A rigid 5xD solid carbide drill developed for medium-depth drilling in hardened steel and hardened mold steel. Reinforced cutting edges, heat-resistant coating, and optimized flute geometry help improve chip evacuation, hole straightness, and drilling stability.
The 5xD carbide drill for hardened steel is developed for medium-depth drilling applications where high material hardness, concentrated cutting heat, chip evacuation, edge chipping, and hole deviation can affect machining stability.
Compared with a 3xD short-hole drill, a 5xD drill has a longer cutting section and must maintain sufficient rigidity while continuously evacuating chips from a deeper hole. When machining hardened steel, inadequate flute design or coolant delivery may cause heat accumulation, chip congestion, unstable cutting loads, rapid edge wear, or drill breakage.
This drill is manufactured from imported MG grade 0.8 μm submicron tungsten carbide rods with 10% cobalt content. Combined with a heat-resistant coating, reinforced cutting-edge preparation, optimized point geometry, variable core design, and internal or external coolant options, it supports stable medium-depth drilling in hardened steel and heat-treated steel components.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | 5xD Carbide Drill for Hardened Steel | Drill Type | Solid Carbide Drill |
| Hole Depth | 5xD | Application | Medium-depth hardened steel drilling |
| 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 |
| Cobalt Content | 10% | Helix Angle | 30° |
| Point Angle | 138.9° | Rake Angle | Application-Specific Geometry |
| Negative Chamfer | Reinforced Edge Chamfer | Core Design | 30–40% Variable Core Diameter |
| Back Taper | 0.8° | Coating | ALTISIXN Wear-Resistant Coating |
| Coating Hardness | 2000–4000 HV | Friction Coefficient | 0.05–0.15 |
| Coolant Type | Internal Coolant / External Coolant Available | Tool Life | Up to 80–100 Meters Under Suitable Machining Conditions |
| Service | Regrinding and Customization Available |
| Drill Diameter (mm) | Flute Length (mm) | Shank Diameter (mm) | Overall Length (mm) | Hole Depth | Coolant Type | Availability |
|---|---|---|---|---|---|---|
| D3.00-D3.90 | 28 | 6 | 66 | 5xD | Internal / External | Standard |
| D4.00-D4.70 | 36 | 6 | 74 | 5xD | Internal / External | Standard |
| D4.80-D6.00 | 44 | 6 | 82 | 5xD | Internal / External | Standard |
| D6.10-D8.00 | 53 | 8 | 91 | 5xD | Internal / External | Standard |
| D8.10-D10.0 | 61 | 10 | 103 | 5xD | Internal / External | Standard |
| D10.1-D12.0 | 71 | 12 | 118 | 5xD | Internal / External | Standard |
| D12.1-D14.0 | 77 | 14 | 124 | 5xD | Internal / External | Standard |
| D14.1-D16.0 | 83 | 16 | 133 | 5xD | Internal / External | Standard |
| D16.1-D18.0 | 93 | 18 | 143 | 5xD | Internal / External | Standard |
| D18.1-D20.0 | 101 | 20 | 153 | 5xD | Internal / External | Standard |
Key Features
Made from imported 0.8 μm submicron tungsten carbide with 10% cobalt content for a balanced combination of hardness, toughness, and cutting-edge strength.
The carbide substrate helps support the cutting edges under the higher thrust forces and concentrated cutting loads generated during medium-depth hardened steel drilling.
The self-developed high-performance coating helps resist cutting heat, abrasive wear, oxidation, and premature coating breakdown during hardened steel machining.
Controlled edge passivation and reinforced edge preparation help reduce micro-chipping while maintaining sufficient cutting sharpness and stable penetration.
The optimized drill point supports accurate positioning and stable entry into hardened workpiece surfaces.
A balanced point design helps distribute cutting loads across both cutting edges, reducing drill walking, localized edge damage, and uneven hole enlargement.
The variable core structure provides additional tool rigidity while maintaining sufficient flute space for chip evacuation.
This design is especially important for 5xD drilling, where the longer cutting section must resist deflection and maintain hole straightness under continuous cutting loads.
This 5xD carbide drill for hardened steel is suitable for medium-depth hole machining in CNC machining centers, mold manufacturing, tool and die production, automotive component manufacturing, and precision mechanical machining.
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
5xD means that the drill is designed to produce holes with a depth of up to approximately five times the drill diameter. For example, a 6 mm drill can machine a hole approximately 30 mm deep under suitable machining conditions.
Yes. This drill is developed for medium-depth drilling in hardened steel, hardened mold steel, tool steel, die steel, and other heat-treated steel materials within the confirmed hardness range.
The recommended hardness depends on the carbide grade, coating, drill diameter, hole depth, coolant condition, machine rigidity, and cutting parameters.
A typical target range is HRC 45–55. Applications approaching HRC60 should be evaluated according to the actual steel grade and machining conditions before batch production.
A 3xD carbide drill is mainly used for shallow and short holes, providing higher rigidity and easier chip evacuation.
A 5xD drill is designed for deeper holes and requires stronger flute performance, improved coolant delivery, better hole-straightness control, and more stable resistance to drill deflection.
Hardened steel produces high cutting forces and concentrated cutting heat. A general-purpose drill may experience rapid flank wear, edge chipping, coating failure, unstable positioning, or tool breakage.
A suitable hardened-steel drill requires a rigid carbide substrate, reinforced cutting edges, heat-resistant coating, stable point geometry, and controlled chip evacuation.
Yes. Internal coolant is strongly recommended for blind holes, larger drill diameters, higher material hardness, and continuous production.
It helps cool the drill point, reduce heat accumulation, and evacuate chips from the bottom of the hole.
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