Where to Buy T-Slot Aluminum Extrusions (and When to Use Them)

T-slot aluminum extrusions are one of the most versatile building materials used in manufacturing, automation, DIY projects, and custom enclosures. If you’ve ever built a CNC machine, a 3D printer frame, or a custom workbench, you’ve likely come across terms like 2020 aluminum extrusion or 4040 aluminum extrusion.

But what do those numbers mean? And where’s the best place to buy them — including custom extruded profiles when you need something unique? Let’s break it down.

What Are T-Slot Aluminum Extrusions?

T-slot aluminum extrusions are modular, extruded aluminum profiles with slots that allow you to attach brackets, fasteners, and accessories without welding. They’re strong, lightweight, and easy to assemble — perfect for creating frames, guards, and enclosures.

Understanding the Nomenclature

The number system (e.g., 2020, 4040, 8020) describes the cross-sectional size of the extrusion:

• 2020 Aluminum Extrusion: 20mm x 20mm square profile (most common in hobby builds)
• 3030 or 3060: 30mm x 30mm or 30mm x 60mm profile for stronger, mid-sized frames
• 4040 Aluminum Extrusion: 40mm x 40mm profile for heavy-duty structures
• 8020 Aluminum Extrusion: 80mm x 20mm (or sometimes 80mm x 80mm depending on system), often used for large-scale, industrial builds

What Is 2020 Aluminum Extrusion?

Because it’s so popular, let’s look at what is 2020 aluminum extrusion specifically.

• Size: 20mm x 20mm profile, typically with four T-slots (one on each side)
• Strength: Lightweight but strong enough for small- to medium-sized frames
• Applications: 3D printer frames, laser cutter housings, desktop CNC machines, DIY shelving

This makes 2020 a go-to choice for makers and engineers who need a compact, affordable, and easy-to-work-with material.

When to Use Different T-Slot Extrusions

• Use 2020 / 3030: For lightweight projects, electronics housings, prototypes, and small enclosures
• Use 4040 / 4080: For heavier equipment, workstations, and projects with long spans that need rigidity
• Use 8020 or larger: For industrial automation, machine bases, and large structural frames

Matching your profile size to your load and space requirements ensures a stable and long-lasting build.

Where to Buy 2020 Aluminum Extrusion (and Other Profiles)

When it comes to where to buy 2020 aluminum extrusion and other T-slot profiles, you have several options:

1. Online Marketplaces

• Amazon, eBay, AliExpress: Convenient for hobby projects and quick delivery
• Best for small quantities or when you need a kit with brackets and hardware included

2. Specialty Suppliers

• 80/20 Inc., Misumi, Tnutz, MakerBeam: Offer precision-cut profiles, end machining, and compatible hardware
• Ideal for professional or high-tolerance applications

3. Local Industrial Distributors

• Metal supply shops often carry standard T-slot profiles
• Good option if you need bulk lengths or want local pickup

4. Custom Aluminum Extrusion Suppliers

If standard off-the-shelf profiles don’t meet your design needs, you can order custom T-slot extrusions:

• When to consider custom profiles:
  • Unique slot size or shape required
  • Integrated mounting features designed into the extrusion
  • Very specific strength, wall thickness, or alloy requirements
• Where to get them:
  • Work with aluminum extruders or distributors who offer custom tooling services
  • Some T-slot manufacturers will create a die for you if you meet minimum order quantities

While custom extrusions cost more up front (due to tooling fees), they can reduce assembly complexity and part count, saving money long-term for high-volume or specialized projects.

Tips for Buying T-Slot Aluminum

• Order a bit extra: Having spare material saves time if you make a cutting mistake
• Check compatibility: Not all 2020 or 4040 systems have identical slot widths — make sure hardware matches
• Get the right hardware: T-nuts, corner brackets, and joining plates must fit your chosen profile

Final Thoughts

Whether you need standard profiles or something unique, T-slot aluminum extrusions are one of the most flexible materials for building frames, guards, and enclosures.

If you’ve been searching for what is 2020 aluminum extrusion or where to buy 2020 aluminum extrusion, you now know that 2020 is just one of many available profile sizes. And when your project demands something custom, you can work with an aluminum extruder to design a profile that perfectly fits your requirements.

By combining the right profile size, source, and — when needed — custom solutions, you can create a modular, professional-grade frame that’s built to last.