What Is an Aluminum Round Tube?
An aluminum round tube is a hollow cylindrical product, typically made by extrusion, cold drawing, or forging. Known for its exceptional strength-to-weight ratio, corrosion resistance, and formability, it serves applications across industries such as aerospace, construction, automotive, marine, electronics, and industrial manufacturing. Common alloy series include 1xxx, 3xxx, 5xxx, 6xxx, and 7xxx.
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Common Aluminum Alloys for Round Tubes
| Alloy | Description | Applications |
|---|---|---|
| 6061-T6 | High strength, good corrosion resistance, excellent weldability | Structural, automotive, aerospace, marine |
| 6063-T5/T52 | Excellent surface finish, good for anodizing | Architectural trim, furniture, piping |
| 7075-T6 | Very high strength, lower corrosion resistance | Aerospace, military-grade frames |
| 2024-T3 | High fatigue resistance | Aircraft, vehicle suspension |
| 3003-H14 | Great corrosion resistance, moderate strength | HVAC, decorative applications |
Sizes and Dimensions
Aluminum round tubes are available in a wide range of outer diameters, wall thicknesses, and lengths. Below is a sample table of standard sizes:
| Outer Diameter (OD) | Wall Thickness | Length (Standard) | Tolerance |
|---|---|---|---|
| 1/4" (6.35 mm) | 0.035" (0.89 mm) | 6m / Custom | ±0.1 mm |
| 1/2" (12.7 mm) | 0.065" (1.65 mm) | 6m / Custom | ±0.1 mm |
| 1" (25.4 mm) | 0.083" (2.11 mm) | 6m / Custom | ±0.15 mm |
| 2" (50.8 mm) | 0.120" (3.05 mm) | 6m / Custom | ±0.2 mm |
| 4" (101.6 mm) | 0.250" (6.35 mm) | 6m / Custom | ±0.2 mm |
Custom wall thicknesses and lengths available upon request.
Features and Advantages
Lightweight: Aluminum has a low density (approx. 2.7 g/cm³), making it much lighter than steel or copper.
Corrosion Resistance: Naturally forms a protective oxide layer, ideal for outdoor or marine environments.
Good Strength: Alloys like 6061 and 7075 provide impressive mechanical strength.
Excellent Weldability: Most aluminum tubes can be TIG or MIG welded.
Aesthetic Finish: Smooth surface ideal for polishing, anodizing, or painting.
Machinability: Easy to cut, drill, bend, and machine for custom designs.
Thermal Conductivity: Efficient heat transfer makes it suitable for radiators and cooling systems.
Recyclability: 100% recyclable without loss of performance.
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Dimensions, Tolerances & Weights
▶ Outer Diameter & Thickness Range
Diameter: From approx. 5 mm to 630 mm (0.2″ to 24")
Wall Thickness: From 0.8 mm to 40 mm (or custom thicker)
Length & Finishing Options
Standard lengths: 0.5 m–10 m or higher, custom lengths available
Surface finishes: Mill, Polished, Anodized, Powder-coated, Brushed, etc.
▶ Dimensional Table (Sample)
| OD (mm/in) | Wall Thickness (mm/in) | Typical Alloy | Approx. Weight ft (lbs) |
|---|---|---|---|
| 12.7 mm (½") | 1.6 mm (0.062") | 6063‑T5 | 0.07 |
| 20 mm (0.787") | 2.0 mm (0.079") | 6061‑T6 | 0.12 |
| 25.4 mm (1") | 2.5 mm (0.098") | 6061‑T6 | 0.18 |
Product Packaging
Adopting a professional industrial packaging solution that is moisture-proof and scratch resistant, each batch of steel is tied and fixed with customized wooden frames/steel strips, combined with anti rust coatings and cushioning pads to ensure zero damage during transportation. Clear product model, batch number, and storage identification on the outer packaging, supporting customized enterprise logos and information labels. Environmentally friendly and recyclable packaging materials practice green concepts, reducing transportation and disassembly costs.
Surface Finishes
Aluminum round tubes can be supplied with different surface treatments:
Mill Finish – Unfinished, as-extruded surface
Anodized – Electrochemically treated for enhanced corrosion resistance and appearance
Powder Coated – Durable, colorful coating for outdoor use
Polished – Mirror-like finish for decorative use
Brushed/Satin Finish – Subtle sheen, hides fingerprints
Manufacturing Process
Extrusion: Molten aluminum is forced through a circular die to form a continuous tube.
Cooling and Cutting: The extruded tube is cooled and cut into desired lengths.
Heat Treatment: For heat-treatable alloys like 6061 and 7075.
Straightening & Finishing: Ensures precise dimensions and surface smoothness.
Technical Specification Summary
| Specification | Details |
|---|---|
| Product Name | Aluminum Round Tube |
| Common Alloys | 3003, 5052, 5154, 6061, 6063, 6082, 7075 |
| Temper Options | O, H14, H112, T5, T6, T651 |
| OD Range | ~5 mm to 630 mm (0.2"–24") |
| Wall Thickness | 0.8 mm to 40 mm (custom available) |
| Length | Typical: 0.5–10 m (custom lengths available) |
| Surface Finishes | Mill, polished, anodized, powderlabeled, brushed |
| Standards | ASTM B221, B210, EN 755-2, ISO 6361, JIS H4000, GB/T 5237 |
| Certifications | ISO 9001, MTC, third-party inspections |
| Material Properties | Tensile: ~140–330 MPa (alloy-dependent); Elongation: ~10–15% |
| Density | ~2.71 g/cm³ |
| Typical Weight | ~0.07–0.22 lbs/ft for standard small sizes |
| MOQ | Typically 1 ton or smaller sample orders |
| Packaging | Bundled, plastic-wrapped, end-capped, wooden/steel pallet |
Principal Applications Across Industries
Construction & Architecture
Railings, support posts, curtain wall framing, fence posts, and trim—especially with 6063 alloy for anodized finishes.
Aerospace & Automotive
Used in lightweight structural frames, fuel lines, hydraulic tubes, exoskeletons, roll cages. Particularly alloy 2024 and 7075 for fatigue-critical roles.
Marine & Outdoor Equipment
Ideal for boat masts, marine railings, ladders, and outdoor frameworks due to corrosion resistance.
HVAC, Electrical & Heat Exchangers
Used in ducting, radiator frames, heat sinks, LED housings—thanks to thermal and electrical conductivity.
Furniture, Sports & DIY Projects
Lightweight bicycle frames, table legs, modular structures; readily machined or welded for custom designs.
Medical & Specialty Components
Ultra-precise drawn tubes for instrumentation, hydraulics in aircraft, and food packaging machinery.
Round vs. Square Tube: Design Considerations
Round tubes distribute stress uniformly under torsion, making them ideal for piping, railings, and aerodynamic applications.
Square tubes offer higher bending stiffness per unit area, better suited for rigid structural frames.
Round sections are lighter, easier to roll-form, and enable smoother fluid flow.
Frequently Asked Questions (FAQs)
Q1: What’s the difference between 6061 and 6063 aluminum tube?
A1: 6061 has higher strength and is better for structural use, while 6063 has a better surface finish and is ideal for anodizing and decorative applications.
Q2: Can aluminum round tubes be welded?
A2: Yes, most grades like 6061 and 6063 are weldable using TIG or MIG methods.
Q3: Is aluminum tube suitable for outdoor use?
A3: Yes, especially when anodized or powder coated. It resists corrosion very well in most environments.
Q4: Can I get custom lengths or machining services?
A4: Absolutely. We offer cut-to-length service, hole drilling, bending, and more.
Q5: Do you provide small quantity orders?
A5: Yes. We support both large industrial projects and small custom orders.
Why Global Clients Choose Us?
Henan Gengfei Industrial Co., Ltd. is China’s leading supplier of steel and other metal products. Our company is dedicated to providing its customers with the quick quotes, superior quality products, competitive prices and fastest possible deliveries.
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