1. In masonry, a dimension greater (by the thickness of a mortar joint) than the dimensions of the actual masonry unit; in the United States, not exceeding ½ inch (13 mm). 2. In lumber, a dimension that may vary from the actual dimensions as provided for in the local building co...
The dimensions of sawn lumber before it is dried or surfaced. Also seedressed size. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. Want to thank TFD for its existence?Tell a friend about us, add a link to this page, or visitthe...
Pipes are identified by "nominal" or "trade" names that are loosely related to the actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. In plumbing pipe size is referred to as nomi...
In process piping the term nominal simply refers to the name of the pipe, much like a 2″ × 4″ piece of lumber. A 2″ × 4″ board does not actually measure 2″ × 4″, nor does an 8″ pipe actually measure 8″ in diameter. It is just a convenient and easy way to identify...