External Round Internal Hexagonal Tube | Special Shaped Steel Pipe for Precision Transmission

The External Round Internal Hexagonal Tube is a high-performance special shaped steel pipe featuring a circular outer surface combined with an internal hexagonal structure. This innovative design combines the smooth installation advantages of a round tube with the anti-rotation and high torque transmission capabilities of a hexagonal inner profile.

With high torsional strength, excellent structural stability, and precise positioning capability, this tube is widely used in applications requiring high transmission accuracy, rigidity, and resistance to deformation. It is especially suitable for agricultural machinery, mechanical manufacturing, construction decoration, and engineering equipment.

Product Details

Custom Specifications

We support full customization based on your requirements:

• Outer Diameter (Round Surface) – precision controlled for easy installation
• Internal Hexagon Size (Across Flats) – customizable for torque requirements
• Wall Thickness – available in thin wall and thick wall options
• Length – cut-to-size or bulk production
• Tolerance – high precision manufacturing available

Key Features of External Round Internal Hexagonal Tube

• High Anti-Torsion Performance
  Internal hexagonal structure ensures efficient torque transmission and prevents slipping
• Stable Structural Strength
  Maintains rigidity under heavy-duty and high-load conditions
• Smooth Outer Surface
  Round exterior improves assembly compatibility and installation efficiency
• Precision Fit & Alignment
  Ideal for applications requiring accurate positioning and tight engagement
• Strong Resistance to Deformation
  Performs reliably in demanding industrial environments

Material & Manufacturing Process

Common Materials:

• Carbon Steel Seamless Pipe
• 20# Seamless Steel Pipe
• 45# Machining Pipe
• Q355B Low Alloy Steel Pipe

Manufacturing Process:

• Cold Drawn Special Shaped Pipe
• Precision forming and calibration
• Optional surface treatments (bright, polished, anti-corrosion coating)

Applications

The External Round Internal Hexagonal Tube is widely used in:

• Agricultural machinery transmission systems
• Mechanical manufacturing components
• Engineering equipment and heavy machinery
• Construction and decorative structures
• Precision drive and connection systems