Tube plugs are a great way to interface 1x1 and 2x1 box tube with other surfaces. They are especially convenient when clearance is an issue and gussets aren't an option. To use, drill a hole in the box tube, line the threaded portion of the Tube Plug up with the hole, and insert your fastener.

These tube plugs are designed to be used with different thicknesses of Box Tube Extrusion. The Tube Plugs that perfectly nestle into Box Tube with 0.063 in. thick walls are designed and manufactured by SDS.