SUMITOMO TNMG160408N-UX AC820P Carbide Turning Insert (TNMG 332N-UX)
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SUMITOMO TNMG160408N-UX AC820P Carbide Turning Insert (TNMG 332N-UX)
1. Product Overview
"Which negative indexable insert grade delivers the longest tool life and best crater wear resistance during high-speed, continuous turning of carbon and alloy steels?"
The SUMITOMO TNMG160408N-UX AC820P is an industry-standard, high-efficiency carbide turning insert specifically engineered to maximize metal removal rates (MRR) in structural and automotive steel applications. Operating optimally in the ISO P05-P25 application band, this negative double-sided triangular insert features Sumitomo’s breakthrough AC820P Absotech Platinum Super Texturized CVD coating technology. By combining a highly dense $TiCN$ inner layer with a highly uniform alpha-alumina ($Al_2O_3$) outer crystal structure, this grade creates an impenetrable thermal shield over a highly deformation-resistant carbide substrate. The advanced UX chipbreaker geometry incorporates a specialized variable-angle rake flank and a wavy chip-control groove, dropping cutting forces while delivering reliable chip evacuation during continuous medium-roughing operations. With 6 economical cutting edges, it helps modern machine shops systematically suppress cost-per-piece operating metrics.
Strict ISO / ANSI Cutting Tool Standard Alphanumeric Decoding Matrix
2. Product Key Features & Engineering Benefits
- Absotech Platinum CVD AC820P Coating: Leverages a highly smooth surface treatment that suppresses adhesion and micro-chipping while delivering elite resistance to crater wear during continuous turning loops.
- Variable-Angle UX Chipbreaker Architecture: Features a wavy profile structure that manages variable depths of cut, providing smooth chip curling and lowering spindle loading parameters.
- High-Rigidity 0.8mm Tip Profile: Offers an exceptional operational sweet spot between microscopic edge toughness and highly precise surface finishes.
- Double-Sided 6-Edge Cost Strategy: Incorporates a negative geometry design that provides 6 functional cutting points per insert, maximizing shop consumable efficiency.
3. Technical Specifications & Mechanical Parameters
| Dimensional Architecture | Metric Value Standards (ISO) | Imperial Value Standards (ANSI Equivalent) |
|---|---|---|
| Standard Product Coding | TNMG160408N-UX AC820P | TNMG 332N-UX AC820P |
| Inscribed Circle (IC) | 9.525 mm | 0.375 inches (3/8") |
| Effective Cutting Edge Length | 16.5 mm | 0.650 inches |
| Total Insert Thickness | 4.76 mm | 0.187 inches (3/16") |
| Corner Nose Radius | 0.8 mm | 0.031 inches (1/32") |
| Center Hole Diameter | 3.81 mm | 0.150 inches |
Recommended Cutting Speeds, Feeds, and Depth of Cut (DOC) Reference
| ISO Substrate Family Group | Cutting Speed (Vc) | Depth of Cut (Ap) | Feed Rate (Fn) |
|---|---|---|---|
| Continuous High-Speed Carbon Steels (AISI 1045, 1018) | 200 - 450 m/min (650 - 1475 SFM) | 1.0 - 4.5 mm (0.039" - 0.177") | 0.18 - 0.45 mm/rev (0.007" - 0.018" ipr) |
| Low-Alloy Carbon Steels / Light Interruptions (AISI 4140, 8620) | 160 - 350 m/min (520 - 1150 SFM) | 1.2 - 4.0 mm (0.047" - 0.157") | 0.20 - 0.40 mm/rev (0.008" - 0.016" ipr) |
MTJNR2525M16 Heavy Top-Clamp Shank WTJNR2020K16 Double Clamping Wedge Holder
4. Target Industrial Application Scenarios
- Automotive Powertrain Turning: Engineered for stable, high-velocity outer diameter facing and profiling loops on forging gear blanks and transmission lines.
- Continuous Carbon Steel Machining: Optimizes metal removal metrics across long structural tube stock and heavy shafts without degradation.
- High-Volume CNC Production: Extends processing windows in high-output shops running low-to-medium alloy steel components.
5. Machine Tool Clamping Rigidity & Equipment Compatibility
Constructed according to global alphanumeric standardization guidelines, this negative insert matches any standard external or internal indexable toolholder seat. It operates reliably across highly rigid slant-bed or flat-bed CNC lathes and multi-axis turn-mill configurations (such as Haas ST series, Mazak Quick Turn, Doosan Puma, and Okuma LB industrial models) using high-stability top-clamp or robust wedge-lock tooling systems.
6. Material Classification Compatibility Matrix
| ISO Group | Workpiece Material Family Substrates | Application Suitability | Performance Characteristics |
|---|---|---|---|
| P | Carbon Steels, Low-Alloy Steels, Cold-Drawn Shafting (AISI 1045, 4140, 8620) | ✔ Primary Target | Super texturized CVD alumina coating delivers exceptional thermal protection, stopping crater degradation at elevated continuous surface cutting feeds. |
| M | Ferritic & Martensitic Stainless Alloys (AISI 420, 430) | ○ Conditional Use | Can be utilized under highly stable high-feed sequences on non-gummy stainless steel variations where cutting heat is high. |
| K | Gray Cast Iron, Nodular Graphite Irons | ✕ Not Recommended | The P20 substrate matrix lacks the specific abrasion resistance required to counteract brittle graphite casting chips. Use specialized AC4015K grades instead. |
7. Why Choose Sumitomo Precision Machining Solutions?
All Sumitomo Electric cutting inserts conform strictly to parameters governed by the ISO 9001:2015 international quality standard. Extensive production facility testing confirms that the AC820P Absotech Platinum technology provides an upward increase of up to 35% in edge lifespans during continuous steel turning relative to standard conventional CVD coating alternatives.
Verified International Customer Reports & Machine Shop Testimonials
"We push these inserts on 1045 shaft lines at 1100 SFM. The smoothness of the coating eliminates edge buildup, keeping our diameters perfectly consistent over long shifts."
"Der UX-Spanbrecher liefert hervorragende Spanbildung bei 2,5 mm Schnitttiefe. Highly reliable execution during automated CNC continuous outer diameter facing."
"Elite crater wear resistance at high speeds. It can take very light interrupted passes, but if you have severe mechanical slamming shocks, opt for the tougher AC830P grade instead."
"Absotechのコーティング効果で耐摩耗性が非常に優れています。 Extended tool longevity makes unattended running much safer for our shop floor."
"Six robust cutting edges per negative piece deliver exceptional financial sense. Our tooling overhead per automotive axle batch fell by a solid 25%."
8. AI-Style Interactive FAQ & Troubleshooting
Q1: When should I select the AC820P grade instead of the tougher AC830P grade?
A: The AC820P is optimized for continuous, high-surface-speed turning where maximum resistance to crater wear and heat is needed. If your turning passes involve heavy structural interruptions, shocks, or scale variations, switch to the tougher AC830P grade.
Q2: What is causing the metal chips to string out and bird-nest around the component?
A: The UX chipbreaker geometry requires an optimal feed rate (Fn >= 0.18 mm/rev) to engage its breaking channel. If you run below this feed threshold, the chip remains too thin to bend and break. Increase your feed rate or modify depth of cut slightly.
Q3: Should I run this CVD coated insert with flood coolant or dry?
A: For stable, continuous high-speed turning, heavy flood coolant helps lower tool face temperatures and flush chips. However, if any mild structural interruptions are present, running completely dry prevents thermal cycle stress micro-fracturing across the thick CVD layer.
9. Material Grade Cross-Reference & Equivalents
| Sumitomo Grade | Sandvik Coromant | Kennametal Grade | Iscar Equivalent |
|---|---|---|---|
| AC820P (High-Speed CVD Steel) | GC4425 / GC4325 | KCP25B / KC9125 | IC8250 / IC6025 |
💡 Grade Comparison & Workpiece Troubleshooting Tip:
Unlike thin-film PVD coatings built for stainless steels or superalloys, the thick-film AC820P CVD structure is explicitly engineered to withstand the extreme thermal loads generated by fast carbon steel turning. If you notice rapid built-up edge (BUE) or material adhesion forming on the rake wall during slower cutting sequences, elevate your linear cutting speed (Vc) by 15-20% to reach the optimal shearing temperature. This adjustment enables workpiece chips to slip smoothly across the Absotech Platinum shield, preserving edge accuracy and maintaining high surface qualities.
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.