What is an Aluminum Tube?
Aluminum tubes are hollow extruded profiles widely used in manufacturing. They are created by pushing hot aluminum billets through a steel die to form a continuous hollow shape. Because of aluminum's natural properties, these tubes offer an excellent strength-to-weight ratio, good thermal conductivity, and high resistance to rust.
They are heavily used in:
- Electronics and automation components
- Automotive manufacturing and vehicle tracking systems
- Industrial automation and robotic machinery
Among all alloys, 6061 and 6063 are the most commonly used for precision tube applications. They offer the best balance of workability, commercial availability, and cost.
6061 vs 6063 Aluminum Tube
Both 6061 and 6063 belong to the 6000-series aluminum family, meaning magnesium and silicon are their main alloying elements. However, their internal formulas differ, leading to different mechanical behaviors. Both are commonly supplied in the "T6" temper, meaning they are solution heat-treated and artificially aged for maximum hardness.
Chemical Composition Comparison (wt%)
| Element | 6061-T6 Alloy | 6063-T6 Alloy | Impact on Performance |
| Aluminum (Al) | Balance | Balance | Base material. |
| Magnesium (Mg) | 0.8% - 1.2% | 0.45% - 0.9% | Adds strength. 6061 has more. |
| Silicon (Si) | 0.4% - 0.8% | 0.2% - 0.6% | Improves heat treatability. |
| Copper (Cu) | 0.15% - 0.4% | Max 0.1% | 6061 has more copper, making it stronger but slightly less corrosion-resistant than 6063. |
| Iron (Fe) | Max 0.7% | Max 0.35% | Controls grain structure. |
Mechanical Properties Comparison
| Property | 6061-T6 | 6063-T6 |
| Tensile Strength (Yield) | ≥ 275 MPa | ≥ 170 MPa |
| Ultimate Tensile Strength | ≥ 310 MPa | ≥ 215 MPa |
| Elongation | ≥ 10% | ≥ 12% |
| Machinability | Good | Excellent |
| Surface Finish (Extruded) | Normal | Extremely Smooth |
| Anodizing Response | Good (May look matte) | Excellent (Bright, uniform color) |
6061 focuses on strength, while 6063 is optimized for surface quality and anodizing. If you are building a heavy-duty structural frame, use 6061. If you are building a precision electronic housing that needs a beautiful, protective surface finish, 6063 is usually the better choice.
Send your working environment details (temperature, mechanical stress, chemical exposure) to GNEE. Our engineering team will recommend the most cost-effective alloy within 24 hours.
Aluminum tubes are widely used as sensor probe housings and connector protection tubes in industrial and automotive applications.
Here are the core functions they provide:
1. Protection of Internal Components
Sensors and connectors contain delicate PCBs, microchips, and fine wiring.
Anti-Impact: The aluminum shell absorbs mechanical shocks from factory equipment or rough roads, protecting the glass or ceramic components inside.
Anti-Corrosion: When sealed properly, the tube protects the internal electronics from water, dust, engine oil, and industrial chemicals.
2. Providing a Stable Structure
Position Stability: For devices like float liquid level sensors, the tube acts as a rigid guide rod. It must remain perfectly straight so the magnetic float can slide up and down without getting stuck.
Signal Accuracy: Because aluminum provides stable thermal conductivity, temperature sensors can detect heat changes rapidly and accurately through the metal wall.
3. Adapting to Precision Assembly
Internal Diameter (ID) Control: The inner cavity of the tube can be extruded and machined to exact dimensions so that internal O-rings and circuit boards fit snugly.
Smooth Inner Wall: A clean, smooth internal surface prevents the tearing of wire insulation when cables are pulled through the connector housing.
Key Selection Factors
Factor 1: Dimensions and Tolerances
Standard architectural aluminum tubes are not suitable for electronics. You need precision dimensions.
Tight tolerance is critical for sensor accuracy and assembly efficiency. Ask your supplier if they can guarantee tight ID/OD tolerances specifically for sensor housings.
Contact GNEE today. We specialize in precision extruded tubes with strictly controlled wall thickness and ID dimensions. Get a quote for your exact size.
Factor 2: Surface Treatment
Raw aluminum will oxidize naturally, but this natural layer is thin and weak. For industrial sensors, you must apply a professional anodic coating.
Core Functions of Anodizing:
Anti-Corrosion: Blocks moisture and salt from reaching the raw metal.
Electrical Insulation: The anodized aluminum oxide layer is non-conductive. This prevents short circuits if an internal bare wire accidentally touches the inner wall of the tube.
Aesthetics: Allows the tube to be dyed black, silver, or blue, providing a premium look for your electronic products.
Factor 3: Material Selection Rules
6063-T6 → Recommended for sensor housings and connector covers. It provides a smoother finish, better ID control, and flawless anodizing.
6061-T6 → Optional for structural parts. Use this only if the housing also acts as a heavy load-bearing bracket.
Typical Industry application of 6061 t6 and 6063 t6 Aluminum Tube
To build trust and verify this engineering data, let's look at how leading factories currently order their materials. Here are the typical choices made by top electronics manufacturers.
| Application Type | Recommended Alloy | Primary Reason for Choice |
| Liquid Level Sensor Tube | 6063-T6 | Excellent surface finish allows floats to slide smoothly; great anodizing. |
| Electronic Connector Housing | 6063-T6 | Precision fit for O-rings; perfect for weather-proofing. |
| Automotive Structural Bracket | 6061-T6 | High yield strength to survive engine vibration and road impact. |
| Temperature Probe Shell | 6063-T6 | Good thermal conductivity and easy to machine the closed end. |
Most OEM sensor manufacturers prefer 6063-T6 aluminum tubes for better anodizing consistency and precision performance. By standardizing on 6063-T6, factories can reduce their defect rates during the final chemical coating process.
Why Choose GNEE?
- Multi-Size Support: We understand OEM needs. We accept multi-size orders in one shipment. You can order OD 12mm, OD 16mm, and OD 20mm tubes all in the same container, with flexible Minimum Order Quantities (MOQ).
- Complete Data Support: We provide full chemical composition and mechanical property data sheets (MTC) with every delivery. This ensures your products pass international ISO and CE certifications.
- Precision Machining Capability: We do not just extrude; we control. We guarantee tight tolerance control and a smooth inner surface, ensuring your PCB boards and O-rings fit perfectly every time.
- Professional Surface Treatment: Our in-house anodizing lines provide stable anodizing thickness (20–25 μm) that complies with harsh environmental testing standards.
GNEE supports OEM customers with mixed-size aluminum tube orders, reducing sourcing complexity and improving supply efficiency.
