Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube
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Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural TubeCarbon Fiber Square Tube with Round Bore – 500mm Hollow Structural TubeCarbon Fiber Square Tube with Round Bore – 500mm Hollow Structural TubeCarbon Fiber Square Tube with Round Bore – 500mm Hollow Structural TubeCarbon Fiber Square Tube with Round Bore – 500mm Hollow Structural TubeCarbon Fiber Square Tube with Round Bore – 500mm Hollow Structural TubeCarbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube

Carbon Fiber Square Tube with Round Bore – 500mm Hollow Structural Tube

HomeDIYer
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By HomeDIYer®

Price:
$62.68 USD
Stock:
In stock (500 units), ready to be shipped

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Description

Carbon Fiber Square Tube with Round Bore — Lightweight Structural Hollow Tube for Precision Builds

When your project demands a structural tube that won't add unnecessary weight or corrode in demanding environments, standard aluminum or steel profiles often fall short. Engineers, RC hobbyists, robotics builders, and drone frame designers rely on carbon fiber square hollow tubes to deliver exceptional rigidity in a fraction of the mass — and this carbon fiber square tube with round bore is built exactly for those applications.

Each tube measures 500mm (≈19.7") in length with a square outer profile and a precision round inner bore. Outer dimensions range from 1.4×1.4mm (0.8mm bore) up to 12×12mm (9.5mm bore), with wall thicknesses from 0.8mm to 9.5mm depending on the variant selected. Available in pack quantities of 1, 2, 3, 5, 8, or 10 pieces per order (quantity options vary by size).

Typical use cases include drone arm spars and frame rails where a lightweight carbon fiber hollow tube reduces all-up weight, robotics linkage rods and structural cross-members requiring a stiff square profile, and RC car chassis rails or antenna mounts where a corrosion-resistant square carbon tube outperforms metal alternatives in humid or outdoor conditions.

⚠️ Size confirmation: The round inner bore diameter is listed alongside each outer size (e.g., "4 × 4 – 2.5mm" = 4mm square outer, 2.5mm round bore). Verify both dimensions against your design before ordering. Contact us if you need clarification.
✅ Compatible with standard metric rods, cables, and bonded metal inserts. Suitable for drone frames, robotics, RC builds, and lightweight structural assemblies. Cut-to-length with carbide or diamond blade.

✅ Key Features of These Carbon Fiber Square Hollow Tubes

  • ⚖️Exceptional Strength-to-Weight Ratio — Carbon fiber composite delivers high flexural stiffness at a fraction of the weight of aluminum square tube, making it ideal for weight-sensitive drone frame and robotics builds.
  • 🔲Square Outer Profile with Round Inner Bore — The square exterior provides flat mating surfaces for brackets and clamps, while the round bore accommodates metric rods, cables, or bonded inserts without additional machining.
  • 📏Wide Size Range in One Listing — Outer widths from 1.4mm to 12mm with matching bore diameters from 0.8mm to 9.5mm let you source the exact carbon fiber hollow tube size your project requires without hunting across multiple suppliers.
  • 🌧️Corrosion-Resistant Construction — Carbon fiber composite does not rust or oxidize, making these square tubes suitable for outdoor RC builds, marine-adjacent environments, and humid workshop conditions where metal profiles would degrade.
  • ✂️Machinable and Bondable — Cuts cleanly with a fine-tooth carbide blade and bonds reliably with structural epoxy or CA glue, supporting custom-length cuts and end-cap or insert installations for threaded connections.
  • 📦Flexible Pack Quantities — Order as few as 1 piece for prototyping or up to 10 pieces for production runs, with per-unit cost scaling as quantity increases — useful for multi-arm drone frames or batch robotics builds.

📐 Technical Specifications — Carbon Fiber Square Tube

Material Carbon fiber composite (woven or pultruded construction)
Outer Profile Square cross-section
Inner Bore Round (centered)
Outer Width Range 1.4mm – 12mm (see variant options)
Inner Bore Diameter Range 0.8mm – 9.5mm (matched to outer size)
Length 500mm (≈19.7")
Wall Thickness Varies by size — see variant options
Surface Finish Black resin-coated exterior
Color Black
Pack Quantity Options 1 / 2 / 3 / 5 / 8 / 10 pcs (availability varies by size)
Tensile / Flexural Strength Contact us to confirm for your specific variant
Thread Compatibility Use bonded metal inserts for threaded connections
Recommended Cutting Tool Fine-tooth carbide or diamond-coated blade

❓ Frequently Asked Questions

How do I choose the right size carbon fiber square tube?

Match the outer width to your channel, slot, or bracket dimension. The round inner bore diameter is listed alongside each size — for example, "4 × 4 – 2.5mm" means a 4mm square outer profile with a 2.5mm round bore. The fixed length is 500mm (≈19.7"). If you need a tube that fits inside a 6mm slot, choose the 6×6 variant and confirm the bore suits your rod or cable diameter. When in doubt, order a 2-piece sample to test fit before committing to a larger quantity.

How strong are these carbon fiber square tubes compared to aluminum?

Carbon fiber composite is generally significantly stiffer and stronger per unit weight than aluminum profiles of comparable dimensions. Exact tensile and flexural values depend on the fiber layup and resin system used in manufacturing. For structural load calculations in critical applications, contact us to confirm specifications for your specific variant before ordering.

Can these tubes be used outdoors or in wet environments?

Carbon fiber composite is inherently corrosion-resistant and does not rust or oxidize. The black resin exterior provides a baseline moisture barrier. For prolonged outdoor UV exposure, applying a clear UV-protective topcoat is generally recommended to preserve surface appearance and prevent resin yellowing over time.

What thread or interface standards are compatible with the round inner bore?

The round inner bore is sized to accept standard metric rods, cables, or press-fit inserts. Bore diameters range from 0.8mm to 9.5mm across the available size variants. Carbon fiber does not tap threads reliably on its own — for threaded connections, use bonded metal inserts or end caps secured with structural epoxy.

Can I cut these tubes to a shorter length?

Yes. Carbon fiber tubes cut cleanly with a fine-tooth carbide or diamond-coated blade at low feed rates to minimize delamination. Always wear a dust mask rated for fine particulates and eye protection when cutting, as carbon fiber dust is an irritant. Seal cut ends with thin CA glue or epoxy to lock the fiber ends and prevent fraying.

Which size is typically used for drone frames or RC builds?

For micro and mini drone arms, the 1.4×1.4 to 3×3mm sizes are typically used. For larger 5-inch or freestyle frames, 4×4 to 6×6mm tubes are more common. Match the bore to your motor mount rod or cable pass-through diameter. For RC car chassis rails or antenna mounts, the 4×4 to 8×8mm range is generally a good starting point depending on the scale of the build.

How many pieces come in each order, and can I mix sizes?

Pack quantity is selectable at checkout: 1, 2, 3, 5, 8, or 10 pieces per order (availability varies by size). Each piece is 500mm (≈19.7") long. To mix sizes, add each size as a separate line item to your cart. Bulk pricing is reflected in the per-unit cost as quantity increases.

🛒 Select your size and pack quantity above, then add to cart — ships from our US warehouse.

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