inserto per sgrossatura su acciai legati. Buon controllo del truciolo anche ad alti avanzamenti."
"Original SUMITOMO quality. Great resistance against micro-chipping on cast steel parts."
"Reliable grade for heavy roughing passes. The MU chipbreaker handles depth of cut variations without bird-nesting."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC830P is designed specifically for heavy toughness applications (ISO P30-P40) like severe interrupted cuts, forged steel scale turning, or unstable machining setups. AC8025P is a general-purpose grade (ISO P15-P35) optimized for balanced wear resistance and toughness under continuous to light-interrupted conditions.
A: While it can handle ferritic/martensitic stainless steel under heavy roughing conditions, it is optimized for ISO P steel. For austenitic stainless steel (e.g., 304, 316), specialized M-grade inserts such as SUMITOMO AC520U or AC6020M with an SU chipbreaker will deliver superior chip breaking and longer tool life.
A: The MU chipbreaker performs best at a depth of cut (ap) between 1.0 mm and 5.0 mm. For lighter finishing below 0.8 mm depth of cut, light-cutting breakers such as the SU or UX geometries are recommended.
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 P (Primary): Carbon steel, Alloy steel, Forged steel, Structural steel ★★★★★
ISO K (Secondary): Ductile iron, Nodular cast iron ★★★☆☆
ISO M (Conditional): Martensitic stainless steel ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC830P | MU |
| Sandvik Coromant | GC4435 / GC4335 | PM / PR |
| Iscar | IC830 / IC8250 | M3M / M3P |
| Kennametal | KCP30B / KCP40 | MP / RP |
| Kyocera | CA530 / CA525 | MU / MS |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Edge Chipping / Fracture | Excessive feed rate during impact; unstable setup rigidity. | Reduce feed rate (f) by 15%; verify rigidity of workpiece clamping and overhang. |
| Rapid Flank Wear | Cutting speed (Vc) too high for tough AC830P substrate. | Reduce cutting speed (Vc); consider shifting to AC8025P for continuous cuts. |
| Thermal Cracking | Thermal shock from intermittent coolant supply on high-temp cut. | Ensure high-volume continuous coolant flow or run dry with air blast. |
| Bird-nesting Chips | Depth of cut (ap) below MU chipbreaker activation threshold. | Increase ap above 1.0mm or select a lighter finishing breaker (e.g., SU / UX). |
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 Steel Turning Series).
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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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