Ultra‑Lightweight Rigidity 3K Square Carbon Fiber Tubes | Custom Sizes & High‑Strength
Ultra‑Lightweight Rigidity 3K Square Carbon Fiber Tubes | Custom Sizes & High‑Strength
The square carbon fiber tube is a hollow structural profile with a square/rectangular cross-section, fabricated by pultrusion or compression molding. It employs continuous carbon fiber (T300/T700 grade) as reinforcement and epoxy resin as the matrix. Compared to round tubes, it offers 40% higher torsional rigidity, planar mounting stability, and sub-millimeter dimensional accuracy – making it ideal for modular systems like robotic arms, drone frames, and optical platforms.
Our high-strength square carbon fiber tubing is fabricated with unidirectional (UD) carbon fiber prepreg. Unlike metal tubing, carbon fiber tubing is designed with layers of fibers oriented at different angles to provide properties designed for a specific application. A variety of types or grades of carbon fiber tubing are available, as well as various exterior materials.
- Square Carbon Fiber Tubes deliver ultra‑lightweight rigidity and precise custom sizing for high‑performance applications.
- Highlights: ±0.1 mm tolerance, UV‑resistant finish, corrosion‑proof surface.
- Advantages: 50 % lighter than aluminum, 4× higher stiffness, maintenance‑free.
- Ideal for structural frames, robotic arms, and camera supports—boosting strength and efficiency.
Materials & Manufacturing
Fiber Systems
- Standard: T300 12K unidirectional + 3K twill outer layer (visible carbon weave)
- High-Strength: T700 12K full unidirectional, 18% higher modulus
- High-Modulus: M40J 6K hybrid layup for precision optical beams
Resin Systems
- Standard epoxy: Operating temp. -40℃ to 120℃
- High-temp epoxy: T<sub>g</sub> 180℃, short-term resistance to 200℃
- Flame-retardant epoxy: UL94-V0 for UAV battery trays/rail transit
Processes
- High-temp pultrusion: Seamless 3–6m lengths, straightness ≤0.2mm/m
- Vacuum compression molding: Dimensional tolerance ±0.05mm
- Secondary CNC machining: Milling slots, drilling, threading, aluminum inserts
Surface Finishes
- 3K twill + matte/gloss UV coating
- Matte black PU paint (non-reflective for optics)
- Anodized inner walls for adhesive bonding
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.