Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD
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Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm ODCarbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD

Carbon Fiber Square Tube with Round Hole — 200mm Hollow Pole, 1.7mm to 5mm OD

HomeDIYer
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By HomeDIYer®

Price:
$4.08 USD
Stock:
In stock (500 units), ready to be shipped

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Description

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

Builders working on RC aircraft frames, drone arms, robotic linkages, and precision instrumentation rigs know the frustration of sourcing structural tubing that is both rigid and light enough to matter. Metal square tubes add unnecessary weight; plastic profiles lack the stiffness needed for tight tolerances. These carbon fiber square tubes with a centered round bore solve both problems in a single profile.

Each tube measures 200mm (≈7.87") in length and is available in five cross-section options: 1.7×1.7mm ID 1mm, 2×2mm ID 1mm, 3×3mm ID 2mm, 4×4mm ID 3mm, and 5×5mm ID 4mm. The square outer profile provides flat bearing surfaces for brackets and clamps, while the centered round inner bore accommodates metric push-rods, control wires, or carbon fiber round rods of the matching diameter. Packs are available from 1 to 50 pieces to suit prototyping through small-batch production.

Typical applications include FPV drone frame spars, RC airplane fuselage stringers, robotic arm linkage tubes, lightweight antenna mast sections, and precision measurement instrument frames where a low-weight carbon fiber hollow square tube is required.

🔵 Compatibility Note: The round inner bore (ID 1mm–4mm) accepts standard metric round rods and wires of the matching diameter. The square outer profile fits standard square-channel clamps and brackets. Confirm your mating component dimensions against the selected variant before ordering.

✅ Key Features of These Carbon Fiber Square Hollow Tubes

  • ⚖️Low Weight, High Rigidity — Carbon fiber composite delivers a stiffness-to-weight ratio that aluminum square tubing cannot match, making it ideal for weight-sensitive RC and robotic builds.
  • 🔲Square Outer Profile with Flat Bearing Surfaces — The square cross-section seats flush against brackets, clamps, and channel mounts without rotation, simplifying alignment in multi-axis carbon fiber frame assemblies.
  • ⭕Centered Round Inner Bore — The concentric round hole allows metric push-rods, control wires, or round carbon rods to pass cleanly through the tube, a feature not found on standard solid square carbon fiber rods.
  • 📏Five Cross-Section Sizes in One Listing — From the compact 1.7×1.7mm ID 1mm up to the 5×5mm ID 4mm, you can source the exact hollow carbon fiber square tube size your design calls for without ordering from multiple suppliers.
  • 🛡️Corrosion-Resistant Composite Construction — Unlike steel or aluminum tubing, carbon fiber epoxy composite does not rust or oxidize, making these tubes suitable for outdoor RC builds and humid workshop environments.
  • ✂️Machinable to Length — At 200mm (≈7.87") each, tubes can be cut to shorter lengths with a fine-tooth saw or rotary tool, giving you flexibility to adapt a single stock length to multiple project requirements.

📐 Technical Specifications — Carbon Fiber Square Hollow Tube

Material Carbon fiber reinforced epoxy composite
Profile Shape Square outer / Round inner bore
Available Cross-Sections 1.7×1.7mm ID 1mm · 2×2mm ID 1mm · 3×3mm ID 2mm · 4×4mm ID 3mm · 5×5mm ID 4mm
Length 200mm (≈7.87")
Wall Thickness (approx.) See variant options — typically 0.35mm–0.5mm per side
Finish Matte black carbon fiber surface
Packing Quantity Options 1 / 2 / 3 / 5 / 10 / 20 / 30 / 50 pcs
Tensile / Flexural Strength Contact us to confirm — varies by fiber layup
Compatible Inner Rod Diameter Matches ID of selected variant (1mm, 2mm, 3mm, or 4mm)
Country of Origin See variant options
⚠️ Sizing Tip: The "Width x Thick" dimension is the outer square profile; the "ID" is the inner round bore diameter. Always verify both dimensions against your design before ordering. If you need a custom length or wall thickness, contact us before purchase.

❓ Frequently Asked Questions

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

Measure the slot or channel your tube needs to fit into, then select the outer dimension (Width × Thick) that matches. The inner diameter (ID) tells you the bore size for any rod or wire passing through. For example, the 3×3mm ID 2mm variant has a 3mm square outer profile with a 2mm round bore — equivalent to roughly 0.12" OD and 0.08" bore. When in doubt, size up; it's easier to shim a slightly larger tube than to force a too-small one.

How strong are these carbon fiber square tubes?

Carbon fiber composite tubes are generally significantly stiffer and stronger per unit weight than aluminum or steel tubes of the same cross-section. Exact tensile and flexural values depend on fiber orientation and resin system. For load-critical applications, contact us to confirm specifications before ordering.

Can these tubes be used outdoors or in humid environments?

Carbon fiber composite is inherently corrosion-resistant and performs well in most outdoor and humid conditions. The epoxy resin matrix typically provides adequate moisture resistance for general use. For prolonged UV or saltwater exposure, sealing the cut ends with epoxy or CA glue is recommended to prevent moisture wicking into the fiber layers.

What rod or wire diameter fits inside the inner bore?

The inner bore is a round hole sized to the ID listed in the variant name. A 1mm ID bore accepts 1mm metric round rods or wires; a 4mm ID bore accepts 4mm rods. In most cases a snug slip-fit is achievable with a rod of the matching nominal diameter. For a press-fit, use a rod 0.05–0.1mm oversized and test on a sample piece first.

Can I cut these tubes to a shorter length?

Yes. Carbon fiber tubes can generally be cut with a fine-tooth saw, rotary cutoff wheel, or diamond-coated cutting disc. Always wear a dust mask (N95 or better) and eye protection when cutting carbon fiber, as the fine particles are a respiratory irritant. Lightly sand or seal cut ends with thin CA glue to prevent edge fraying.

How do I select the right quantity for my build?

We offer packs of 1, 2, 3, 5, 10, 20, 30, and 50 pieces. For prototyping or single-axis builds, 1–3 pcs is typically sufficient. For multi-axis frames, antenna arrays, or small production runs, ordering 10–50 pcs provides better per-unit value and keeps spares on hand for rework or replacements.

What is the approximate wall thickness of each size?

Wall thickness is calculated from the outer dimension minus the inner bore, divided by two. For example, the 1.7×1.7mm ID 1mm variant has a wall of approximately 0.35mm (≈0.014") per side, while the 5×5mm ID 4mm variant has a wall of approximately 0.5mm (≈0.020") per side. For exact values, see variant options or contact us to confirm.

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

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