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High-Performance Carbon Fiber Tubes: Precision Engineering by CQDJ
- Overview
- Recommended Products
In the world of advanced materials, the difference between "good" and "indestructible" lies in the manufacturing process. At CQDJ, we don’t just sell carbon fiber tubes; we engineer high-strength, lightweight solutions tailored to the rigorous demands of aerospace, robotics, marine, and industrial automation.
As a factory-direct manufacturer, CQDJ eliminates the middleman, providing you with aerospace-grade quality at industrial-scale pricing.
Technical Specifications & Mechanical Data
At CQDJ, we use high-grade epoxy resins and premium carbon fiber to ensure our tubes meet international standards. Below are the typical performance metrics for our standard modulus (24T) and high modulus (30T+) tubing.
1. Material Physical Properties
| Property | Metric Value | Imperial Value |
| Density | 1.55 - 1.60g/cm³ | 0.056 - 0.058 lb/in³ |
| Fiber Volume Fraction | 60% - 65% | 60% - 65% |
| Thermal Conductivity | 5 - 7 W/m·K | 2.9 - 4.0 BTU/hr·ft·°F |
| CTE (Thermal Expansion) | —0.1 to 0.5 x 10-6/°C | -0.05 to 0.2 x 10-6/°F |
| Service Temperature | Up to 120°C(Standard) | Up to 248°F |
2. Mechanical Performance (3K Roll-Wrapped Tube)
The following data represents the typical strength of our T700-grade carbon fiber tubes:
Tensile Strength: ≈ 3500 MPa
Tensile Modulus: ≈ 230 GPa
Flexural Strength: ≈ 1800 MPa
Compressive Strength: ~ 1500 MPa
3. Dimensional Tolerances
Our factory-honed precision allows us to achieve industry-leading tolerances:
Outer Diameter (OD): ±0.05mm to 0.1mm
Inner Diameter (ID): ±0.03mm
Wall Thickness: ±0.05mm
Straightness: ±< 0.1mm per meter
Engineering Support: Beyond the Tube
We understand that every project has unique stress requirements. CQDJ offers FEA (Finite Element Analysis) consulting to help you determine the optimal layup for your specific load cases.
Unidirectional (UD) Layers: Maximizes longitudinal stiffness for bending resistance.
±45°Layers: Increases torsional (twisting) rigidity and shear strength.
90°(Hoop) Layers: Prevents crushing and improves internal pressure resistance.
Factory Insight: We can also incorporate Aramid (Kevlar) or Glass Fiber layers to create hybrid tubes that balance impact resistance with carbon fiber's extreme stiffness.
Carbon fiber tube specification
| Specification | Roll-Wrapped (High Strength) | Pultruded (Cost-Effective) | Filament Wound (Torsional) |
| Fiber Orientation | Multi-axial (0∘,45∘,90∘) | Longitudinal (0∘) | High-angle Helical |
| Strength Focus | Bending & Hoop Strength | Linear Tensile Strength | Torsional (Twist) Rigidity |
| Common Uses | UAVs, Robotics, Luxury Goods | Support Rods, Tent Poles | Driveshafts, Heavy Industrial |
| Surface Finish | 3K Twill/Plain/Glossy/Matte | Smooth/Natural | Textured/Machined |
| Parameter | Standard Range | Precision Tolerance |
| Outer Diameter (OD) | 2mm to 500mm | ±0.05mm |
| Inner Diameter (ID) | 1mm to 480mm | ±0.03mm |
| Wall Thickness | 0.5mm to 20mm+ | ±0.05mm |
| Length | Up to 6,000mm | ±1.0mm |
PACKING AND STORAGE
Step 1: Surface Protection: Each tube is individually sleeved in PE (polyethylene) bags or non-scratch pearl cotton to prevent surface scuffs or resin chipping.
Step 2: Shock Absorption: For thin-walled or high-precision tubes, we use bubble wrap or expanded polystyrene (EPS) spacers to eliminate movement during transit.
Step 3: Rigid Internal Support: Long tubes (over $2000\text{mm}$) are packed with internal support structures or placed inside high-density cardboard cylinders to prevent bending or "whipping" during handling.
Step 4: Industrial Outer Casing: Small/Medium Orders: Reinforced 7-layer corrugated "Double-Wall" boxes. Large/Bulk Orders: Custom-built fumigated wooden crates or plywood boxes (compliant with ISPM-15 standards for international shipping).
Shipping & Lead Times
Stock Items: Dispatched within 24–48 hours.
Custom Fabrication: Typically 7–15 working days, depending on the complexity of CNC machining or layup.
