Interim Hinge
Above is pictured an interim hinge, used when your door and your frame have different sized hinge preps. For example, your frame is prepped for a five-inch by four-and-a-half inch hinge and your door is prepped for a four-and-a-half by four-and-a-half inch hinge. Why would you need such a thing? Inability to read a tape measure, perhaps?
Wide Throw Hinge
The hinge above is a wide throw hinge, used when you have a thick molding applied to the pull side face of the door frame. My illustration below shows the difference.
Sometimes people order wide throw hinges by accident because they do not know how to properly measure a full mortise hinge. Full mortise hinges are measured height first, then width. Wide throw hinges have a width that is greater than the height whereas standard hinges do not So if, for example, you order a 5 x 4-1/2 inch hinge you are getting a standard hinge and if you order a 4-1/2 x 5 inch hinge you are getting a wide throw hinge.
Half Mortise and Half Surface Hinges
In the picture above, the half mortise hinge is on the left and the half surface hinge is on the right. As you can see by the “application’ drawings below each hinge, the half mortise hinge has the mortise prep on the door, and the half surface has the mortise prep on the frame. You can tell the half mortise at a glance because the surface leaf is narrow, for installation on the surface of the frame.
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