Abstract: A ceiling suspension grid system is provided in which cross tees are assembled to main beams by pushing tabs in the web of one through a corresponding slot in the web of the other. The slots and webs are vertically oriented. Each slot is provided intermediate its height with at least one wide place of comparatively small vertical extent. The tabs are provided with correspondingly thickened bosses, but at slightly vertically displaced sites, so that two elements which are to be connected are oriented at slightly different levels so that the tab of one may be inserted through the slot of the other. Then, upon these elements being brought to a common level, the tab cannot be withdrawn from the slot. By preference, the tabs of two longitudinally adjoining elements may be inserted in the same slot from opposite directions, and become disposed one over the other with the element ends being notched to accommodate the tabs of one another.