Ten Pack 4040 Inside Corner Bracket Gusset For 4040 Aluminum Extrusion Profile 40x40x35mm With 8mm Slot Black Built For Industrial Frames, 3D Printers, CNC Routers And Robotics Projects
✔️ Pack of 10, 40x40x35mm / 1.57x1.57x1.38 in, 8mm slot, black finish.
These black inside corner brackets (L-joint plates) are designed to join 4040 aluminum extrusion profiles into sturdy, square-frame assemblies. They’re commonly used to form industrial frames, 3D printers, CNC routers, laser cutters, and robotics builds where reliable corner joints matter.
✅ 4040 inside corner bracket with 8mm slot
✅ 40x40x35mm overall size / 1.57x1.57x1.38 in
✅ Black anodized aluminum for rust resistance
✅ Simple joint plates for printer, router, and robotics frames
✅ Pack of 10 pieces for multiple assemblies
💡 What is a corner bracket used for in aluminum extrusion framing?
These handy brackets provide solid 90-degree joints for 4040 frames, helping keep assemblies square and reliable under load.
- 4040 extrusion corner bracket for strong joints- 8mm slot compatibility with common fasteners
- Durable aluminum alloy with rust resistance
- Ideal for 3D printers, CNC routers, and robotics frames
Product Information
Product Information
Shipping & Returns
Shipping & Returns




Ten Pack 4040 Inside Corner Bracket Gusset For 4040 Aluminum Extrusion Profile 40x40x35mm With 8mm Slot Black Built For Industrial Frames, 3D Printers, CNC Routers And Robotics Projects
Ten Pack 4040 Inside Corner Bracket Gusset For 4040 Aluminum Extrusion Profile 40x40x35mm With 8mm Slot Black Built For Industrial Frames, 3D Printers, CNC Routers And Robotics Projects
✔️ Pack of 10, 40x40x35mm / 1.57x1.57x1.38 in, 8mm slot, black finish.
These black inside corner brackets (L-joint plates) are designed to join 4040 aluminum extrusion profiles into sturdy, square-frame assemblies. They’re commonly used to form industrial frames, 3D printers, CNC routers, laser cutters, and robotics builds where reliable corner joints matter.
✅ 4040 inside corner bracket with 8mm slot
✅ 40x40x35mm overall size / 1.57x1.57x1.38 in
✅ Black anodized aluminum for rust resistance
✅ Simple joint plates for printer, router, and robotics frames
✅ Pack of 10 pieces for multiple assemblies
💡 What is a corner bracket used for in aluminum extrusion framing?
These handy brackets provide solid 90-degree joints for 4040 frames, helping keep assemblies square and reliable under load.
- 4040 extrusion corner bracket for strong joints- 8mm slot compatibility with common fasteners
- Durable aluminum alloy with rust resistance
- Ideal for 3D printers, CNC routers, and robotics frames
Original: $39.59
-65%$39.59
$13.86Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
✔️ Pack of 10, 40x40x35mm / 1.57x1.57x1.38 in, 8mm slot, black finish.
These black inside corner brackets (L-joint plates) are designed to join 4040 aluminum extrusion profiles into sturdy, square-frame assemblies. They’re commonly used to form industrial frames, 3D printers, CNC routers, laser cutters, and robotics builds where reliable corner joints matter.
✅ 4040 inside corner bracket with 8mm slot
✅ 40x40x35mm overall size / 1.57x1.57x1.38 in
✅ Black anodized aluminum for rust resistance
✅ Simple joint plates for printer, router, and robotics frames
✅ Pack of 10 pieces for multiple assemblies
💡 What is a corner bracket used for in aluminum extrusion framing?
These handy brackets provide solid 90-degree joints for 4040 frames, helping keep assemblies square and reliable under load.
- 4040 extrusion corner bracket for strong joints- 8mm slot compatibility with common fasteners
- Durable aluminum alloy with rust resistance
- Ideal for 3D printers, CNC routers, and robotics frames























