Korloy TNMG220404-HM NC3020 (TNMG 431-HM) Heavy Steel Turning Insert (10pcs)
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The Original Korloy TNMG220404-HM NC3020 (ANSI: TNMG 431-HM) is a robust, large-format Triangular Turning Insert designed for Heavy-Duty Steel Machining (P-Group). Featuring the premium NC3020 CVD Coating, this insert is built for high-speed continuous cutting in large-scale carbon and alloy steel components. The HM (Medium Cutting) Chipbreaker and 22mm edge length provide the stability required for deep passes, while the 0.4mm radius ensures superior dimensional precision.
Heavy-Duty Stability: The TNMG2204 series is the "big brother" of the 1604, offering more carbide mass to absorb heat and vibration. It is the go-to choice for large diameter shafts, oil-field components, and heavy industrial machining where a standard 16mm insert might struggle with rigidity.
Technical Specifications (Metric & Imperial):
| ISO Designation | TNMG 220404-HM |
| ANSI Designation | TNMG 431-HM |
| Inscribed Circle (IC) | 12.7 mm / (1/2") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3020 (Premium CVD for Steel) |
Core Performance Benefits:
- Large Edge Length (22mm): Allows for larger depth of cut (ap) and better heat dissipation than standard 16mm inserts.
- NC3020 High-Speed Coating: CVD technology provides extreme hardness and thermal protection for dry or wet machining.
- HM Universal Geometry: Optimized chipbreaker curls and breaks steel chips effectively across a wide feed range.
- 6 Cutting Edges: Double-sided design ensures high productivity and lower cost-per-edge.
Recommended Cutting Parameters:
| Material Group | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Carbon Steel (1045) | 180-320 m/min (590-1050 sfm) | 0.10-0.35 mm/rev (.004-.014 ipr) | 0.5-5.0 mm (.020-.197") |
| Alloy Steel (4140) | 140-280 m/min (460-920 sfm) | 0.10-0.30 mm/rev (.004-.012 ipr) | 0.5-4.5 mm (.020-.177") |
Compatible Tooling Systems:
Ensure your toolholder is designed for 22-size (4-size ANSI) negative inserts:
- Heavy Duty Holders: MTJNR 2525M22 / MTJNR 3232P22 (ANSI 16-4D / 20-4E)
- Large Boring Bars: S40U-WTJNR22 / S50V-WTJNR22
Machinist Tip: Why the TNMG220404?
Scaling up your production:
Precision on Large Parts. Use this 0.4mm radius when machining large components that require a very high surface finish or when you are working with slender shafts where a larger radius would cause chatter.
Maximum Removal. Switch to the 0.8mm radius if you are performing bulk material removal or roughing. The 0.8mm edge is stronger, but the 0.4mm (this model) cuts more cleanly in fine finishing passes.
Pro Advice: Large inserts like the TNMG2204 require significant machine power and rigidity. Ensure your tool holder and spindle are in top condition to prevent harmonic vibrations during deep cuts.
Packaging: 10 pieces per box.
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