Finding the right SCH 40 aluminum pipe depends on your project needs, whether you require light weight, corrosion resistance, or ease of fabrication. This guide highlights five practical options and who they’re best for, drawing on common spec benchmarks like inside/outside diameter, wall thickness, and length. The top picks are suited for builders, makers, and hobbyists tackling metal fabrication, framing, or structural DIY tasks. Use the summary table to compare key dimensions at a glance.
| Product | Material & Grade | Nominal Size | Outside Diameter / Inside Diameter | Length |
|---|---|---|---|---|
| Online Metals 6061 Aluminum Pipe | 6061 Aluminum, T6 Extruded | 2″ Nominal | OD 2.38″ / ID 2.067″ | 12″ |
| Online Metals 6061 Aluminum Pipe | 6061 Aluminum, T6 Extruded | 1″ Nominal | OD 1.32″ / ID 1.049″ | 72″ |
| Generic 0.840″ OD Aluminum Pipe | 6061-T6 Aluminum | 1/2″ NPS SCH 40 | OD 0.840″ / ID not listed | 47″ |
| M METERXITY 6063 Aluminum Round Tube | 6063 Aluminum | 12″ length | OD 1.57″ / ID 1.46″ | 12″ |
| Generic 0.840″ OD Aluminum Pipe | 6061-T6 Aluminum | 1/2″ NPS SCH 40 | OD 0.840″ / ID not listed | 47″ |
6061 Aluminum Pipe, Schedule 40, 2″ Nominal
Product highlights: 6061 aluminum offers a strong strength-to-weight ratio, good corrosion resistance, and excellent weldability. This 2″ nominal pipe has an inner diameter of about 2.067″ and an outer diameter of 2.38″, with a 0.15″ wall. Suitable for structural frames, light-duty hydraulic lines, and workshops needing reliable aluminum tubing. Better for projects requiring weldability and machinability.
Best for: Builders and fabricators needing a sturdy, weldable aluminum pipe for frames, supports, or light structural components. This option is a solid all-around choice where weight savings matter without sacrificing strength.
Caution: Confirm compatibility with your welding process, as some setups may require pre-welding preparation for aluminum alloys.
6061 Aluminum Pipe, Schedule 40, 1″ Nominal
Product highlights: A 6061 aluminum pipe with 1″ nominal size, 1.049″ inner diameter, 1.32″ outer diameter, 0.13″ wall, and 72″ length. Valued for its balance of machinability and corrosion resistance, it’s a common choice for DIY projects, frames, and light fabrication. Best for: Projects that require longer lengths and easier handling in shops or garages.
Caution: The longer length may require alignment and handling considerations; plan for proper support during cutting or welding.
0.840 OD (1/2 inch NPS), Sch 40, 47 inches
Product highlights: This 6061-T6 aluminum pipe features a 0.840″ outside diameter and a 0.109″ wall, with a 47″ length. It offers good weldability and is suitable for DIY metalworking, prototyping, and home projects requiring lighter aluminum tubing. Best for: Small-scale crafts or repairs where a 1/2″ NPS size is appropriate and post-fabrication shaping is anticipated.
Caution: Check if your project needs a precise inner diameter; this option lists outer diameter primarily and may require measurement verification for mating components.
0.840 Od 1/2 Inch NPS, Sch 40, 47 Inches
Product highlights: 6061-T6 aluminum pipe with 0.840″ outer diameter and 47″ length. Suited for weldable metal projects, repairs, and prototyping. Best for: DIY builders who need a versatile, weldable aluminum pipe for model builds or frame extensions.
Caution: If your project requires precise inner diameter compatibility, verify available tolerances and mating parts before ordering.
Des Moines Steel Galvanized SCH 40 Pipe A53: 1-1/2″
Product highlights: This galvanized steel SCH 40 pipe is 1-1/2″ ID x 48″ long, weighing around 54 pounds for 20-foot lengths. While it is steel rather than aluminum, it is included for buyers comparing material options that may impact strength, corrosion resistance, and weight. Best for: Projects needing higher strength and ductility, or when aluminum options are insufficient for environmental exposure. Caution: It is not aluminum; if aluminum is required for weight or corrosion reasons, choose alternatives above.
Buying Guide
What matters most when choosing SCH 40 aluminum pipe?
Key considerations include alloy type (6061 vs 6063), wall thickness, diameter, and length. 6061 alloys typically offer good strength, weldability, and corrosion resistance for structural uses, while 6063 may provide better formability and surface finish for decorative or architectural frames.
When to choose larger vs smaller diameters?
Smaller diameters are easier to bend, cut, and handle for DIY projects and prototypes. Larger diameters provide greater bending rigidity and load-bearing capacity for frames and supports, but require heavier tubing and more powerful fabrication tools.
Welding and fabrication considerations
Aluminum welding requires proper techniques and equipment. Ensure compatibility with your welding method (MIG/TIG), and consider pre-weld cleaning and oxide removal. Long, slender tubes may require fixture work to maintain alignment during welding.
Length planning and storage
Longer tubes reduce waste from cuts but demand more storage space and handling. Plan cutting sequences and supports to prevent warping or kinking during processing.
Material comparison at a glance
- 6061-T6: Strong, weldable, corrosion-resistant; good for structural components and frames.
- 6063: Fine for lighter structural work and smoother finishes; generally easier to form.
- Radius and tolerance: Aluminum tubing typically ships with standard tolerances; verify inner diameter if precise mating is needed.
- Aluminum vs galvanized steel: Aluminum is lighter and corrosion-resistant; steel offers higher raw strength and rigidity at greater weight and potential corrosion without coatings.
Which product should you buy?
Choose based on your project needs: get 6061 tubes for structural, weldable frames and durably light builds; select 6063 for easier fabrication and a smoother finish on decorative projects; consider shorter lengths for easier handling in workshops. If you require galvanized steel for environmental exposure or higher strength in a metal frame, compare to steel SCH 40 options but note material differences.
FAQ
- Q: What is SCH 40 aluminum pipe?
- A: SCH 40 typically refers to pipe wall thickness; aluminum pipes with SCH 40 markings denote similar wall thickness used in plumbing and structural contexts, though many SCH 40 references are more common with steel. Always verify exact dimensions with the supplier.
- Q: Are these pipes weldable?
- A: Yes, 6061 aluminum pipes are generally weldable with proper technique and equipment. Ensure the joint is clean and protected from oxidation.
- Q: Which aluminum alloy is best for outdoor use?
- A: 6061 and 6063 alloys offer good corrosion resistance; 6061 tends to be stronger, while 6063 can be easier to form and finish for outdoor installations.
- Q: How do I choose the right diameter?
- A: Pick a diameter that matches your fittings and the required load or bending stiffness. If in doubt, larger diameters provide more rigidity for similar wall thickness.
- Q: Do these come with finishes or coatings?
- A: Most listings focus on the pipe material and dimensions. Finishes are variable; verify coating options with the supplier for outdoor or aesthetic applications.
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