A Step Drill is a multi-diameter drilling tool that produces two or more hole sizes in a single operation, reducing tool changes and improving positional consistency between steps. Aoshiji® Custom Tool supports custom step drill geometry for CNC production drilling where cycle time, burr control, and repeatable hole quality are critical.
The Step Drill is designed for efficient holemaking when a part requires a pilot diameter followed by one or more larger diameters, shoulders, or lead-in features. By integrating multiple diameters into one tool, a step drill can reduce cycle time, simplify programming, and help maintain coaxiality between hole sections. Customization covers step diameters, step lengths, point geometry, chip evacuation strategy, and optional chamfering or countersinking features depending on the application.
Step drilling for sheet metal and plate components requiring multiple hole sizes
Pre-drill and finish drilling sequences consolidated into a single tool
Automotive and EV components with stepped bores for fasteners, bushings, or locating features
Fixture plates, brackets, housings, and manifold-style parts requiring shoulder holes
Non-ferrous machining where chip control and edge quality are priorities
High-volume CNC production where reduced tool changes improve throughput
Multi-diameter cutting edges to produce stepped holes in one pass
Custom step geometry to match print requirements for diameters and step lengths
Optimized point design options for stable entry and reduced burr formation
Flute and helix choices to balance chip evacuation and tool rigidity
Optional coolant-through design to improve chip removal and heat control
Coating options matched to workpiece material and cutting conditions
Fewer tools and fewer tool changes to reduce cycle time
Improved concentricity between steps compared with separate drilling operations
More stable dimensional repeatability across production runs
Cleaner transitions between diameters with reduced secondary deburring
Simplified setup and lower risk of mismatch between pilot and finish drills
| Parameter | Specification |
|---|---|
| Tool Type | Step Drill |
| Tool Category | Multi-Diameter Drilling Tool |
| Tool Material | Solid Carbide, Coated Solid Carbide, Brazed Carbide, Brazed PCD, Brazed CBN, Solid HSS, Brazed HSS |
| Step Configuration | 2-Step, 3-Step, Multi-Step (Custom) |
| Primary Diameter (D1) | Custom |
| Secondary Diameter (D2) | Custom |
| Additional Diameters (D3+) | Custom |
| Step Lengths (L1, L2, L3…) | Custom |
| Point Type | Split Point, Conical Point, Custom |
| Point Angle | Custom |
| Margin / Land | Custom |
| Flute Type | Helical Flute, Straight Flute (Custom) |
| Helix Angle | Custom |
| Number of Flutes | Custom |
| Coolant Supply | Through Coolant, External Coolant, Dry |
| Cutting Direction | Right-Hand (Left-Hand Optional) |
| Shank Type | Cylindrical, Weldon Flat, Custom |
| Overall Length | Custom |
| Surface Treatment / Coating | Uncoated, TiAlN, AlCrN, DLC, Custom |
| Applicable Materials | Aluminum, Steel, Stainless Steel, Cast Iron, Non-Ferrous Alloys, Plastics (Application-Dependent) |
| Typical Use | Step Drilling, Hole Sizing, Shoulder Hole Production |
Step drill with integrated chamfer or countersink at the final diameter
Coolant-through step drill for deep step drilling and improved chip evacuation
Reinforced core design for long overhang and higher stability
Custom flute count and helix to match material and chip behavior
Edge preparation and hone level tailored for burr control or tool life
Tolerance targeting and inspection reporting based on customer requirements
Toolholder interface customization for specific CNC setups
Send your drawing or specify D1/D2 (and additional diameters), step lengths, material, hole depth, machine type, coolant method, and target tolerance.
We will recommend a step drill configuration aligned to your cycle-time and hole-quality goals.For technical consultation or a quotation, please contact:
[email protected]
Related machining solutions and tools commonly used for multi-diameter drilling, stepped hole generation, and reduced tool-change drilling operations include:
2-Flute PCD Step Reamer Head with Entrance Chamfer
PCD Tapered Form Drill – Flat-Bottom
PCD Countersink
Multi-Stage PCD Combination Tool
Custom PCD Cutting Tools
