A 3xD micro solid carbide drill developed for precision small-hole drilling in hardened steel and hardened mold steel. High-precision point geometry, controlled micro-edge preparation, and a rigid short-hole design help reduce edge chipping and maintain consistent hole accuracy.
The 3xD micro carbide drill for hardened steel is developed for precision small-diameter hole machining where cutting-edge strength, tool rigidity, hole positioning, heat control, and dimensional consistency are critical.
Compared with standard-size carbide drills, micro drills are more sensitive to spindle runout, tool-holder accuracy, cutting-edge defects, unstable entry, chip congestion, and sudden cutting-load changes. When machining hardened steel, these factors can quickly cause micro-chipping, drill deflection, rapid wear, hole oversizing, or tool breakage.
The drill is manufactured from imported MG grade 0.8 μm tungsten carbide rods with 10% cobalt content. Combined with application-specific coating, controlled micro-edge preparation, German Walter 5-axis grinding, Walter Helicheck Plus inspection, and 300x magnification edge inspection, it supports stable micro-hole drilling in hardened steel and heat-treated precision components. The carbide grade and inspection processes are based on the manufacturing information shown on the existing micro-drill page.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | 3xD Micro Carbide Drills for Hardened Steel | Drill Type | Micro Solid Carbide Drill |
| Hole Depth | 3xD | Application | Precision micro-hole drilling in hardened steel |
| Workpiece Material | Hardened steel, hardened mold steel, tool steel, die steel and heat-treated alloy steel | Carbide Material | Imported MG Grade 0.8 μm Tungsten Carbide |
| Coating | ALTISIXN Wear-Resistant Coating | Cobalt Content | 10% |
| Passivation Control | Process control according to drill diameter | Tool Life | Up to 80–100 Meters Under Suitable Machining Conditions |
| Service | Regrinding and Customization Available | Available Depth Series | 3xD, 5xD, 8xD, 12xD, up to 30xD |
Key Features
Made from imported MG grade 0.8 μm tungsten carbide with 10% cobalt content.
The fine carbide grain structure provides a balance of hardness and toughness, helping support the extremely small cutting edges under the concentrated cutting loads generated during hardened steel micro-drilling. The substrate specification follows the existing micro-drill product platform.
An application-specific coating helps protect the cutting edges against high cutting temperatures, abrasive wear, oxidation, and premature coating failure.
For micro drills, coating thickness and edge coverage must be carefully controlled to avoid excessive edge rounding or reduced chip space.
The drill point and cutting edges are prepared according to the drill diameter and hardened steel application.
Controlled micro-edge preparation helps reduce microscopic chipping while retaining sufficient sharpness to limit thrust force and heat generation.
Accurate point symmetry and cutting-edge height help distribute the cutting load evenly across both cutting edges.
This reduces drill walking, uneven wear, hole enlargement, and premature breakage during small-hole machining.
The 3xD micro carbide drill for hardened steel is suitable for precision small-hole machining in CNC machining centers, high-speed machining equipment, mold manufacturing, tool and die production, electronics components, and precision mechanical parts.
Send us your material and hole requirements. Our team will recommend the right drill solution.
Landun CNC Tool is a carbide drill manufacturer focused on precision solid carbide drills and custom carbide drill solutions, supported by advanced grinding, strict inspection, and consistent edge preparation.
Production Facility
Geometry Accuracy Control
Edge Inspection Magnification
Edge Passivation Control
Our carbide drills are ground on German WALTER 5-axis grinding machines for sharp cutting edges, stable accuracy, and smooth drilling performance.
We use WALTER HELICHECK PLUS for contour inspection, keeping profile and radius control within 3 μm for reliable geometric precision.
Each carbide drill is inspected at 300x magnification to check edge quality and avoid chipping or saw-tooth defects before shipment.
Manual drill point honing and automatic rubber-bonded diamond abrasive polishing help improve tool life and control edge consistency within ±0.003 mm.
Common Questions
3xD means that the drill is designed for a hole depth of up to approximately three times the drill diameter.
For micro drills, the short 3xD structure provides better rigidity, positioning control, and resistance to drill deflection than longer drill designs.
Yes. It is developed for precision micro-hole drilling in hardened steel, hardened mold steel, tool steel, die steel, and heat-treated alloy steel within the confirmed hardness range.
Hardened steel generates high cutting forces and concentrated cutting heat.
Because a micro drill has very small cutting edges and limited chip space, minor runout, chip congestion, excessive feed, or unstable entry can quickly cause edge chipping, drill deflection, or tool breakage.
Yes. It can be used for shallow blind holes within the recommended 3xD depth.
Coolant delivery and chip evacuation must be carefully controlled to prevent chips from accumulating at the bottom of the hole.
Internal coolant versions may be available depending on the drill diameter and manufacturing feasibility.
For very small diameters, external coolant, oil mist, or another controlled coolant method may be more practical.
Peck drilling should not be applied automatically.
Excessive retracting may cause repeated impact, misalignment, or cutting-edge damage. The drilling cycle should be selected according to hole depth, chip formation, coolant delivery, and machine stability.
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