Solid Carbon Fiber Rod / CFRP Solid Round Bar
— Omnidirectional Fiber Winding · Ultimate Compressive Strength · Core‑Free Pure Carbon
1. Product Definition
Our solid carbon fiber rods are manufactured by wet filament winding or pultrusion‑hot‑pressing of continuous T700/T800 carbon fiber tows, producing a fully dense, filler‑free circular bar. Multi‑angle fiber orientations (0°/±45°/90°) yield uniform strength in radial, axial, and hoop directions—offering an integrated solution for compression, bending, and torsion. Unlike square rods, these solid round bars provide isotropic mechanical performance without stress‑concentrating corners, ideal for high‑load rotational or impact applications.
2. Process Highlights
- Omnidirectional Winding: 0° primary fibers + ±45° shear layers + 90° hoop fibers boost interlaminar shear strength by 25%.
- Zero Porosity: Autoclave cure at 1.2 MPa and 150 °C achieves < 0.5% voids and surface roughness Ra ≤ 0.4 μm.
- Core‑Free Pure Carbon: No glass or fillers, density 1.58 g/cm³, strength‑to‑weight ratio surpasses titanium alloys.
- Precision Finishing: Centerless grinding and polishing to h7 diameter tolerance; optional laser‑engraved scales or logos.
3. Mechanical Properties (Ø 12 mm Example)
| Property | Measured Value |
|---|---|
| Density | 1.58 g/cm³ |
| Tensile Strength | 2800–3200 MPa |
| Compressive Strength | 900 MPa |
| E‑Modulus | 160 GPa |
| Bending Modulus | 150 GPa |
| Torsional Shear Strength | 120 MPa |
| Operating Temperature | −40 °C to +200 °C |
4. Common Stock Sizes (Solid, Core‑Free)
| Diameter (mm) | Weight (g/m) | Cross‑Section (mm²) | Polar Inertia J (cm⁴) | Typical Uses |
|---|---|---|---|---|
| 3 | 11.2 | 7.07 | 0.004 | Precision probes, headphone pivots |
| 4 | 19.9 | 12.57 | 0.013 | Watch stems, model hinge pins |
| 5 | 31.1 | 19.63 | 0.031 | Camera gimbal lock shafts |
| 6 | 44.8 | 28.27 | 0.064 | Robot joint pins |
| 8 | 79.6 | 50.27 | 0.201 | Bicycle seat stays, ski pole cores |
| 10 | 124 | 78.54 | 0.491 | Automotive shift paddle shafts |
| 12 | 179 | 113.1 | 1.018 | Marine winch pins, drone landing gear |
| 15 | 279 | 176.7 | 2.485 | Industrial lead screws |
| 20 | 496 | 314.2 | 7.854 | Rescue poles, climbing carabiner pins |
| 25 | 775 | 490.9 | 19.63 | Rowing oar shafts, sports equipment rods |
| 30 | 1116 | 706.9 | 39.76 | Heavy‑lift drone spars |
| 40 | 1982 | 1256.6 | 125.7 | Impact‑resistant bumpers |
| 50 | 3097 | 1963.5 | 306.8 | Wind‑turbine blade root bearings |
Customizable: Ø 3–80 mm; lengths up to 4 m; stepped diameters available.
5. Surface Finishes
- Standard: High‑gloss black polish (centerless grind)
- Matte: Fine bead‑blast + black epoxy seal
- Functional Coatings:
- 5 μm nickel plating for corrosion resistance & conductivity
- Laser‑etched scales at 0.1 mm accuracy
- Knurled ends, tapped M3–M20, hex socket bore
6. Assembly & Fixing
- Press‑Fit Bearings: h7 tolerance with 0.02 mm interference—no adhesive needed
- Adhesive Bonding: Epoxy structural adhesive + heat‑shrink sleeve—30 MPa pull strength
- Mechanical Locking: Radial pins, snap‑ring grooves, D‑cut flats
7. Application Examples
- Medical: Ø 6 mm × 300 mm rods as disposable orthopedic drill guides—¼ the weight of stainless steel, reducing surgeon fatigue.
- Robotics: Ø 15 mm × 800 mm rods as SCARA end‑effectors—twist < 0.1° @ 50 N·m.
- Automotive: Ø 25 mm × 1200 mm rods as racing anti‑roll bars—65% lighter than steel with higher stiffness.
- Sports: Ø 12 mm × 1500 mm rods for slalom ski poles—impact resistance ≥ 120 J.
- Wind Power: Ø 50 mm × 2000 mm rods as blade bearing sleeves—2000 h salt‑spray durability.
8. Ordering & Delivery
- MOQ: 1 piece in stock; custom runs from 50 pcs.
- Lead Times: Stock ships in 24 h; grinding/tapping in 3–5 days; extra‑long rods in 7–10 days.
- Packaging: Individual film wrap → foam padding → carton; ≥ 1.5 m rods on wooden pallets.
- Certifications: Material batch report, RoHS, REACH, DNV‑GL marine grading.
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
Solid carbon fiber rods integrate the strength of steel, the weight savings of aluminum, and the corrosion resistance of titanium into a pure‑carbon solid shaft.
