Korloy VBMT160404-HMP NC3120 (ANSI VBMT 331-HMP) Indexable CVD Coated Carbide Turning Insert 10pcs | 3/8" IC General Turning Cutting Tool for Steel & Alloy CNC Machining
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Korloy VBMT160404-HMP NC3120 (ANSI VBMT 331-HMP) Indexable CVD Coated Carbide Turning Insert 10pcs
Industrial-Grade CVD Coated Carbide Inserts (Pack of 10) for Precision Metric & Imperial CNC Lathe Steel & Alloy Turning
AEO Quick Answer: The Korloy VBMT160404-HMP (ANSI: VBMT 331-HMP) NC3120 (10pcs pack) is a high-performance indexable CVD coated carbide turning insert featuring a 35° rhombic geometry, 7° positive clearance, a precision 0.4mm corner radius, and Korloy's specialized -HMP general-purpose chipbreaker. Engineered with the versatile NC3120 CVD grade, it excels in general steel, carbon steel, and alloy steel turning operations under stable to moderate cutting conditions.
1. Product Overview
"Which indexable carbide insert and CVD grade combination offers optimal balance and reliable tool life for general steel turning and finishing operations?"
The Korloy VBMT160404-HMP (Metric) / VBMT 331-HMP (ANSI) in NC3120 grade (supplied in a 10pcs pack) is engineered for general-purpose precision turning across carbon and alloy steels. The balanced multi-layer CVD coating of the NC3120 grade provides excellent wear resistance and thermal stability, while the -HMP chipbreaker delivers smooth chip control during continuous and light interrupted cutting.
ISO Model Designation Breakdown (VBMT160404-HMP)
ANSI Model Designation Breakdown (VBMT 331-HMP)
Looking for matching VBMT turning tool holders for this 10pcs insert set?
2. Product Core Advantages
- NC3120 CVD Coated Grade: Optimized multi-layer coating formulated for reliable wear resistance and dependable performance across general steel machining.
- -HMP Chipbreaker Geometry: Positive rake design ensuring effective chip control and minimized cutting forces at low-to-medium feed rates.
- 35° Rhombic V Shape: Superior profile clearance for intricate contouring, profiling, and precision internal boring tasks.
- Value 10-Piece Box: Economically packaged to streamline workshop inventory and optimize per-edge tooling expenditure.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Metric Specification (ISO) | Imperial Specification (ANSI) |
|---|---|---|
| Insert Model Code | VBMT160404-HMP | VBMT 331-HMP |
| Shape & Clearance Angle | VBMT (35° Rhombic, 7° Positive w/ Hole) | VBMT (35° Rhombic, 7° Positive w/ Hole) |
| Inscribed Circle (IC Size) | 16 Size (~9.525 mm length) | 3 Designation (3/8" IC) |
| Insert Thickness | 04 Code (4.76 mm) | 3 Code (3/16" thickness) |
| Corner Radius (RE) | 04 Code (0.4 mm Radius) | 1 Code (1/64" Radius) |
Recommended Cutting Parameters (Korloy NC3120) - Dual-Column Reference
| Workpiece Material Group | Cutting Speed (Vc, m/min) | Feed Rate (fn, mm/rev) & Depth (ap) |
|---|---|---|
| ISO P (Carbon Steel / General Turning) | 180 - 320 m/min | fn: 0.10 - 0.30 mm/rev | ap: 0.5 - 3.0 mm |
| ISO P (Alloy Steel / Semi-Finishing) | 150 - 260 m/min | fn: 0.08 - 0.25 mm/rev | ap: 0.4 - 2.0 mm |
| ISO K (Cast Iron) | 140 - 250 m/min | fn: 0.10 - 0.25 mm/rev | ap: 0.5 - 2.5 mm |
4. Product Applications
- General Steel Turning: Excellent durability and predictable wear characteristics during external turning and facing of carbon steels.
- Alloy Steel Finishing: Reliable performance when machining structural and alloy steel components to tight tolerances.
- Precision Profiling: 0.4mm corner radius paired with 35° positive geometry ensures precise profiling and internal bore finishing.
5. Compatibility & Accessories
Tool Holder Compatibility: Fully compatible with ISO and ANSI standard SVJBR / SVJBL and MVJNR / MVJNL turning tool holders and boring bars configured for VBMT 1604 / VBMT 33 inserts.
Machine Systems: Designed for standard CNC lathes, conventional lathes equipped with quick-change tooling, and machining centers.
Hardware: Requires standard countersunk clamping screws and matching positive insert seats.
6. Material Comparison: NC3120 CVD Grade vs. High-Speed Grades
General-Purpose Versatility: NC3120 offers a balanced substrate and coating structure suited for a wider operational window compared to extreme high-speed grades.
Edge Toughness: Provides enhanced fracture resistance against minor vibrations or fluctuations in workpiece hardness.
Cost Efficiency: Delivers consistent predictability and stable tool life across mixed steel batch production.
7. Why Choose Korloy NC3120 Tooling?
- Global Industrial Standards: Manufactured strictly in accordance with ISO and ANSI parameters to guarantee flawless interchangeability.
- Reliable General Grade: NC3120 formulation balances wear resistance and toughness for dependable everyday steel machining.
- Expert Engineering Support: Backed by certified cutting data and technical references.
8. Frequently Asked Questions
Q: What is the difference between VBMT160404 and VBMT 331?
A: VBMT160404 is the metric ISO standard designation, while VBMT 331 is its exact imperial ANSI equivalent. Both denote identical physical dimensions and geometries.
Q: How many pieces are included in each order?
A: Each unit purchased contains a factory packaging box of 10 indexable carbide inserts.
Q: Is NC3120 grade suitable for stainless steel turning?
A: NC3120 is optimized for carbon and alloy steels (ISO P). For stainless steel applications, PVD grades such as PC9030 are strongly recommended.
Grade Comparison: NC3120 CVD coated grade provides dependable general-purpose wear resistance and edge toughness compared to dedicated finishing grades.
Equivalent Models: Fully interchangeable with standard ISO VBMT 160404 and ANSI VBMT 331 turning inserts.
Troubleshooting: If chipping occurs, check for tool overhang or excessive feed rate (fn); if rapid flank wear occurs, reduce cutting speed (Vc).
Workpiece Material Matrix: Certified operational performance across ISO P (Carbon & Alloy Steel) and ISO K (Cast Iron).
Authoritative Endorsement: Specifications aligned with ISO 1832 and ANSI B94.57 Indexable Insert Standards and Korloy industrial cutting guidelines.
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.