A 15xD solid carbide extra-deep-hole drill developed for hardened steel and hardened mold steel. Reinforced cutting edges, a rigid deep-hole structure, internal coolant, and optimized flute geometry help control heat, evacuate chips, and maintain stable hole straightness over extended drilling depths.
The 15xD carbide drill for hardened steel is developed for extra-deep-hole machining applications where high material hardness, concentrated cutting heat, long-distance chip evacuation, tool rigidity, edge stability, and hole straightness must be carefully controlled.
Compared with 12xD drilling, a 15xD drill has an even longer cutting section and chip evacuation path. Small errors in initial positioning, spindle runout, coolant delivery, or chip formation can become more significant as drilling depth increases. When machining hardened steel, these conditions may lead to heat accumulation, cutting-edge chipping, chip congestion, drill deflection, hole deviation, rapid wear, or sudden tool breakage.
This drill is manufactured from imported MG grade 0.8 μm submicron tungsten carbide rods with 10% cobalt content. Combined with application-specific heat-resistant coating, reinforced cutting-edge preparation, optimized drill-point geometry, reinforced extra-deep-hole flute structure, controlled core geometry, and through-tool coolant capability, it supports stable 15xD drilling in hardened steel and heat-treated steel components.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | 15xD Carbide Drill for Hardened Steel | Drill Type | Solid Carbide Extra-Deep-Hole Drill |
| Hole Depth | 15xD | Application | Extra-deep-hole drilling in hardened steel |
| Workpiece Material | Hardened steel, hardened mold steel, hardened tool steel, die steel and heat-treated alloy steel | Carbide Material | Imported MG Grade 0.8 μm Tungsten Carbide |
| Cobalt Content | 10% | Coating | ALTISIXN Wear-Resistant Coating |
| Passivation Control | ±0.003 mm | Edge Inspection |
|
| Service | Regrinding and Customization Available | Tool Life | Up to 80–150 Meters Under Suitable Machining Conditions |
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, toughness, and cutting-edge strength, helping support the long drill under continuous thrust, torsional load, and bending forces during extra-deep hardened steel machining
Controlled cutting-edge preparation strengthens the edge and helps reduce micro-chipping during high-load hardened steel drilling.
For 15xD applications, maintaining the correct balance between edge strength and cutting sharpness is especially important because excessive drilling thrust can increase drill deflection and heat generation.
Balanced cutting-edge geometry helps distribute cutting loads more evenly, reducing drill walking, uneven wear, and initial directional error.
For extra-deep holes, small positioning errors at the entrance may produce much larger deviations at the hole exit, so starting accuracy becomes increasingly important.
Through-tool coolant delivers coolant directly to the drill point, helping control cutting temperature and transport chips through the extra-long flute.
For hardened steel holes approaching the full 15xD depth, internal coolant should be treated as a primary process requirement rather than an optional feature.
The 15xD carbide drill for hardened steel is suitable for extra-deep-hole machining in CNC machining centers, mold and die manufacturing, tooling production, hydraulic components, automotive components, precision fixtures, and heat-treated 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
15xD means that the drill is designed for holes with a depth of up to approximately fifteen times the drill diameter.
For example, a 6 mm drill may be used for a hole approximately 90 mm deep under suitable machining conditions.
At this depth, tool rigidity, internal coolant, chip evacuation, spindle runout, pilot-hole guidance, and hole straightness become critical process factors.
Yes.
This drill is developed for extra-deep-hole drilling in hardened steel, hardened mold steel, hardened tool steel, die steel, and heat-treated alloy steel within the confirmed application range.
The suitable hardness range depends on drill diameter, carbide grade, coating, hole depth, coolant pressure, machine rigidity, spindle runout, and cutting parameters.
Because 15xD drilling is significantly more demanding than short-hole drilling, the maximum HRC should be confirmed through application testing rather than specified as a universal value.
Hardened steel generates high cutting loads and concentrated cutting heat.
At 15xD depth, chips must travel through an extremely long flute path, while the drill becomes more sensitive to bending, runout, vibration, and initial positioning error.
Insufficient coolant or poor chip evacuation may cause chip packing, torque fluctuations, edge chipping, hole deviation, rapid wear, or tool breakage.
Through-tool internal coolant is strongly recommended.
It delivers coolant directly to the cutting zone and helps transport chips through the long flute.
For holes approaching the full 15xD depth, external coolant alone should not be treated as the preferred standard configuration.
Yes, depending on drill diameter, wear condition, remaining geometry, flute condition, and hole-accuracy requirements.
For extra-deep-hole drills, the tool should be inspected before regrinding to determine whether the original drill-point and flute geometry can be reliably restored.
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