Abstract: A post and panel mounting system for assembling office partitions uses a hinge arrangement which enables the panels to be positioned at any desired angle to one another. The hinge includes a pivot member in a pivot bracket which is mounted in a narrow horizontal channel in the end of the panel. A radial arm connected to the pivot member protrudes from the channel and has an enlarged head which fits into a vertical slot in a post bracket on the post. Spaced a short distance along the radial arm from the head is an annular flange which abuts the post bracket to hold the panel at a fixed distance from the post. To angularly position the panel relative to the post, the panel is pivoted about the pivot member on an axis inside the end of the panel. The end of the panel is rounded so as to maintain close spacing between the post and panel at all angles.