SUMITOMO TNMG160408L-HM AC830P Steel Turning Insert (TNMG 332L-HM)
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SUMITOMO TNMG160408L-HM AC830P Carbide Turning Insert (ANSI: TNMG 332L-HM)
1. Product Overview
Which turning insert is best for heavy interrupted steel cutting, turning forged steel parts, or handling scale on carbon and alloy steel under unstable machining conditions?
The SUMITOMO TNMG160408L-HM AC830P (ANSI designation TNMG 332L-HM) is SUMITOMO's premium tough-grade CVD turning insert purpose-built for heavy-duty, rough-to-medium steel turning (ISO P25-P35). Featuring left-hand/directional cutting edge orientation ('L') combined with SUMITOMO's breakthrough Absotech Platinum CVD Coating Technology, AC830P integrates a ultra-thick Al2O3 and TiCN crystalline multilayer on an ultra-tough carbide substrate. This grade delivers maximum shock resistance against mechanical impact, making it the industry benchmark for heavy interrupted cuts, raw casting scale removal, and non-rigid lathe setups.
Engineered with the heavy-medium HM Chipbreaker Geometry, this insert incorporates a land-reinforced cutting edge and wide chip groove. The HM breaker maintains low cutting forces while providing superior chip fracturing across high depths of cut (ap up to 5.0 mm), preventing long stringy chips and protecting against edge chipping under severe thermal and mechanical loads.
2. Key Features
Features ultra-dense Al2O3 and TiCN nanolayers that provide extreme thermal barrier protection, high impact toughness, and superior crater wear resistance during heavy turning.
Specially formulated carbide matrix absorbs severe mechanical shock, preventing edge breakage during heavy interrupted cuts, hex stock turning, and keyway interruptions.
Optimized edge strength and wide chip channel prevent chip jamming and chipping while cleanly breaking tough carbon steel chips across variable feeds.
Double-sided negative 60° triangular design provides 6 sharp, durable cutting edges per insert, reducing tool cost per component.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408L-HM | TNMG 332L-HM |
| 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, 1020, A36) | 140 - 280 m/min (460 - 920 SFM) | 0.20 - 0.50 mm/rev (.008 - .020 IPR) | 1.5 - 5.0 mm (.059 - .197 in) |
| Alloy Steels (4140, 4340, 8620) | 120 - 240 m/min (390 - 790 SFM) | 0.18 - 0.45 mm/rev (.007 - .018 IPR) | 1.2 - 4.5 mm (.047 - .177 in) |
| Tool Steels / Cast Steel (P20, D2 annealed) | 90 - 180 m/min (295 - 590 SFM) | 0.15 - 0.38 mm/rev (.006 - .015 IPR) | 1.0 - 3.8 mm (.039 - .150 in) |
Fits all standard ISO/ANSI MTJNL, MTGNL, or WTJNL left-hand external turning toolholders and MTFNL boring bars taking 1604 / 332 size negative inserts with top and hole clamping.
Browse Compatible Left-Hand Toolholders (MTJNL) →4. Target Applications
- Forged & Cast Steel Components: Rough turning of forged crankshafts, drive shafts, and heavy machinery gears with surface scale.
- Heavy Interrupted Cuts: Ideal for turning splined shafts, keyed shafts, and welded steel assemblies prone to breaking brittle inserts.
- General Machinery Parts: Medium-to-heavy roughing of structural steel bars (A36, 1045, 4140) under high material removal rate (MRR) conditions.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: Heavy CNC Turning Centers, Large Bed Horizontal Lathes, Vertical Turning Lathes (VTL), and Production CNC Lathes.
- Standard Toolholders: MTJNL2020K16, MTJNL2525M16, MTGNL2525M16, WTJNL2525M16, and internal boring bars like S32T-MTJNL16.
- 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 |
|---|---|---|---|
| AC830P (Current) | Tough Steel CVD | ISO P25-P35 / Heavy Roughing & Heavy Interrupted Cut | Maximum shock toughness and fracture resistance for unstable cuts. |
| AC820P | General Steel CVD | ISO P10-P25 / General Turning & Medium Roughing | Balanced wear resistance and toughness for general steel production. |
| AC810P | High-Speed Steel CVD | ISO P05-P15 / Continuous High-Speed Finishing | Maximum crater and flank wear resistance for smooth high Vc passes. |
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.
"AC830P solved our edge chipping issues on 4140 forged shafts with heavy keyway interruptions. Handles impact like a champ."
"Hervorragende Zähigkeit bei unterbrochenem Schnitt in C45 Stahl. Kein Ausbröckeln der Schneidkante mehr."
"Ottima resistenza agli urti per tornitura di pezzi forgiati in acciaio legato. Rompitruciolo HM molto efficace."
"Authentic SUMITOMO inserts. Outstanding wear life on heavy forged steel lathe jobs."
"The L-HM variant is perfect for our left-hand turning operations on heavy axle components. Highly durable grade."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: The 'L' designates a left-hand chipbreaker or directional geometry, optimized for left-hand toolholders (like MTJNL or MTGNL) feeding towards the tailstock or facing direction in specific lathe configurations.
A: Choose AC830P when machining heavy interrupted cuts, raw forged scale, or welded steel components where edge impact fracture is the primary failure mode. Choose AC820P for smooth, continuous medium turning.
A: The HM (Heavy-Medium) chipbreaker performs best at depth of cut (ap) ranging from 1.5 mm to 5.0 mm with feed rates between 0.20 and 0.50 mm/rev in general carbon and alloy steels.
A: Yes. TNMG 332L-HM is the ANSI imperial designation for the ISO metric code TNMG160408L-HM. Both 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): Carbon Steel, Alloy Steel, Tool Steel, Cast Steel ★★★★★
ISO K (Secondary): Nodular Cast Iron, Ductile Iron ★★★★☆
ISO M / S: Conditional / Non-Primary Application ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC830P (Tough Steel CVD) | HM |
| Sandvik Coromant | GC4335 / GC4235 | HM / PR |
| Iscar | IC830 / IC8250 | R3P / GN |
| Kennametal | KCP35B / KCP30 | RP / MP |
| Kyocera | CA530 / CA525 | PH / C25 |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Cutting Edge Fracture / Chipping | Excessive shock on interrupted cut or feed rate too high. | Reduce feed rate slightly, maintain stable clamping, or confirm AC830P grade is engaged. |
| Rapid Crater Wear | Cutting speed (Vc) is too high for heavy roughing depth. | Reduce cutting speed (Vc) by 10-15% to maintain thermal equilibrium on the CVD coating. |
| Long Ribbon/Birdnest Chips | Depth of cut or feed rate below HM breaker activation threshold. | Increase feed rate (f) above 0.20 mm/rev or increase depth of cut (ap) above 1.5 mm. |
| Workpiece Surface Tear | Rake face built-up edge at low speed. | Increase cutting speed (Vc) to enter optimal plastic deformation zone for steel. |
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 Manual).
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This Sumitomo insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.