A 30xD solid carbide extra-deep-hole drill developed for hardened steel and hardened mold steel. Precision pilot guidance, reinforced cutting edges, through-tool internal coolant, and optimized flute geometry help control heat, evacuate chips, and maintain hole straightness over extremely long drilling depths.
The 30xD carbide drill for hardened steel is developed for highly demanding extra-deep-hole applications where material hardness, cutting heat, pilot-hole accuracy, spindle runout, long-distance chip evacuation, tool rigidity, and hole straightness must all be carefully controlled.
Compared with 15xD or 20xD drilling, a 30xD drill has a significantly longer unsupported drill body and chip evacuation path. Small errors in pilot-hole alignment, spindle condition, tool holding, coolant delivery, or initial drilling direction can become increasingly significant as the drill penetrates deeper into the workpiece.
When machining hardened steel, high cutting loads and concentrated cutting heat further increase the risk of edge chipping, chip congestion, torque fluctuations, drill bending, hole deviation, premature wear, and sudden tool breakage.
This drill is manufactured from imported MG grade 0.8 μm tungsten carbide rods with 10% cobalt content. Combined with an application-specific heat-resistant coating, reinforced cutting-edge preparation, precision drill-point geometry, extra-deep-hole flute structure, controlled core geometry, precision pilot guidance, and through-tool internal coolant, it supports stable 30xD drilling in hardened steel and heat-treated steel components.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | 30xD Carbide Drill for Hardened Steel | Drill Type | Solid Carbide Extra-Deep-Hole Drill |
| Hole Depth | 30xD | 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 structure provides the hardness, toughness, cutting-edge strength, and dimensional stability required for demanding extra-deep hardened steel drilling.
An application-specific heat-resistant coating helps protect the cutting edges and flute surfaces against concentrated cutting temperature, abrasive wear, oxidation, and premature coating failure during hardened steel machining. Controlled edge preparation helps strengthen the cutting edge and reduce micro-chipping under high drilling loads.
Accurate drill-point symmetry and cutting-edge geometry help the drill enter the pilot hole concentrically and maintain balanced cutting loads. At 30xD depth, even a small initial directional error can develop into a much larger positional deviation at the bottom or exit of the hole.
The reinforced flute and core structure balances two conflicting requirements: sufficient rigidity to resist bending and sufficient flute space for chip and coolant movement. The variable-core concept helps maintain drill strength along the extended cutting length, while adequate flute space provides a controlled route for chip evacuation.
The 30xD carbide drill for hardened steel is suitable for demanding extra-deep-hole machining in CNC machining centers and automated production systems where material hardness, pilot guidance, internal coolant, long-distance chip evacuation, and hole straightness must be carefully controlled.
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
30xD means that the drill is designed to machine a hole with a depth of up to approximately thirty times the drill diameter.
For example, a 5 mm drill may be used for a drilling depth of approximately 150 mm under suitable machining conditions.
At this depth, pilot-hole accuracy, spindle runout, internal coolant, chip evacuation, tool rigidity, and machine stability become critical process factors. The same5 mm/150 mm example is used on the current30xD product platform.
The suitable hardness range depends on drill diameter, carbide grade, coating, hole depth, pilot-hole accuracy, coolant pressure, spindle runout, machine rigidity, and cutting parameters.
Because 30xD drilling is much more demanding than short-hole drilling, maximum HRC should be confirmed through application testing rather than specified as one universal value.
30xD hardened steel drilling combines high material hardness with an extremely long unsupported drill body and chip evacuation path.
High cutting loads and concentrated heat must be controlled while chips travel through the long flute. At the same time, the tool is highly sensitive to runout, bending, pilot-hole errors, coolant instability, and machine vibration.
These factors can lead to chip packing, edge chipping, torque fluctuations, drill deflection, hole deviation, or tool breakage.
For most 30xD hardened steel applications, through-tool internal coolant should be treated as a standard requirement.
It delivers coolant directly to the cutting edge and provides the flow needed to carry chips through the extremely long flute path.
Before the long drill is fully supported by the pilot hole, the drill body has limited lateral support.
Uncontrolled entry may create radial loading, whipping, edge damage, or misalignment.
Controlled entry helps the drill engage concentrically and establish stable guidance before normal drilling begins. This controlled-entry concern is explicitly highlighted on the current30xD product page.
Spindle runout creates unequal loading between the cutting edges and can alter the drill's initial direction.
Because a 30xD hole is extremely long, a small angular deviation near the entrance may become a much larger positional error at the bottom or exit.
Low-runout tooling and stable pilot guidance are therefore especially important.
Explore Our Products
We use cookies to collect information about how you use this site. We use this information to make the website work as well as possible and improve our services.more details
