High Precision Spiral Flute Reamer H7 Carbide Reamer Bit 4mm For Steel

Solid Carbide 4mm Diameter 30mm Flute Reamer Spiral Flute  Coolant Through for CNC Machining

Product introduction: 

This high-precision solid carbide reamer features a 4mm diameter and 30mm flute length, optimized for CNC machining applications requiring tight tolerances (H5-H7) and superior surface finishes. The spiral flute design ensures efficient chip evacuation, while internal coolant channels enhance tool life and performance in hardened steels, stainless steel, and other tough alloys.

Features:

✔ Premium Solid Carbide Construction

• Micro-grain carbide substrate (K10/K20 grade) for maximum wear resistance

• Sub-micron grain structure ensures edge retention in high-speed machining

✔ Spiral Flute Design (30° Helix Angle)

• Optimized chip evacuation prevents clogging in deep-hole applications

• Reduces cutting forces for smoother finishes (Ra ≤0.4µm achievable)

✔ Through-Tool Coolant (Internal Coolant Holes)

• 2-4 precision coolant channels (Ø1.0mm) direct lubricant to cutting edges

• Supports high-pressure coolant (70+ bar) for heat dissipation in hard materials

✔ Extended 30mm Flute Length

• Ideal for deep-hole reaming (L:D ratio up to 7.5:1)

• Reduces deflection vs. standard-length reamers

✔ High-Precision Ground Edges

• H5-H7 tolerance compliance (ISO 286)

• ±0.005mm runout for ultra-precise bore finishing

Applications: 

 Aerospace

• Turbine blade cooling holes (Inconel 718)

• Hydraulic valve bodies

 Automotive

• Fuel injector nozzles

• Transmission gear bores

 Medical & Energy

• Surgical instrument precision holes

• Oil/gas valve components

 Mold & Die

• Ejector pin holes in hardened tool steel (HRC 50+)

Detailed Pictures:

Our wokshp:

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.