Korloy TNMG220408-HM NC3020 (TNMG 432-HM) Heavy Duty Steel Turning Insert (10pcs)
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The Original Korloy TNMG220408-HM NC3020 (ANSI: TNMG 432-HM) is a heavy-duty Double-Sided Triangular Turning Insert specifically engineered for high-productivity Steel Machining (P-Group). Utilizing the advanced NC3020 CVD Coating, it offers exceptional resistance to high temperatures and crater wear. The HM (Medium Cutting) Chipbreaker combined with a 22mm cutting edge ensures maximum stability and reliable chip control during deep passes on large components.
Maximum Material Removal: TNMG220408 is the powerhouse of the TNMG family. With its larger carbide substrate and 0.8mm (1/32") radius, it excels in roughing and semi-finishing of large steel castings, forgings, and shafts where smaller inserts would fail due to heat or pressure.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 220408-HM |
| ANSI Designation | TNMG 432-HM |
| Inscribed Circle (IC) | 12.7 mm / (1/2") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.8 mm / (1/32") |
| Grade | NC3020 (Top Performance CVD for Steel) |
Core Performance Benefits:
- Enhanced Heat Dissipation: The larger 22mm geometry absorbs and dissipates cutting heat more efficiently, extending tool life during long, continuous cuts.
- Robust HM Chipbreaker: Designed for medium-to-heavy ranges, ensuring chips are broken safely away from the workpiece.
- Superior Edge Toughness: The 0.8mm radius provides the optimal balance between surface finish and the ability to handle interrupted cuts or hard scale.
- Cost Efficiency: Features 6 precision cutting edges for maximum economic throughput.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045 / 45#) | 180-350 m/min (590-1150 sfm) | 0.15-0.50 mm/rev (.006-.020 ipr) | 1.0-6.0 mm (.040-.236") |
| Alloy Steel (4140 / 42CrMo) | 150-300 m/min (490-985 sfm) | 0.15-0.45 mm/rev (.006-.018 ipr) | 1.0-5.0 mm (.040-.197") |
Compatible Tooling Systems:
Requires heavy-duty 22-size (4-size ANSI) holders:
- External Lathe Holders: MTJNR 2525M22 / MTJNR 3232P22 (ANSI 16-4D / 20-4E)
- Heavy Boring Bars: S40U-WTJNR22 / S50V-WTJNR22
Machinist Tip: The "Big Steel" Rule
Optimizing the TNMG220408 for steel production:
The Ultimate Standard. This is the most reliable choice for heavy turning. If your machine has the power, this insert can significantly reduce cycle times by allowing for aggressive feed rates and deeper passes.
If you are facing extreme interrupted cuts or rough castings with heavy scale, consider moving up to a 1.2mm radius. However, for 90% of large steel parts, the 0.8mm (this model) provides the best balance of finish and strength.
Pro Advice: NC3020 is designed for high surface speeds. For large workpieces, maintain consistent cutting speed (SFM) as the diameter changes to ensure uniform chip breaking and tool wear.
Packaging: 10 pieces per box.
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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.