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6063 Aluminum Square Tube - 3 Inch X 0.25
Image 6063 Aluminum Square Tube - 0.25 X 3"

6063 Aluminum Square Tube - 3 Inch X 0.25

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ALTS3X.250
3" x 3" 6063-T5 Aluminum Square Tube with a 0.250" wall thickness, sold in 144" lengths. Conforming to ASTM B221, this architectural aluminum provides 27,000 PSI tensile strength, excellent corrosion resistance, and a smooth surface ideal for anodizing. Its medium size is perfect for architectural applications like window and door frames, retail fixtures, and modern furniture construction. In stock for Los Angeles pickup.
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6063 Aluminum Square Tube - 3 Inch X 0.25

This 3" x 3" 6063-T5 Aluminum Square Tube, with a 0.250" wall, is an architectural alloy specified to ASTM B221. It combines moderate strength with a superior surface finish and excellent corrosion resistance, making it ideal for anodizing and decorative applications. In stock Los Angeles.

  • 6063-T5 Aluminum Construction
  • ASTM B221 Certified
  • 27,000 PSI Tensile Strength
  • Excellent Corrosion Resistance
Overview | Specifications | Applications | Finish Options | How to Measure | Order Checklist

6063 Aluminum is an alloy containing magnesium and silicon, commonly known as "architectural aluminum." It is produced via extrusion and is most often supplied in the T5 temper. This grade is specified under ASTM B221 and is renowned for its exceptional surface finish, high resistance to corrosion, and excellent response to anodizing, which allows for durable and decorative finishes.

As a medium 3-inch square profile, this tube provides a balance of structural utility and aesthetic appeal. It is ideal for light-duty frames, architectural trim, handrails, retail display fixtures, and custom furniture construction where clean lines and a high-quality finish are primary requirements. The hollow profile offers a good strength-to-weight ratio for these applications.

Specifications

  • Material: 6063-T5 Aluminum
  • Standards: ASTM B221
  • Strength/Tensile: 27,000 PSI
  • Dimensions: 3" x 3" x 0.250" Wall x 144" Length
  • Finish: T5 Temper (Mill Finish)
  • Certifications: MTR Available

Applications

  • Architectural & Construction: Window frames, door frames, storefronts - excellent finish and weather resistance.
  • Fixtures & Displays: Retail shelving, product stands, trade show booths - lightweight and easy to fabricate.
  • Fencing & Enclosures: Posts and rails for modern fences and gates - corrosion-resistant and visually appealing.
  • Furniture: Legs, frames, and supports for contemporary indoor and outdoor furniture.

Target Users

Architects, fabricators, furniture designers, and sign makers rely on 6063 aluminum square tube for its excellent finish, workability, and corrosion resistance in projects throughout the Los Angeles area.

Finish Options

This product comes standard with a mill finish, characterized by a smooth, semi-matte surface straight from the extrusion process. 6063 aluminum is an excellent substrate for finishing; it is highly suitable for anodizing to create a durable, protective layer, or it can be powder-coated or painted for a wide range of colors. Contact our Los Angeles sales team for custom finish inquiries.

How to Measure

Square tube is measured by its outer dimensions (Width x Height) and its wall thickness. Use calipers for an accurate measurement of the wall.

Example: To order this square tube, specify "6063 Aluminum Square Tube, 3" x 3" x 0.250" wall".

Order Checklist

  • Product name and required dimensions (3" x 3" x 0.250")
  • Material specification and quantity
  • Confirm grade (6063-T5) meets requirements
  • Surface finish requirements (Mill Finish)
  • Certifications required (Mill Test Report)
  • Special handling or delivery requirements

Quick Facts

Product
6063 Aluminum Square Tube - 3 Inch X 0.25
Material
6063-T5 Aluminum
Standards
ASTM B221
Key Properties
27,000 PSI tensile, excellent corrosion resistance, superior surface finish
Primary Applications
Architectural trim, display fixtures, furniture frames
Location
Los Angeles warehouse - Same-day pickup available
Request a Quote Ask an Expert

Available Sizes

We stock 6063 Aluminum Square Tube in sizes from 1/2" to 6" with various wall thicknesses. This 3" x 0.250" wall size is available for immediate pickup in Los Angeles.

Custom cutting services available.

Contact for Sizing
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