Lightweight loose pin butt hinge. A loose pin butt hinge that has a centre pin that can be easily removed from the barrel to separate the hinge. Also sometimes called removable pin hinges. Â The advantage of having a loose pin hinge is that the door can be uninstalled without having to remove the hinge from either the door or the door jamb. Â The pin can be tapped out (upwards) of the hinge to allow the door to be lifted away with little effort.