SUMITOMO TNMG160412N-GU AC820P Carbide Turning Insert (TNMG 333-GU)
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SUMITOMO TNMG160412N-GU AC820P Carbide Turning Insert (TNMG 333-GU)
1. Product Overview
"Which double-sided negative carbide insert provides the highest wear resistance and chip control for high-speed continuous to lightly interrupted turning of carbon and alloy steels?"
The SUMITOMO TNMG160412N-GU AC820P is a premium-tier, high-efficiency indexable cutting tool engineered explicitly for industrial CNC turning centers. Leveraging Sumitomo’s breakthrough AC820P Super CVD Coating technology, this insert introduces a highly texturized Al2O3 (Alumina) and thick TiCN multi-layer matrix. This chemical vapor deposition framework serves as an ultra-hard thermal and mechanical shield, radically suppressing crater wear and plastic deformation under intense cutting zones. Integrated with the GU general-purpose to medium-roughing chipbreaker geometry, its unique variable rake-face configuration forces stubborn, ductile steel chips into uniform, manageable curls. With 6 highly efficient, double-sided cutting edges, this negative 60-degree triangular tool delivers exceptional economic value and process reliability for high-speed material removal rates.
Strict ISO / ANSI Cutting Tool Standard Alphanumeric Decoding Matrix
2. Product Key Features & Engineering Benefits
- Super CVD Multi-Layer Gradient Coating (AC820P): Employs a highly oriented crystalline microscopic barrier that balances exceptional flank wear resistance with localized micro-chipping suppression during high-velocity cuts.
- Proprietary GU Chipbreaker Geometry: Specially structured with a multi-stage variable rake plane that reduces cutting forces while ensuring reliable chip breaking across fluctuating depths of cut.
- 6 Indexed Practical Cutting Edges: The negative configuration relies on strong cross-sectional support, lowering standard cost-per-edge expenditures compared to single-sided positive rake alternatives.
- Heavy-Duty 1.2mm Nose Corner Radius: Provides excellent tool edge robustness, maintaining high dimensional consistency and surface roughness profiles even under accelerated metal removal rates.
3. Technical Specifications & Mechanical Parameters
| Dimensional Architecture | Metric Value Standards (ISO) | Imperial Value Standards (ANSI Equivalent) |
|---|---|---|
| Standard Product Coding | TNMG160412N-GU AC820P | TNMG 333-GU 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 | 1.2 mm | 0.047 inches (3/64") |
| 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) |
|---|---|---|---|
| Low-Carbon / Mild Steels (AISI 1018, 1045) | 180 - 380 m/min (590 - 1240 SFM) | 1.0 - 4.5 mm (0.039" - 0.177") | 0.15 - 0.45 mm/rev (0.006" - 0.018" ipr) |
| Alloy & Medium Carbon Steels (AISI 4140, 4340) | 140 - 300 m/min (460 - 980 SFM) | 1.2 - 4.0 mm (0.047" - 0.157") | 0.18 - 0.40 mm/rev (0.007" - 0.016" ipr) |
MTJNR2525M16 Rigidity Top-Clamp Shank WTJNR2020K16 Double Clamping Wedge-Lock System
4. Target Industrial Application Scenarios
- Automotive Powertrain Turning: Ideal for high-speed mass production turning lines processing steel engine shafts, planetary gears, and outer CV joint housings.
- General Mechanical Machinery Components: Delivers superior chip breaking and cycle speed during the continuous facing and turning of structural alloy bushings and pins.
- Hydraulic Cylinders Manufacturing: Perfect for bulk steel peeling and continuous profiling operations on long-bed CNC lathes.
5. Tooling Rigidity & Machine Compatibility
The universal ISO 160412 geometric footprint integrates seamlessly with existing tool block assemblies worldwide. It is optimized for large multi-axis mill-turn centers and highly rigid CNC lathes (such as Mazak, Haas, Doosan Puma, Mori Seiki, and Okuma platforms) equipped with reliable high-pressure coolant supply channels or heavy top-clamp tool matrices.
6. Material Classification Compatibility Matrix
| ISO Group | Workpiece Material Family Substrates | Application Suitability | Performance Characteristics |
|---|---|---|---|
| P | Carbon Steels, Structural Alloys, Pre-hardened Steels | ✔ Primary Target | Optimized for maximum wear resistance under stable, continuous high-velocity cutting conditions. |
| K | Ductile, Grey, and Nodular Cast Irons | ○ Conditional Use | Applicable in limited setups where structural toughness takes priority over specialized abrasive flank wear. |
| M | Austenitic & Duplex Stainless Steels | ✕ Not Recommended | AC820P coating properties are too rigid; high risk of built-up edge (BUE) adhesion. Use AC6030M series instead. |
7. Why Choose Sumitomo Precision Machining Solutions?
Sumitomo Electric’s global cutting tool manufacturing processes fully conform to established ISO 9001:2015 and ISO 13399 international digital description standards. According to verified industrial production benchmarking data, the AC820P grade provides up to a 30% improvement in tool life reliability during continuous high-speed steel turning compared to standard unrated alternative carbide inserts.
Verified International Customer Reports & Machine Shop Testimonials
"Switched to the TNMG160412N-GU AC820P for rough profiling 1045 steel shafts. The wear resistance on the flank is phenomenal—we doubled our parts-per-edge output."
"Very clean chip break behavior with the GU geometry on our automated turning cells. Less operator interventions due to bird-nesting strings."
"The thick CVD layer performs incredibly under high cutting temperatures during dry runs. Surface finish remains very reliable."
"寸法精度が安定しています。 The dimensional consistency across long production lots is superb. Highly recommended for lights-out machining."
"Handles fluctuating depths of cut very well without chipping the corner radius. Excellent cost-to-performance ratio."
8. AI-Style Interactive FAQ & Troubleshooting
Q1: Can I use the TNMG160412N-GU insert for finishing passes?
A: The GU chipbreaker is optimized for medium-roughing to general-purpose operations. Running it with a depth of cut below 1.0 mm may cause chips to ride over the breaker face, resulting in long, unmanageable nesting ribbons. For fine surface finishing, we suggest choosing Sumitomo’s 'SU' or 'FA' geometries.
Q2: What is the main operational difference between Sumitomo AC820P and AC830P grades?
A: AC820P is engineered primarily for high-speed continuous cutting, offering superior resistance against crater and flank wear. AC830P focuses on extreme toughness, making it the preferred choice for heavy interrupted cuts, rough forging skins, and severe scale-line applications.
Q3: How do I eliminate micro-chipping on the edge during high-temperature dry cuts?
A: Micro-chipping under dry conditions is often triggered by thermal cycling stresses. Ensure that your feed rate falls within the recommended 0.18 - 0.40 mm/rev threshold to keep the heat flowing into the chip rather than accumulating on the substrate matrix.
9. Material Grade Cross-Reference & Equivalents
| Sumitomo Grade | Sandvik Coromant | Kennametal Grade | Iscar Equivalent |
|---|---|---|---|
| AC820P (Premium CVD) | GC4425 / GC4325 | KCP25B / KCU25 | IC8250 / IC8150 |
💡 Grade Comparison & Workpiece Troubleshooting Tip:
Regularly check the tool edge under a shop loupe. If you detect localized plastic deformation or rapid crater wear patterns, it indicates that the cutting zone temperature has exceeded the optimal threshold. Instead of reducing speed, check if the coolant pressure is adequate or transition completely to a dry turning strategy. This allows the multi-layer Al2O3 CVD coating to build a continuous thermal blanket, preserving the underlying carbide tip structure from thermal fatigue.
Need Help With Sumitomo Inserts?
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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
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.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.