Designed for efficient stepped-hole and multi-diameter hole machining, this solid carbide step drill combines multiple drilling operations in one tool. Precision-ground step diameters, imported MG grade 0.8 μm carbide, controlled cutting-edge preparation, and material-specific coating options help reduce tool changes, improve hole concentricity, shorten cycle time, and maintain consistent dimensional accuracy in batch production.
The carbide step drill is designed to machine two or more hole diameters, depths, or profiles in a single drilling operation. It can combine pilot drilling, hole enlargement, counterboring, chamfering, and stepped-hole machining into one customized cutting tool.
In conventional machining, producing a stepped hole may require several separate tools, such as a pilot drill, standard drill, counterbore, and chamfering tool. Multiple tool changes increase cycle time and may introduce positional errors between different hole features.
A precision-ground carbide step drill completes these operations with one tool. Because the different cutting diameters are ground on the same carbide blank, the relationship between the pilot diameter, larger step diameter, step length, and shoulder geometry can be controlled more consistently.
The integrated design helps improve concentricity between different hole diameters, reduce tool-change time, simplify CNC programming, and improve repeatability in batch production.
This step drill is manufactured from imported MG grade 0.8 μm tungsten carbide with 10% cobalt content. German Walter 5-axis grinding, controlled edge preparation, Walter Helicheck Plus measurement, and 300x cutting-edge inspection help maintain step accuracy, cutting-edge quality, and stable machining performance.
| Item | Description | Item | Description |
|---|---|---|---|
| Product Name | Carbide Step Drill | Alternative Name | Solid Carbide Step Drill / Stepped Drill Bit |
| Drill Type | Custom or Standard Solid Carbide Step Drill | Step Configuration | Two-step or multi-step geometry available |
| Edge Inspection | 300x magnification appearance inspection | Carbide Material | Tungsten Carbide |
| Edge Preparation Control | ±0.003 mm | Coating | Custom Coating |
| Inspection Equipment | German Walter Helicheck Plus | Workpiece Material | Steel, stainless steel, cast iron, aluminum, titanium alloy, and selected non-ferrous materials |
| Coolant Type | Internal Coolant / External Coolant Available | Main Application | Multi-diameter holes, stepped blind holes, counterbores, bolt seats, bearing seats, and custom hole profiles |
| Service | Regrinding and Customization Available | Size Availability | Standard and customized diameters available |
Key Features
Multiple cutting diameters are ground on the same solid carbide blank.
The integrated design allows the drill to create different hole diameters and depths in one operation, reducing separate drilling, counterboring, and chamfering processes.
Because each step is produced on the same tool axis, the positional relationship between the pilot hole and larger hole diameter can be controlled more consistently.
This helps improve concentricity, shoulder position, and dimensional repeatability compared with using several independent tools.
The drill is manufactured from imported MG grade 0.8 μm tungsten carbide with 10% cobalt content.
The fine carbide structure helps provide the rigidity, edge strength, and dimensional stability required for multi-diameter cutting and batch stepped-hole machining.
The flute geometry is designed according to the number of steps, cutting diameter, hole depth, and workpiece material.
Sufficient chip space and smooth flute surfaces help remove chips from both the pilot section and larger cutting step, reducing chip accumulation and cutting-load fluctuation.
Carbide step drills are suitable for CNC machining centers, drilling machines, transfer lines, automated equipment, and high-volume component manufacturing. They are especially useful when several related hole features must maintain concentricity and be completed efficiently in one machining cycle.
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
A carbide step drill is a solid carbide tool with two or more cutting diameters. It is designed to produce stepped holes or combine several drilling operations in one machining cycle.
A step drill can combine pilot drilling, standard drilling, hole enlargement, counterboring, countersinking, chamfering, or the machining of stepped blind holes.
The main advantage is that several related hole features can be machined with one tool. This reduces tool changes, shortens cycle time, simplifies programming, and improves concentricity between hole diameters.
Yes. Two-step and multi-step designs can be manufactured according to the component drawing and machining requirements.
Yes. Each step diameter, cutting length, shoulder position, flute length, shank diameter, and overall length can be customized.
Yes. A customized shoulder angle can create a chamfer or countersink while the drill produces the main hole.
Yes. It can produce stepped blind holes when the step depths, drill-point allowance, chip space, and bottom geometry are properly designed.
All cutting diameters are ground on the same carbide blank and share the same tool axis. This helps maintain more consistent alignment between the pilot hole and larger hole sections.
Yes. We can evaluate the current tool drawing, sample, model number, or machining result and develop a corresponding replacement solution.
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