20 Set 78x78mm 2020 Aluminum Extrusion Corner Bracket - Heavy Duty 90

In this review the 20 set 78x78mm 2020 aluminum extrusion corner bracket is examined for builders who need reliable 90 degree connections for 20x20 profile frames. The bottom line: this kit is best for hobbyists and light industrial users who want a cost-effective, sturdy connector set that includes hardware and a wrench, with the single biggest reason to buy being its thick 7mm construction which adds noticeable rigidity to small machine frames and enclosures.

Key Features

• Complete kit: The package includes 20 brackets, 80 screws and nuts, and a wrench so assembly can begin immediately without sourcing fasteners.
• Thick construction: At 7mm thick and made from aluminum alloy, the bracket adds solid support where two 20x20 profiles meet at a 90 degree angle.
• Four-hole design: Each bracket has four mounting holes to spread load and improve joint stiffness for frames and machine enclosures.
• Compatibility: Designed for 6mm slot profiles, the connector fits most 20 series aluminum extrusion systems used in 3D printers and CNC machines.
• Versatile use: Useful for building industrial frames, roof racks for hiding wires, robotics projects, and common workshop fixtures.

Who It's For

The bracket set is aimed at DIY makers, small workshop builders, and light industrial users assembling 20x20 aluminum extrusion frames for 3D printers, CNC routers, laser cutters, or general purpose enclosures who value a ready-to-use pack with matching fasteners. Its heavy 7mm thickness makes it especially suited to projects where joint rigidity matters.

Those working with larger profiles, nonstandard slot widths, or needing stainless hardware for outdoor corrosion resistance should look elsewhere, since this kit is tailored to 20 series aluminum profiles and includes standard alloy fasteners rather than specialized corrosion-resistant options.

Pros & Cons

Pros

• Well-made and sturdy brackets that increase frame rigidity thanks to 7mm thickness.
• Comes as a full kit with 80 screws, nuts, and a wrench so most builds can start right away.
• Simple four-hole pattern makes alignment and assembly straightforward for common 20x20 builds.

Cons

• Some users may find fit varies with certain brands or slightly different slot tolerances, so verification is recommended before large builds.
• Fasteners are standard alloy; projects needing marine-grade or specialty bolts will require replacements.

Specifications

Quantity	20 brackets with 80 screws and nuts and 1 wrench
Bracket size	78x78mm
Profile fit	20x20 series aluminum extrusion (6mm slot)
Material	Aluminum alloy
Thickness	7mm
Mounting	4-hole right angle connector for 90 degree joints

Our Verdict

This bracket kit is a practical, value-focused choice for makers and small shops building with 20x20 aluminum extrusion. It delivers sturdy, easy-to-assemble 90 degree joints thanks to its 7mm thickness and included hardware, making it good value for projects where standard alloy hardware and a simple heavy-duty connector are sufficient.

Frequently Asked Questions

Will these fit any 20x20 profile?
They are designed for 20x20 series with a 6mm slot and fit most common brands, but slot tolerances vary so test one bracket if using an uncommon profile.

Are corrosion-resistant fasteners included?
The kit ships with standard alloy screws and nuts; users who need stainless or marine-grade hardware should replace the included fasteners.

Can these support printer and CNC frames?
Yes, the 7mm thick aluminum construction is well suited to 3D printers, CNC routers, and laser cutter frames where rigid 90 degree joints are needed.