Sumitomo TNMG160404N-GU AC830P Carbide Insert (TNMG 331-GU)
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Sumitomo TNMG160404N-GU AC830P Carbide Insert | ISO TNMG 160404-GU (ANSI TNMG 331-GU)
1. Product Overview
Which turning insert is best for heavy interrupted steel turning, high impact roughing, and preventing micro-chipping on forged steel?
The Sumitomo TNMG160404N-GU AC830P (ANSI Designation: TNMG 331-GU) is a double-sided 60° triangular indexable carbide turning insert engineered specifically for heavy roughing and tough, highly interrupted turning operations across ISO P30–P40 steel applications. Powered by Sumitomo’s ultra-tough AC830P CVD Coating Grade with Absotech® technology, it features an engineered high-toughness substrate paired with a stress-controlled Al2O3 / TiCN multi-layer coating designed to absorb severe impact energy and eliminate edge chipping during heavy shock cuts.
Featuring the versatile GU Universal Medium-to-Roughing Chipbreaker, this insert incorporates an optimized rake angle bump design that lowers cutting resistance while effectively controlling chips across varying depths of cut (ap: 0.8mm to 3.5mm) and feed rates (fn: 0.12mm to 0.40mm). It is the premier choice for machining forged steel shafts, keyway shafts, rough castings, and structural steel components under tough conditions.
2. Product Key Features
- 6 Double-Sided Cutting Edges: Negative 60° triangular geometry provides 6 usable cutting corners for maximum tool economy.
- CVD Absotech® AC830P Grade: High-impact resistance substrate engineered to prevent edge breakage and thermal cracking during interrupted cutting.
- GU Multi-Purpose Chipbreaker: Optimized 3D geometry provides stable chip breaking and smooth chip evacuation across a wide range of feeds and depths of cut.
- Exceptional Edge Toughness: Absorbs mechanical vibrations and severe interrupted forces when turning keyways, hex stock, and irregular forgings.
- Dual ISO / ANSI Standard Compliance: Fully interchangeable according to ISO 1832 and ANSI B212.4 dimensional specifications.
ISO / ANSI Code Nomenclature Breakdown
Detailed geometric interpretation of the TNMG160404N-GU specification standard:
3. Technical Parameters & Metric vs Imperial Comparison
| Specification Parameter | Metric Value (ISO Designation) | Imperial Value (ANSI Designation) |
|---|---|---|
| Product Model Code | TNMG160404N-GU AC830P | TNMG 331-GU AC830P |
| Inscribed Circle (i.C.) | 10.0 mm | 0.375" (3/8") |
| Thickness (S) | 4.76 mm | 0.1875" (3/16") |
| Corner Radius (re) | 0.4 mm | 0.0156" (1/64") |
| Fixing Hole Diameter (d1) | 3.81 mm | 0.150" |
| Insert Substrate Grade | Sumitomo AC830P (CVD Al2O3/TiCN Tough) | Sumitomo AC830P (CVD Al2O3/TiCN Tough) |
Recommended Speeds & Feeds (Cutting Parameters)
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| ISO P: Forged & Carbon Steel (Heavy Interrupted) | 120 - 280 m/min (390 - 920 SFM) |
0.12 - 0.40 mm/rev (0.005 - 0.016 IPR) |
0.8 - 3.5 mm (0.031 - 0.138 in) |
| ISO P: Alloy Steel (4140 / 4340 Keyway Cutting) | 100 - 240 m/min (330 - 785 SFM) |
0.12 - 0.35 mm/rev (0.005 - 0.014 IPR) |
0.8 - 3.0 mm (0.031 - 0.118 in) |
| ISO P: Cast / Structural Steel (Rough Surface Scale) | 90 - 220 m/min (295 - 720 SFM) |
0.10 - 0.30 mm/rev (0.004 - 0.012 IPR) |
0.8 - 2.8 mm (0.031 - 0.110 in) |
Fits all standard ISO turning toolholders with a 60° negative pocket design:
MTJNR / MTJNL 2020K16 Holder MTJNR / MTJNL 2525M16 Holder WTJNR / WTJNL 2020K16 Holder DTJNR / DTJNL 2525M16 Holder Boring Bar: S25S-MTJNR164. Applications & Industrial Operations
- Forged Steel & Splined Shafts: Turning components with keyways, transverse holes, or heavy mill scale without sudden edge chipping.
- Heavy Equipment Machining: Rough machining of forged steel gears, track rollers, and agricultural equipment shafts under high mechanical shock.
- General CNC Shop Workhorse: Ideal setup for job shops handling variable steel stock quality where insert toughness and reliability are critical.
5. Compatibility & Machine Integration
Seamlessly compatible with all CNC lathes, VTLs, multi-tasking turning centers, and heavy engine lathes. Direct drop-in replacement for standard ISO TNMG160404 / ANSI TNMG 331 turning pockets from Sandvik Coromant, Kennametal, Iscar, Kyocera, Tungaloy, Walter, and Seco.
6. Grade Comparison & Equivalent Models Matrix
| Brand | Equivalent Grade | Equivalent Chipbreaker | ISO Material Application |
|---|---|---|---|
| Sumitomo Electric | AC830P | GU | ISO P25-P40 |
| Sandvik Coromant | GC4435 / GC4335 | PM / PR | ISO P25-P40 |
| Kennametal | KCP30B / KCP40 | MP / RP | ISO P25-P40 |
| Iscar | IC830 / IC8250 | M3P / R3P | ISO P25-P40 |
| Kyocera | CA525 / CA530 | MU / MG | ISO P25-P40 |
7. Why Choose Us?
- 100% Guaranteed Original Sumitomo: Direct factory authorization channels ensure genuine Absotech® technology and batch consistency.
- Technical Machining Support: Expert advice on selecting optimal speeds, feeds, and grade selection for severe interrupted cuts.
- Fast Dispatch & Secure Packaging: Sealed industrial 10-piece box packaging ready for rapid global express shipping.
Verified Customer Reviews
Unbeatable impact resistance on keyway turning
"We turn 4340 forged drive shafts with keyways. Other inserts chipped constantly on the impact. AC830P handles the heavy shock cuts without breaking a corner. Outstanding grade!"
— Mark S., Machine Shop Owner (United States 🇺🇸)Extrem zäh bei unterbrochenem Schnitt
"Perfekte Wendeschneidplatte für Schmiedeteile. Die GU-Geometrie bricht die Späne sehr gut und die Standzeit bei Stoßbelastung ist hervorragend."
— Thomas B., Fertigungsleiter (Germany 🇩🇪)Eccezionale resistenza agli urti per pezzi forgiati
"Inserti incredibilmente robusti. Nessuna rottura del tagliente anche nelle lavorazioni pesanti con crosta di fusione."
— Marco V., Capo Officina (Italy 🇮🇹)断続切削での耐欠損性が非常に高く寿命が長い
"AC830Pは強断続加工でのチッピングが大幅に減りました。GUブレーカのチップコントロールも安定しています。"
— Hiroshi M., Senior Tooling Engineer (Japan 🇯🇵)Solid roughing insert for heavy steel parts
"Great toughness for roughing cast steel housings on our CNC lathe."
— Andrew K., Lead Machinist (United Kingdom 🇬🇧)8. Frequently Asked Questions (AI & Voice Search Optimized)
Troubleshooting & Machining Optimization Guide
| Symptom / Failure Mode | Root Cause Analysis | Recommended Action |
|---|---|---|
| Catastrophic Insert Fracture | Excessive impact shock or feed rate too high during heavy interrupted entry. | Slightly reduce entry feed rate (fn) or ensure clamp rigidity; AC830P provides maximum available substrate toughness. |
| Thermal Cracking (Comb Cracks) | Intermittent coolant flow causing extreme temperature fluctuations on the cutting edge. | Ensure constant high-flow coolant coverage or switch to dry machining with air blow on severe interrupted passes. |
| Chip Wrapping / Bird Nesting | Depth of cut ap or feed rate fn too low to engage the GU chipbreaker groove. | Increase feed rate fn above 0.15 mm/rev or increase depth of cut ap to activate proper chip curling. |
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.