14:08 Nov 1, 2006 

Esto es lo que me hace confundir:

mil [1]
a unit of distance equal to 0.001 inch: a "milli-inch," in other words. Mils are used, primarily in the U.S., to express small distances and tolerances in engineering work. One mil is exactly 25.4 microns, just as one inch is exactly 25.4 millimeters. This unit is also called the thou. With the increasing use of metric units in the U.S., many machinists now avoid the use of "mil" because that term is also a handy slang for the millimeter.

mil [2]
a unit of angle measure, used in the military for artillery settings. During World War II the U. S. Army often used a mil equal to 1/1000 of a right angle, 0.1 grad, 0.09°, or 5.4 arcminutes (often written 5.4 moa; see "moa" below). More recently, various NATO armies have used a mil equal to 1/1600 right angle, or 0.05625° (3.375 moa). In target shooting, the mil is often understood to mean 0.001 radian or 1 milliradian, which is about 0.0573° or 3.43775 moa. In Britain, the term angular mil generally refers to the milliradian. 1 milliradian corresponds to a target size of 10 millimeters at a range of 10 meters, or 3.6 inches at 100 yards.

mil [3]
a common slang name for the milliliter (mL) or the millimeter (mm).

14:05 Nov 1, 2006 

El texto es para los Estados Unidos.
Yo había visto el enlace que me enviaste, y ahora dudo si se trata de milésimas de pulgada (como dice allí) o milímetros (en slang), como dice también el texto...
Gracias por tu ayuda.
Saludos!!
María