{"id":4555,"date":"2026-06-01T11:18:27","date_gmt":"2026-06-01T03:18:27","guid":{"rendered":"https:\/\/ytcarbonfiber.com\/?post_type=product&p=4555"},"modified":"2026-06-08T21:12:57","modified_gmt":"2026-06-08T13:12:57","slug":"carbon-fiber-square-tube","status":"publish","type":"product","link":"https:\/\/ytcarbonfiber.com\/de\/produkt\/carbon-fiber-square-tube\/","title":{"rendered":"Carbon Fiber Square Tube"},"content":{"rendered":"

Product Details<\/h2>\n

If you’re building a frame \u2014 machine guard, gantry, robot chassis, equipment rack \u2014 a carbon fiber square tube is the profile that makes assembly simple. The four flat surfaces mean standard L-brackets, T-plates, corner gussets, and bolted flanges all seat flush without custom machining. Try that with a round tube and you’re cutting saddle blocks or bonding adapters. For bolted structures where speed of assembly and rigidity of the joint matter more than torsional uniformity, square is the practical choice.<\/p>\n

A square cross-section gives you equal bending stiffness in both the X and Y axes \u2014 unlike a rectangular tube which sacrifices one axis to maximize the other. That symmetry matters when your frame carries loads from multiple directions and you can’t predict which axis takes the bigger hit. The trade-off vs a round profile is torsion: corners create stress concentration under twist, so a square tube isn’t the right pick for rotating shafts or torque-transmitting members. For those, see our carbon fiber round tube<\/a><\/strong>. But for static and semi-static frames, square delivers simpler joinery and adequate stiffness at a lower hardware cost.<\/p>\n

We manufacture these carbon fiber square tubes in our Shenzhen factory using both roll-wrapped and pultruded processes. Pultruded square tubes are available in single-piece lengths up to 8 meters \u2014 one of the longest capabilities among Chinese carbon fiber tube manufacturers. Corner radii are controlled at 1\u20133mm depending on wall thickness, keeping fiber continuity around the bend while reducing the stress risers that sharp 90\u00b0 corners create. Every tube ships with dimensional inspection data covering side length, wall thickness, and straightness.<\/p>\n

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Specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Specification<\/th>\nDetails<\/th>\n<\/tr>\n<\/thead>\n
Material<\/strong><\/td>\nT300\/T700\/T800 carbon fiber<\/td>\n<\/tr>\n
Cross-Section<\/strong><\/td>\nSquare (equal sides)<\/td>\n<\/tr>\n
Side Length (OD)<\/strong><\/td>\n5mm \u2013 120mm<\/td>\n<\/tr>\n
Wall Thickness<\/strong><\/td>\n0.5mm \u2013 8mm<\/td>\n<\/tr>\n
Corner Radius<\/strong><\/td>\n1\u20133mm (wall thickness dependent)<\/td>\n<\/tr>\n
Max Single-Piece Length<\/strong><\/td>\n8000mm (8 meters)<\/td>\n<\/tr>\n
Construction<\/strong><\/td>\nRoll-wrapped \/ Pultruded<\/td>\n<\/tr>\n
Weave Options<\/strong><\/td>\n3K Twill \/ Plain \/ UD<\/td>\n<\/tr>\n
Surface Finish<\/strong><\/td>\nMatte \/ Glossy<\/td>\n<\/tr>\n
Fiber Volume Fraction<\/strong><\/td>\n60\u201365%<\/td>\n<\/tr>\n
Density<\/strong><\/td>\n1.55\u20131.60 g\/cm\u00b3<\/td>\n<\/tr>\n
Tensile Strength (axial)<\/strong><\/td>\n\u2265 800 MPa<\/td>\n<\/tr>\n
Flexural Modulus<\/strong><\/td>\n\u2265 120 GPa (0\u00b0 layup)<\/td>\n<\/tr>\n
Straightness Tolerance<\/strong><\/td>\n\u2264 1mm per meter<\/td>\n<\/tr>\n
Operating Temperature<\/strong><\/td>\n-40\u00b0C to 120\u00b0C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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Applications<\/h2>\n
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