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.

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.

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.

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.

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.

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.

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.