Korloy VNMG160404-HM NC3020 (ANSI VNMG 331-HM) CVD Double-Sided Insert for Steel (10pcs)
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The Original Korloy VNMG160404-HM NC3020 (ANSI Cross Reference: VNMG 331-HM) is a highly efficient 35° Rhombic Negative Insert designed for General Purpose Steel Turning. Utilizing the dual-sided strength of the VNMG geometry, this insert offers four precision cutting edges for maximum economy. The NC3020 CVD Grade provides a thick alumina layer for superior heat resistance, while the HM (Harmony Medium) chipbreaker ensures excellent chip control across a wide range of feed rates and depths of cut.
High-Speed Stability: The NC3020 grade is optimized for continuous cutting at elevated surface speeds. Its multi-layer CVD coating acts as a robust thermal barrier, preventing plastic deformation of the 35° sharp tip during long profiling cycles.
Technical Specifications (Metric & ANSI):
| ISO Designation | VNMG 160404-HM |
| ANSI Designation | VNMG 331-HM |
| Inscribed Circle (IC) | 9.525 mm / (3/8") |
| Thickness (S) | 4.76 mm / (3/16") |
| Corner Radius (r) | 0.4 mm / (1/64") |
| Grade | NC3020 (Premium CVD Coated) |
| Application | Carbon Steel, Alloy Steel (P15 - P30) |
Core Performance Benefits:
- 4 Cutting Edges: Unlike positive V-inserts (VCMT/VBMT), the negative VNMG geometry allows you to use both sides of the insert, effectively doubling your tool life per insert.
- HM Chipbreaker: Designed with a balanced rake angle to provide a "Harmony" between edge strength and sharpness. Excels at medium depths of cut (1.0mm - 3.0mm).
- TiCN + Al2O3 Coating: This premium CVD combination offers extreme wear resistance and prevents cratering during high-speed production.
- Precise 0.4mm Radius: Ideal for creating fine surface finishes and accessing tight corners in complex profiling applications.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) |
|---|---|---|---|
| Mild Steel (1018/1045) | 150 - 350 m/min | 0.10 - 0.25 mm/rev | 0.5 - 3.0 mm |
| Alloy Steel (4140/8620) | 120 - 280 m/min | 0.08 - 0.22 mm/rev | 0.5 - 2.5 mm |
Compatible Tool Holders:
- External Turning: MVJNR / MVVNN / DVLNR Series (Size 16)
- Internal Boring Bars: S32U-MVQNR16 / S40V-MVUNR16
Machinist Tip: Maximizing VNMG Utility
The HM chipbreaker is very versatile, but it performs best when the depth of cut is greater than the corner radius (0.4mm). For very light finishing cuts, consider a "VF" (Finishing) chipbreaker.
Negative inserts like VNMG require a rigid setup. Ensure your workpiece and holder are secure to avoid vibration, especially when profiling with the full length of the 35° edge.
Packaging: 10 pieces per box.
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