Aluminum Structural Framing Connections

Below is a PDF chart on how to select connection elements. It indicates what is connection element is suitable for certain applications. Bosch Rexroth: Selection Criteria for Connection Elements
Nuts and Bolts

T-nut/collar screw or Flange nut/T-bolt
- Used in combination for attaching something directly to a slot
Sliding blocks
- Used to replace a T-nut if a stronger connection is needed
Straddling nut
- Used to replace a T-nut if a very light load is used.

Brackets

Tensioning connector
- Used to attach 2 profiles at a 90degree angle. Very quick assembly.
Inner bracket
- Used to attach 2 profiles at a 90degree angle. Fully concealable.
Miter bracket
- Used to attach 2 profiles at a 90degree angle. Will work if profile ends are miter cut.
Heavy duty connector
- Used to attach 2 profiles at a 90degree angle. Useful for very high load applications.
Bracket
- Used to attach 2 profiles at a 90degree angle. The most simple and cost effective option but is not concealable.
Angle piece R
- Used to attach 2 profiles at any angle.

Profile connector
- Used to attach 2 profiles at their faces. Fits between the slots of the profiles as a bridge. Using 2 of these in opposing slots is the preferred usage.
End connector
- Used to attach 2 profiles at their faces. This is a 2 piece connection that first connects to the ends of the profiles with a central bolt then to each other with 4 screws which can be accessed by the slots.

Central bolt:
- Used to attach something to the central hole in a profile. Self tapping so finishing is not required. Lowest cost but least versatile connection. Drilling holes in profiles may be required depending on the application.

Anti-Torsion element
- Added opposite of a central bolt connection to increase torsion resistance.

Cubic connector
- Used to attach 2 or 3 profiles at their ends at 90degree angles.

Corner bracket
- Has the same application as the cubic connector but with a rounded aesthetic.