Internal Coolant Step Drill for Aluminum Carbide Multi Diameter Drill Bit with Coolant Holes

Introduction:

This high-performance carbide step drill is specifically designed for aluminum machining, featuring internal coolant channels and a multi-diameter design to streamline drilling, chamfering, and deburring in a single operation. Engineered for CNC machining centers, it delivers superior chip evacuation, reduced heat buildup, and extended tool life—ideal for high-volume aluminum production.

Features:

Internal Coolant Channels (Through-Tool Cooling)

• 2-4 precision coolant holes (Ø1.0-1.5mm) for direct lubrication

• Reduces heat & prevents built-up edge (BUE) in sticky aluminum alloys

Multi-Diameter Step Design

• Integrated diameter transitions (e.g., 6mm → 8mm → 10mm)

• Eliminates tool changes for drilling + chamfering in one pass

Optimized for Aluminum

• Polished flutes minimize chip adhesion

• 3-4 flute spiral design (30°-45° helix) for smooth chip evacuation

Solid Carbide Construction

• Micro-grain carbide (K30/K40 grade) for wear resistance

• Sub-micron grain structure ensures edge sharpness

High-Speed CNC Ready

• • Balanced geometry reduces vibration at 15,000+ RPM

  • h6 tolerance shank for precision collet/chuck mounting

Advantages:

40% Faster Machining – Combines drilling + chamfering operations

2X Longer Tool Life vs. HSS drills (no edge welding in aluminum)

Mirror Finishes (Ra ≤0.8µm) with polished flutes

No Chip Clogging – Coolant + spiral flutes clear chips efficiently

Application:

Electronics

• Heat sink mounting holes (6061/6063 aluminum)

• PCB fixture plates

Automotive

• Lightweight engine blocks (A380 die-cast aluminum)

• Battery tray drilling

Aerospace

• Aircraft structural components (7075-T6)

• Drilling + chamfering in thin-wall parts

General Machining

• Multi-diameter holes in aluminum extrusions
• Deburring soft alloy castings

Detailed Pictures:

Our workshop:

New Customer Special Offers:

To help you experience our premium products, we’re excited to offer the following exclusive promotions for first-time buyers:

1.Free Test Samples

Get free samples (total value ≤ $20 USD) when you cover the international shipping cost.

Perfect for evaluating our product quality and performance risk-free.

2.$50 USD Discount on First Order

New customers can enjoy a $50 discount on the first order of $500 or more.

A great way to start our partnership with extra value!

Our advantages:

1.Advanced grinding machines: All of our grinding machines are WALTER and SAACKE brands.

2.Advanced inspection machines: We have ZOLLER, OMEGA, PG1000, etc. For inspecting each carbide tools.

3.Fast feedback: we offer 24 hours online service

4.Strict quality control system:
We strictly adhere to a three-stage inspection process for each tool:
Raw material inspection
Semi-finished product inspection after production
Final inspection after coating (pre-shipment check)

Related products:

  CHANGZHOU AMG PRECISION TOOL MANUFACTURING CO., LTD. is a leading manufacturer and solution provider specializing in high-performance carbide cutting tools for precision CNC machining applications. With a strong commitment to innovation and quality, we design and produce an extensive range of standard and custom cutting tools, including carbide drill bits, end mills, reamers, and complex non-standard forming tools tailored to meet the most demanding machining challenges.