Mechanical framing in the nature of metal structural frame sections for use in a wide variety of applications, including as machinery framing, furniture framing, door framing, window framing, building wall framing, building ceiling framing, building foundation framing, scaffolding framing; framing for performance stages; framing for trestles; component parts for the aforesaid framing, namely, metal corners, hinges, plates for attaching hinges, slides for window and door framing, and connectors for connecting the framing together