Abstract: An installation aid is provided for maintaining a door closed in a door frame during transportation and installation of a door assembly in a building. The installation aid can be used with both interior and exterior doors. The installation aid is a two piece assembly including a first portion which is received in the door and a second portion which is received on the back side of the strike jamb of the door assembly. The first portion has a head, a stem extending from the head, and a threaded shaft at an end of the stem. The second portion includes a washer and an internally threaded boss extending from the washer. The first portion shaft and second portion boss threadedly engage each other to hold the two pieces together, and hence to hold the door in position in the door frame during shipping and installation of the door.