Carbon Fiber Square Rod / CFRP Square Bar
— Six‑Face Load Bearing · Zero Twist · Modular Lightweight Spine
1. Product Positioning
Manufactured from T700/T800 unidirectional carbon fiber prepreg in a 0°/90° cross‑ply layup, then wrapped with 3K twill or plain weave fabric and co‑cured via high‑temperature compression or pultrusion, these solid or hollow square rods deliver precise square cross‑sections. Compared to round rods, square rods naturally resist torsion, simplify alignment, and streamline assembly—making them the “linear backbone” for trusses, robotic arms, sports equipment, and drone frames.
2. Manufacturing Processes
- Pultrusion: Continuous lengths up to 3 m, straightness ≤ 0.3 mm/m, ideal for high‑volume standard sizes.
- Compression Molding: Lengths up to 1 m, dimensional accuracy ± 0.05 mm, suited for precision holes and inserts.
- Secondary Machining: CNC flattening, M3–M12 tapping, stainless‑steel insert riveting, laser logo engraving.
3. Technical Specifications (10×10 mm Solid vs. 10×10 mm Hollow, 2 mm Wall)
| Property | Solid Rod | Hollow Rod |
|---|---|---|
| Density | 1.58 g/cm³ | 1.55 g/cm³ |
| Tensile Strength | 2600 MPa | 2400 MPa |
| Elastic Modulus | 160 GPa | 150 GPa |
| Flexural Rigidity (EI) | 1.33×10⁴ N·mm² | 9.7×10³ N·mm² |
| Torsional Constant (J) | 1.41×10⁴ mm⁴ | 1.08×10⁴ mm⁴ |
| Operating Temperature | −40 °C to +180 °C | −40 °C to +180 °C |
4. Common Stock Dimensions
A. Solid Square Rods
| Side Width a (mm) | Weight (g/m) | Area Moment I (cm⁴) | Typical Use |
|---|---|---|---|
| 3 | 14 | 0.011 | Model aircraft rib pins |
| 4 | 25 | 0.027 | FPV antenna mounts |
| 5 | 40 | 0.052 | Robotic linkages |
| 6 | 57 | 0.108 | Folding bike latches |
| 8 | 101 | 0.341 | Photography light booms |
| 10 | 158 | 0.833 | Drone arms |
| 12 | 227 | 1.728 | Robotic Z‑axes |
| 15 | 355 | 4.219 | Tent center poles |
| 20 | 632 | 13.33 | Racing boat masts |
| 25 | 987 | 32.55 | Industrial gantry frames |
| 30 | 1422 | 67.50 | Robot base beams |
B. Hollow Square Rods (2 mm Wall)
| Side Width a (mm) | Weight (g/m) | Area Moment I (cm⁴) | Typical Use |
|---|---|---|---|
| 10 | 110 | 0.56 | Light‑duty arms |
| 12 | 145 | 1.15 | Camera slider supports |
| 15 | 187 | 2.53 | E‑scooter frames |
| 20 | 270 | 7.25 | Off‑road roof racks |
| 25 | 355 | 15.63 | Stage lighting trusses |
| 30 | 440 | 28.13 | Robot seventh axis |
Customization: Solid up to 80×80 mm; hollow up to 100×100 mm (wall 1.5–6 mm); lengths to 4 m.
5. Machining & Assembly
- End Machining: 0.5×45° chamfers, CNC flats, M3–M12 tapping.
- Inserts:
- Stainless‑steel threaded sleeves, pull‑out ≥ 8 kN
- Aluminum quick‑release brackets (60°/90°/120°)
- Surface Finishes:
- 3K twill gloss/matte
- UD black fiber for maximum strength
- Fluorocarbon paint, glow‑in‑the‑dark markings
6. Application Examples
- Drones: X‑frame spars in 25×25×600 mm hollow rods, reducing airframe weight by 42 %.
- Robotics: 15×15×800 mm solid rods in SCARA arms, repeat positioning ± 0.02 mm.
- Photography: 10×10×1200 mm hollow rods with aluminum end caps, supporting 2 kg loads without deflection.
- Sports Equipment: 20×20×1500 mm solid poles in ski poles, tripling flexural rigidity.
- Exhibition Structures: 30×30×2000 mm hollow rods for modular stands—tool‑free assembly on site.
7. Ordering & Delivery
- MOQ: 1 piece in stock; custom runs from 50 pieces.
- Lead Times: Stock ships in 24 h; custom CNC in 3–5 days; extra‑long rods in 7–10 days.
- Packaging: Individual film wrap → foam → carton; corner protectors for lengths ≥ 1.5 m.
- Certifications: Material batch report, RoHS, REACH, UL94‑V0 (flame‑retardant option).
Offline Contracts
All sales of our carbon fiber materials are conducted through offline contract agreements to ensure each order precisely meets your specifications, compliance requirements, and agreed payment terms. Please contact our sales team to initiate the contract process and discuss project details.
| name | value | unitCode | unitText |
|---|---|---|---|
| MOQ | 50 | PCS | |
| Lead Time | 5–20 | business days | |
| Material | Carbon Fiber | ||
| Size | Customizable (diameter / length) |
Resources
Carbon fiber square rods—four sharp edges defining zero‑twist, linear power for your structural designs.
