SUMITOMO TNMG160408N-GU AC810P Carbide Turning Insert (TNMG 332-GU)
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SUMITOMO TNMG160408N-GU AC810P Carbide Turning Insert (ANSI: TNMG 332-GU)
1. Product Overview
Which carbide turning insert is best for high-speed continuous steel turning, maximum wear resistance, and high-efficiency mass production?
The SUMITOMO TNMG160408N-GU AC810P (ANSI designation TNMG 332-GU) is a premium high-speed turning insert engineered specifically for continuous, smooth turning of carbon, alloy, and tool steels (ISO P05-P15). Formulated with SUMITOMO's ultra-hard Absotech CVD Coating Technology over a high-density, deformation-resistant carbide substrate, this insert delivers unparalleled resistance to flank wear, cratering, and edge recession at elevated surface speeds (Vc up to 450 m/min).
Equipped with the universal GU Medium Cutting Chipbreaker, it pairs high thermal resistance with a balanced 3D rake geometry. This combination guarantees tight chip curl, minimal cutting forces, and predictable dimensional accuracy across depth-of-cut ranges from 0.8mm to 3.5mm during high-volume CNC turning operations.
2. Key Features
Incorporates a highly oriented Al2O3 + TiCN crystalline CVD coating layer that maximizes surface hardness and thermal barrier protection during continuous high-speed cutting.
Engineered with exceptional hot hardness and plastic deformation resistance, preventing nose wear and dimensional drift during long continuous passes.
Optimized 3D rake angle reduces edge build-up (BUE) and promotes stable chip evacuation across medium feeds (f: 0.12 - 0.35 mm/rev).
Double-sided negative 60° triangular design yields 6 high-rigidity cutting corners per insert for maximum economy in mass production environments.
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 / Free Cutting (1045, 12L14) | 220 - 450 m/min (720 - 1470 SFM) | 0.15 - 0.35 mm/rev (.006 - .014 IPR) | 0.8 - 3.5 mm (.031 - .138 in) |
| Alloy Steel Continuous (4140, 4340, 8620) | 180 - 380 m/min (590 - 1250 SFM) | 0.12 - 0.32 mm/rev (.005 - .013 IPR) | 0.8 - 3.0 mm (.031 - .118 in) |
| Bearing Steel / High Tensile (SUJ2, 5160) | 160 - 320 m/min (520 - 1050 SFM) | 0.12 - 0.30 mm/rev (.005 - .012 IPR) | 0.8 - 2.8 mm (.031 - .110 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
- High-Speed Automated Lathe Turning: Ideal for long continuous outer diameter (OD) and facing cuts on clean, forged-free bar stock.
- Mass Production Automotive Components: Optimized for shaft, gear blank, and bushing turning where cycle time reduction and tool longevity are critical.
- Continuous Steel Machining: Unmatched surface speed capabilities on smooth carbon and alloy steel stock without thermal edge deformation.
5. Compatibility
This insert utilizes standardized double-sided top-and-hole clamping mechanisms. It is fully compatible with:
- Machine Types: High-Power CNC Lathes, Automatic Bar Machines, Multi-Axis 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 |
|---|---|---|---|
| AC810P (Current) | High-Speed CVD Carbide | ISO P05-P15 / Continuous High-Speed Turning | Maximum flank and crater wear resistance; ideal for high Vc continuous cutting. |
| AC820P | General CVD Coated Carbide | ISO P10-P25 / General Steel Turning | Balanced wear resistance and toughness; general first choice for steel. |
| AC830P | Heavy CVD Coated Carbide | ISO P25-P35 / Heavy Roughing & Interrupted Cut | Extreme impact toughness for heavy interrupted cuts and rough forged scale. |
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.
"We pushed Vc up to 380 m/min on 1045 steel shafts with AC810P. Flank wear stayed minimal over 150 pieces per corner."
"Hervorragende Verschleißfestigkeit bei hoher Schnittgeschwindigkeit. Ideal für die Serienfertigung von Drehteilen."
"Eccezionale resistenza all'usura a velocità elevate. Perfetto per passate continue su barre di acciaio."
"Original SUMITOMO quality. AC810P gives ultra-stable edge hold during continuous high-speed finishing/medium cuts."
"Dramatically reduced cycle times in our CNC shop by allowing us to safely max out spindle speeds on clean steel bars."
8. Frequently Asked Questions (AI Search & AEO Optimized)
A: Choose AC810P when machining clean continuous steel stock at higher cutting speeds (Vc > 250 m/min) where rapid flank wear or cratering is your main concern. If your operation involves light-to-medium interrupted cuts, AC820P is the safer alternative.
A: No. AC810P is optimized for ultra-high wear resistance in continuous to slight vibration-free cuts. For heavy interrupted cuts or scale-covered forgings, select SUMITOMO AC830P.
A: SUMITOMO's Absotech CVD technology utilizes a highly dense, stress-controlled Al2O3 structure that withstands high friction heat (over 1000°C) without chemical breakdown or micro-chipping, drastically prolonging tool life at elevated surface speeds.
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, Free-Cutting Steels, Alloy Steels (Continuous) ★★★★★
ISO K (Secondary): High-Tensile Cast Iron / Nodular Iron ★★★☆☆
ISO M (Conditional): Martensitic Stainless Steels ★★☆☆☆
| Manufacturer | Equivalent Grade | Equivalent Chipbreaker |
|---|---|---|
| SUMITOMO | AC810P (CVD Coated) | GU |
| Sandvik Coromant | GC4415 / GC4315 | PM / PF |
| Iscar | IC8150 / IC507 | M3P / F3P |
| Kennametal | KCP10B / KCP10 | MP / FP |
| Kyocera | CA5515 / CA310 | MQ / PQ |
| Problem Identified | Probable Cause | Corrective Action |
|---|---|---|
| Corner / Edge Chipping | Interrupted cutting forces exceeding high-hardness substrate toughness limit. | Reduce feed rate (f) or switch to a tougher grade like AC820P or AC830P. |
| Crater Wear / Top Surface Wear | Extreme friction temperature at high cutting speed. | Ensure high-pressure coolant is targeted at the cutting zone, or switch to wet cutting. |
| Plastic Edge Deformation | Cutting temperature exceeds material limit due to extreme Vc and feed combination. | Reduce cutting speed (Vc) by 15% or select an insert with a larger corner radius. |
| Poor Surface Finish | Feed rate too high relative to 0.8mm corner radius. | Reduce feed rate (f) or use a wiper geometry / smaller nose radius insert for finish passes. |
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).
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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.