Tungsten Carbide 3 Flute Step Drill Bit with AlTiN Coating Through Coolant Holes Multi Diameter Design for Steel Titanium Inconel CNC Milling

Introduction:

Our 3-Flute Carbide Step Drill Bit revolutionizes multi-diameter hole machining with its advanced tungsten carbide construction, precision AlTiN coating, and innovative through-coolant technology. Engineered for high-speed CNC applications, this step drill combines drilling, chamfering, and countersinking in a single operation, delivering unmatched efficiency when working with hardened steels, titanium alloys, and nickel-based superalloys.

Features:

✔ Premium Tungsten Carbide Substrate – Ultra-fine grain structure (0.5μm) ensures extreme hardness (93.5 HRA) and wear resistance for machining materials up to HRC 60.

✔ 3-Flute Optimized Geometry – Provides 50% faster chip evacuation than 4-flute designs while maintaining stability in deep-hole drilling.

✔ AlTiN Nano-Coating Technology – Aluminum Titanium Nitride coating offers:

• 3,800 HV hardness (3x harder than uncoated carbide)

• 900°C oxidation resistance for dry machining capability

• Low friction coefficient reducing built-up edge (BUE)

✔ Through-Coolant Holes (2-4 Channels) – Precision coolant delivery to cutting edges:

• Reduces cutting temperature by 40% vs. standard drills

• Extends tool life by 2-3x in titanium and Inconel

✔ Multi-Diameter Step Design – Single tool replaces 3-5 conventional drills with:

• Customizable step increments (0.5mm/1.0mm)

• Included angles: 90°, 120° (standard), or custom

✔ High-Speed Ready – Balanced for 8,000-12,000 RPM operations with G2.5 dynamic balance certification.

Advantages:

▶ Time Savings – Combines drilling + chamfering in one pass, reducing cycle times by 30%

▶ Cost Efficiency – 1 tool replaces multiple drill bits + countersinks

▶ Surface Finish – Achieves Ra 0.8μm in stainless steel (vs. 1.6μm with HSS)

▶ Reliability – Manufactured to ISO 9001 standards with 100% preshipment inspection

Applications:

Aerospace

• Drilling fastener holes in titanium bulkheads (Ti-6Al-4V)

• Composite/metal stacks with 0.02mm diameter consistency

Oil & Gas

• Valve body machining in Inconel 718 and 17-4PH stainless

Medical

• Precision holes in cobalt-chrome orthopedic implants

Automotive

• High-volume drilling of hardened transmission gears (up to HRC 58)

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.