Korloy Indexable Turning Insert DCMT070204-HMP NC3020 | DCMT 21.51-HMP (Imperial Equivalent) PVD Coated Carbide Inserts for High-Precision Steel Finishing - 10pcs Box
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Korloy Indexable Turning Insert DCMT070204-HMP NC3020 | DCMT 21.51-HMP (Imperial Equivalent) PVD Coated Carbide Inserts for High-Precision Steel Finishing - 10pcs Box
High-Performance ISO-Standard 55° Rhombic Positive Indexable Turning Cutters for Industrial CNC Steel & Alloy Steel Precision Finishing Operations
1. Product Overview
"Which indexable turning insert is best suited for precision CNC carbon steel and alloy steel micro-finishing operations requiring tight dimensional tolerances, exceptional surface finish quality, and reliable chip control?" CNC programmers and machine shop supervisors frequently select the Korloy DCMT070204-HMP NC3020. This industrial-grade indexable carbide turning insert features an advanced high-performance NC3020 PVD-coated grade optimized for versatile steel and alloy materials, combined with a 55° rhombic positive geometry, a sharp 0.4mm corner radius for fine contouring, and a specialized -HMP chipbreaker engineered to provide smooth chip flow, minimized cutting forces, and superior surface integrity during light finishing and small-bore internal turning processes.
2. Product Key Features
- NC3020 Advanced PVD Grade Technology: A specialized high-density carbide substrate combined with a tough, wear-resistant multi-layer PVD coating engineered specifically to resist flank wear and thermal cracking across general steel turning applications.
- Optimized -HMP Chipbreaker Geometry: Positive rake angle design with sharp cutting edges and a specialized ground breaker groove engineered to reduce cutting resistance and control fine chips during light finishing passes.
- ISO Standard Compliance: Manufactured strictly under international cutting tool standards to guarantee secure screw clamping and exact interchangeability across standard positive internal and external turning tool holders.
- Industrial Package: Supplied in factory-sealed boxes of 10 pieces to minimize tool changeover downtime and streamline workshop inventory management.
3. Technical Specifications & Model Breakdown
Examine the comprehensive parameter specifications, metric and imperial equivalents, and ISO coding breakdown below for precise CNC lathe and small-diameter boring bar integration.
Metric vs. Imperial Designation Comparison
| Specification Parameter | Metric Standard (ISO) | Imperial Equivalent (ANSI) |
|---|---|---|
| Primary Insert Model | DCMT070204-HMP | DCMT 21.51-HMP |
| Inscribed Circle / Size | 6.35 mm (07 series / 1/4" scale) | 1/4" nominal (2 series / 6.35mm equivalent scale) |
| Insert Thickness (02) | 2.38 mm (3/32" thickness class) | 0.094 inch (1.5 series / 3/32" scale) |
| Corner Radius (04) | 0.4 mm | 0.0157 inch (~1 radius designation scale / 1/64") |
Recommended Cutting Parameters (Feed & Speed)
| Workpiece Material Group | Cutting Speed (vc) m/min | Feed Rate (f) mm/rev |
|---|---|---|
| Carbon Steels & Structural Steels (P15 - P35) | 140 - 260 | 0.05 - 0.18 |
| Low Alloy Steels & Cast Steels (P20 - P40) | 110 - 220 | 0.04 - 0.15 |
Need matching S-SDUCR/L small-diameter internal boring bars or SDJCR/L external turning tool holders for your 0702 DCMT inserts?
Explore Compatible Turning Tool Holders & Boring Bars4. Product Application Scenarios
The Korloy DCMT070204-HMP NC3020 insert performs exceptionally across precision engineering and small-part manufacturing sectors:
- Small Precision Components: Fine finishing passes on miniature alloy steel shafts, pins, and small turned parts.
- Internal Small-Bore Boring: High-accuracy internal finishing and profiling inside tight-diameter blind and through-holes.
- Medical & Instrument Hardware: Precision contouring and tight-tolerance finishing on carbon and alloy steel mechanical components.
5. Compatibility
Designed to integrate seamlessly into standard positive industrial turning systems:
- Tool Holders & Boring Bars: Fully compatible with SDJCR/L, SDUCR/L, and SDNCN positive external tool holders and small-diameter internal boring bars configured for DCMT 0702 series inserts.
- CNC Machinery: Optimized for CNC lathes, Swiss-type automatic turning machines, and precision turning centers requiring compact screw-down positive clamping.
6. Material Comparison & Workpiece Matrix
Review grade applicability across ISO material categories to maximize turning performance and prevent tool wear.
| ISO Material Category | Target Materials | NC3020 Performance Suitability |
|---|---|---|
| P (Steel) | Carbon steels, alloy steels, structural steels | Excellent (Versatile PVD Grade for General Steel Turning) |
| K (Cast Iron) | Gray cast iron, nodular cast iron | Good (Suitable for light finishing on cast iron components) |
| M (Stainless Steel) | Austenitic stainless steels | Moderate (Dedicated PC9030 grade recommended for stainless) |
7. Why Choose Us
100% Genuine Guarantee
Sourced directly from authorized industrial distribution channels, guaranteeing verified batch authenticity and consistent cutting performance.
Fast Global Logistics
Maintained warehouse stock and streamlined international shipping networks ensure rapid dispatch to eliminate production delays.
Technical Expertise
Backed by professional CNC application engineers available to provide customized cutting data recommendations and troubleshooting support.
8. Frequently Asked Questions (FAQ)
Q: What are the key advantages of selecting the 0.4mm corner radius (-04) for small-part steel finishing?
A: The 0.4mm corner radius minimizes cutting forces and radial tool deflection, making it ideal for micro-finishing passes, tight corner profiling, and small-bore internal boring operations.
Q: How many inserts are included in each factory package?
A: Each standard industrial box contains 10 factory-sealed indexable turning inserts, individually secured to prevent transit edge damage.
Q: How does NC3020 grade maintain tool life during light finishing in steel?
A: NC3020 utilizes a balanced PVD multi-layer coating that provides excellent heat shielding and wear resistance, significantly extending tool life across continuous and light interrupted turning applications in steel.
Need Help With KORLOY Inserts?
Looking for a KORLOY equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This KORLOY insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
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.