5 Pack Inside Corner Brackets Gusset 77x77x36mm For 4040 And 4080 Aluminum Extrusion Rails Beefy Right Angle Connectors Silver Finish Heavy Duty DIY Friendly Easy Mounting

Beefy Corner Brackets for 4040/4080 Aluminum Extrusions
✔️ 77x77x36mm, 5-pack, aluminum die-cast, 8mm & 25x8.5mm holes

These aluminum inside corner gusset brackets are designed for 4040 and 4080 extrusion rails. They create strong right-angle joints for industrial frames, DIY machines, 3D printers, CNC routers, robotics, and woodworking setups.

✅ Size/holes: 77x77x36 mm, four holes (8 mm dia and 25x8.5 mm slots)
✅ Material: aluminum die-cast alloy with sandblasted finish for rust resistance
✅ Mounting: insert into profile grooves and tighten with screws for a strong joint
✅ Compatibility: fits 4080 Series profiles; ideal for industrial frames, printers, CNCs, robotics
✅ Package: 5 brackets per pack; bolts, nuts, washers not included

💡 What is an aluminum corner bracket used for in modular framing systems?

This handy connector helps you build sturdy right-angle joints quickly and reliably.

- Handy for quick frame construction in DIY projects - Supports CNC machines, 3D printers, and workstation frames - Works with standard fasteners and 4080/4040 extrusion grooves