When only one number is given as the size of a round lamp shade, it is the diameter of the bottom of the shade. If the shade is oval, the diameter is taken to be the longest distance across the bottom. If the shade is polygonal –a square or hexagonal, for example – it is the distance from one point on the bottom of the shade to the opposite point.
When the size is stated as “A × B × C,”
The top fitting of most shades is a washer with a 5/16 inch hole, to fit over the ¼-27 stud on a harp.
“Uno” shades have a threaded 1½ inch hole that is meant to screw onto the threads on a socket. Shades with large unthreaded rings are meant to sit on a glass chimney.
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Last revised: 20 December 2002.