4 Flute Coolant Through Step Drill for 304 316L Steel AlTiN Coated Carbide Reamer with Internal Cooling Channels

Introduction:

Our premium 4-flute coolant-through step reamer is specifically engineered for high-performance machining of austenitic stainless steels (304/316L). Featuring advanced AlTiN coating and optimized internal coolant channels, this carbide tool delivers superior hole quality and extended tool life in these notoriously gummy, work-hardening materials.

The unique step drill design combines drilling and reaming operations into one efficient process, significantly reducing cycle times while maintaining IT6-IT7 grade tolerances. Ideal for medical, food processing, and marine applications where 304/316L stainless steels' corrosion resistance is critical.

Features:

1. Specialized Tool Geometry

• 4-flute design with 35° helix angle for optimal chip evacuation

• Polished flute surfaces prevent material adhesion in gummy steels

• Step configuration enables combined roughing/finishing in one pass

2. Advanced Material Technology

• Sub-micron tungsten carbide (0.5μm) for maximum edge stability

• AlTiN nano-coating with enhanced lubricity for stainless steels

• Through-tool coolant (2-4 ports) for effective heat management

3. Documented Performance Advantages

✓ 4× longer life vs standard HSS reamers in 316L
✓ Ra 0.8μm surface finish achievable
✓ 30% higher feed rates through optimized chip breakers
✓ Eliminates built-up edge (BUE) common with stainless

4. Customization Options

• Diameter range: 3-20mm (0.118"-0.787")

• Step configurations: 2-3 steps per tool

• Shank options: Straight, Weldon, hydraulic

• Special features: Left-hand spiral, reduced neck

Applications:

Medical Device Manufacturing

• Surgical instrument precision holes

• Implant component through-holes

Food Processing Equipment

• Valve body machining

• Mixing shaft bearing seats

Marine & Chemical Systems

• Pump housing bores

• Heat exchanger tube plates

General Precision Engineering

• Hydraulic component finishing

• Bearing housing precision bores

Detailed Pictures:

Our workshop:

Promotion policy:

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!

Other products:

FAQ:

1. Are you a manufacturer or trading company?

We are a professional manufacturer of carbide tools which established in 2017.

2. Which CNC grinding machine do you use?

All of our carbide tools are produced by imported WALTER grinding machines.

3. Which shipping method do you usually use?

We usually send goods by express like FedEx, UPS, DHL, TNT, EMS, ETC.

We also can send products to your shipping agent in China.