SUMITOMO TNMG160408N-GU AC830P Carbide Turning Insert (TNMG 332-GU)
✓ In Stock & Fast Dispatch: Ships within 24–48 Hours from China
✓ Global Shipping: Express 3–10 Days | Standard 5–15 Days
✓ Guaranteed Quality: 100% Compatibility | Direct Factory Outlet
✓ Technical Support: Need grade selection help? Contact Engineer
SUMITOMO TNMG160408N-GU AC830P Carbide Turning Insert (ANSI: TNMG 332-GU)
1. Product Overview
Which carbide turning insert is best for heavy roughing, interrupted cutting, and forged steel machining under severe vibration conditions?
The SUMITOMO TNMG160408N-GU AC830P (ANSI designation TNMG 332-GU) is a heavy-duty industrial turning insert designed specifically for heavy-roughing, rough machining of forged steels, and interrupted cuts (ISO P25-P35). Featuring SUMITOMO's advanced Absotech Platinum CVD Coating Technology over a high-toughness gradient carbide substrate, this insert delivers unparalleled resistance to mechanical impact, edge chipping, and thermal cracking under harsh turning conditions.
Integrated with the universal GU Medium-Heavy Roughing Chipbreaker, this insert utilizes a strengthened cutting edge profile and a wide chip fluting zone. It actively manages heavy chip loads across depth of cut ranges from 1.0mm to 4.5mm, ensuring smooth chip evacuation, reduced cutting resistance, and extended tool life during high-feed steel turning operations.
2. Key Features
Features a ultra-dense, highly stress-controlled Al2O3 + TiCN multi-layer CVD coating that dramatically reduces thermal cracks and crater wear during high-load roughing.
Engineered with exceptional fracture toughness, enabling stable performance through heavy interrupted cuts, scale-covered forgings, and out-of-round workpieces.
Built with a fortified land edge design and 3D chip-curl channel that controls heavy chip breaking across high feeds (f: up to 0.40 mm/rev) without micro-chipping.
The double-sided negative 60° triangular format offers maximum strength and exceptional economic performance with 6 reliable cutting corners per insert.
3. Specifications & ISO/ANSI Breakdown
Understanding the standard code for order accuracy:
| Parameter | Metric Designation (ISO) | Imperial Designation (ANSI) |
|---|---|---|
| Insert Model Code | TNMG160408N-GU | TNMG 332-GU |
| 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 / Rough Forgings (1045, 1055) | 120 - 280 m/min (390 - 920 SFM) | 0.15 - 0.40 mm/rev (.006 - .016 IPR) | 1.0 - 4.5 mm (.039 - .177 in) |
| Alloy Steel / Interrupted Cuts (4140, 4340, 8620) | 100 - 240 m/min (330 - 780 SFM) | 0.15 - 0.35 mm/rev (.006 - .014 IPR) | 1.0 - 4.0 mm (.039 - .157 in) |
| Structural Steel / Scale Surface (ST52, A36) | 110 - 260 m/min (360 - 850 SFM) | 0.12 - 0.38 mm/rev (.005 - .015 IPR) | 1.0 - 4.2 mm (.039 - .165 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
- Rough Machining of Forgings & Castings: Handles heavy scale, surface inclusions, and uneven stock allowance without edge breakout.
- Heavy Interrupted Cutting: Exceptional shock resistance when turning keyway-cut shafts, hex stock, or components with cross-holes.
- High-Removal CNC Steel Turning: High process reliability during automated roughing routines where insert breakage must be strictly avoided.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: Heavy CNC Lathes, Vertical Turning Lathes (VTL), Precision Turning Centers, 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 | Material Class | Primary Application Field | Key Characteristics |
|---|---|---|---|
| AC830P (Current) | Heavy CVD Coated Carbide | ISO P25-P35 / Heavy Roughing & Interrupted Cut | Extreme toughness and impact resistance; Absotech Platinum CVD coating prevents thermal cracking. |
| AC8025P | General CVD Coated Carbide | ISO P15-P30 / General Steel Turning | Balanced wear resistance and toughness for general medium-to-rough turning operations. |
| AC8015P | High-Speed CVD Carbide | ISO P05-P20 / Continuous High-Speed Roughing | High wear resistance for stable, continuous high-speed cutting on clean steel stock. |
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 completely solved our insert breakage issues when rough turning forged 4340 shafts with heavy keyways. Unbelievable edge toughness."
"Hervorragende Standzeit bei unterbrochenem Schnitt an Schmiedeteilen. Kein Ausbröckeln der Schneidkante mehr."
"Ottimo inserto per sgrossatura pesante. Sopporta urti e crosta di fusione senza problemi."
"Original SUMITOMO quality. AC830P delivers extreme reliability during heavy roughing passes on large steel billets."
"The GU chipbreaker on AC830P controls thick chips cleanly at 3.5mm depth of cut without overheating."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: AC830P is specifically formulated for heavy interrupted cuts, scale-covered forgings, low-rigidity setups, or heavy roughing (ISO P25-P35) where insert chipping or breakage is the primary failure mode. AC8025P is the standard first choice for general, continuous to light interrupted steel turning (ISO P15-P30).
A: While it can execute light passes, AC830P and the GU breaker are optimized for medium-to-heavy stock removal. For fine finishing cuts (ap < 0.5mm) requiring mirror surface quality, a cermet grade like SUMITOMO T1500Z or T1500A with a finishing geometry is recommended.
A: SUMITOMO's Absotech Platinum CVD coating process controls residual stress within the multi-layer TiCN and Al2O3 coating layers. This suppresses thermal cracking caused by heavy friction and intermittent coolant, preventing catastrophic edge chipping.
A: Yes. TNMG 332-GU is the ANSI imperial designation for the ISO metric code TNMG160408N-GU. 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): Carbon Steels, Alloy Steels, Forged Steels, Cast Steels ★★★★★
ISO K (Secondary): Ductile Iron / High-Tensile Cast Iron ★★★★☆
ISO M (Conditional): Martensitic & Austenitic Stainless Steels ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC830P (CVD Coated) | GU |
| Sandvik Coromant | GC4435 / GC4335 | PR / MR |
| Iscar | IC830 / IC8250 | M3P / R3P |
| Kennametal | KCP35B / KCU25 | RP / MP |
| Kyocera | CA320 / CA315 | GS / MU |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Thermal Cracking / Comb Cracks | Severe thermal cycling from erratic coolant application during high-speed cutting. | Increase coolant flow and pressure, or switch to dry turning if using AC830P Absotech coating. |
| Excessive Flank Wear | Cutting speed (Vc) exceeds maximum parameters for workpiece hardness. | Reduce cutting speed (Vc) by 15-20% or switch to a more wear-resistant grade like AC8025P. |
| Workpiece Vibration / Chatter | Depth of cut or feed rate exceeding machine/setup rigidity. | Reduce depth of cut (ap) or switch to a toolholder with higher clamping force (e.g., Rigid Clamp). |
| Edge Breakage on Heavy Impact | Feed rate too aggressive for extreme interrupted cutting depth. | Reduce feed rate (f) by 15% on entry/exit zones, or check tool centerline alignment. |
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 Catalog).
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
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.