SUMITOMO TNMG160408N-GE AC8015P Steel Turning Insert (TNMG 332-GE)
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SUMITOMO TNMG160408N-GE AC8015P Carbide Turning Insert (ANSI: TNMG 332-GE)
1. Product Overview
Which turning insert is best for high-speed continuous turning in carbon and alloy steels requiring extreme wear resistance and robust medium-to-heavy chip control?
The SUMITOMO TNMG160408N-GE AC8015P (ANSI designation TNMG 332-GE) is an advanced CVD coated turning insert designed specifically for high-speed continuous to light-interrupted turning operations in carbon steels, alloy steels, and tool steels (ISO P05-P20). Engineered with SUMITOMO's breakthrough Absotech Platinum CVD Coating Technology, this grade features a highly crystal-oriented Al2O3 layer over a ultra-dense TiCN boundary layer, providing unparalleled resistance to crater wear, flank abrasion, and high thermal oxidation at surface speeds exceeding 350 m/min.
Equipped with the heavy-duty GE Chipbreaker Geometry, this insert combines a strong cutting edge with an optimized 3D chip channel. The GE breaker excels in high-feed medium roughing to heavy cutting applications, ensuring reliable chip curling, low cutting temperature build-up, and long, predictable tool life in continuous automated lathe operations.
2. Key Features
Utilizes a thick, crystal-oriented Al2O3 ceramic layer that acts as an exceptional heat barrier, minimizing crater wear during high-speed, high-temperature continuous steel turning.
Formulated with a high-hardness tungsten carbide substrate designed to prevent plastic deformation on the cutting edge under severe thermo-mechanical stress.
Features a reinforced edge land and a wide rake groove that controls thick chips reliably during medium-to-heavy turning without causing vibration or edge chipping.
Double-sided negative 60° triangular design delivers 6 strong cutting corners per insert, ensuring high-volume productivity and lower cost-per-edge.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408N-GE | TNMG 332-GE |
| 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 Steels (1045, 1050, C45) | 200 - 420 m/min (650 - 1380 SFM) | 0.20 - 0.50 mm/rev (.008 - .020 IPR) | 1.2 - 4.5 mm (.047 - .177 in) |
| Alloy Steels (4140, 4340, 42CrMo4) | 180 - 380 m/min (590 - 1250 SFM) | 0.18 - 0.45 mm/rev (.007 - .018 IPR) | 1.0 - 4.0 mm (.039 - .157 in) |
| Bearing / Tool Steels (52100, D2, H13) | 140 - 280 m/min (460 - 920 SFM) | 0.15 - 0.38 mm/rev (.006 - .015 IPR) | 1.0 - 3.5 mm (.039 - .138 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
- Automotive Drive Components: Ideal for high-speed automated production of drive shafts, axles, forged gears, and transmission blanks.
- Heavy Machinery Shafts & Rollers: Highly effective for continuous long-pass turning of large alloy steel shafts and hydraulic piston rods.
- High-Throughput Roughing to Semi-Finishing: Outstanding wear life in continuous high-speed CNC turning environments where tool changes must be minimized.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: High-Power CNC Lathes, Horizontal Turning Centers, Vertical Lathes (VTL), and Automatic 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 |
|---|---|---|---|
| AC8015P (Current) | High-Speed Steel CVD | ISO P05-P20 / High-Speed Continuous Steel Turning | Maximum wear resistance and thermal stability for high-speed continuous cuts. |
| AC8025P | General Steel CVD | ISO P15-P30 / General Steel Turning & Light Interrupts | Flagship steel grade; optimal balance of wear resistance and edge toughness. |
| AC8035P | Tough Steel CVD | ISO P25-P40 / Heavy Interrupted Steel Turning | Maximum fracture toughness for severe interrupted cuts and heavy forging 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.
"AC8015P is an absolute monster on 4140 pre-hardened shaft runs at 1,100 SFM. Crater wear is practically non-existent compared to our old inserts."
"Hervorragende Verschleißfestigkeit bei hoher Schnittgeschwindigkeit in C45. Perfekte Spankontrolle mit dem GE-Spanbrecher."
"Ottimo inserto per sgrossatura e media tornitura ad alta velocità su acciaio legato. Molto stabile."
"Authentic SUMITOMO inserts. Tool life increased by 35% on high-speed continuous driveshaft turning lines."
"The GE chipbreaker breaks heavy 4140 chips cleanly without jamming. Brilliant grade for long continuous passes."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: Choose AC8015P for high-speed, continuous turning operations in carbon and alloy steels where maximum wear resistance and thermal stability are required. For general-purpose steel turning with occasional light interruptions, AC8025P is the preferred choice.
A: The GE chipbreaker is engineered for heavier depth of cut and higher feed rates (medium to heavy turning), featuring a stronger cutting edge. The GU chipbreaker is a general-purpose medium cutting breaker designed for lighter feeds and lower cutting forces.
A: AC8015P is optimized for continuous cuts to very light interruptions. For moderate to severe interrupted turning or heavy scale removal, select a tougher grade such as AC8025P or AC8035P to prevent edge fracture.
A: Yes. TNMG 332-GE is the ANSI imperial designation for the ISO metric code TNMG160408N-GE. 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 P (Primary): High-Speed Carbon Steels, Alloy Steels, Tool Steels ★★★★★
ISO K (Secondary): High-Strength Ductile Irons (High Speed) ★★★☆☆
ISO M / S: Not Recommended
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC8015P (CVD Coated) | GE |
| Sandvik Coromant | GC4415 / GC4315 | PR / PM |
| Iscar | IC8150 / IC5150 | M3P / R3P |
| Kennametal | KCP10B / KCP05B | RP / MP |
| Kyocera | CA515 / CA510 | PG / PH |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Crater Wear on Rake Face | Extreme cutting temperature during high-speed continuous pass. | Ensure high-volume coolant flow or switch to a grade with higher thermal barrier protection. |
| Cutting Edge Fracturing | Impact force too high during unexpected interrupted cuts. | Switch to a tougher steel grade like AC8025P or AC8035P. |
| Plastic Deformation | Cutting speed or feed rate exceeds heat dissipation limit of edge. | Reduce cutting speed (Vc) by 10-15% or lower depth of cut (ap). |
| Unbroken Birdnesting Chips | Feed rate below GE chipbreaker activation threshold. | Increase feed rate (f) above 0.20 mm/rev to properly engage chip groove. |
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 (AC8000P Series Steel Turning Grade Technical Guide).
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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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