Short ton

The short ton, also known as the US ton, is a measurement unit equal to. It is commonly used in the United States, where it is known simply as a ton; however, the term is ambiguous, the single word "ton" being variously used for short, long, and metric tons.
The various tons are defined as units of mass. They are sometimes used as units of weight, the force exerted by a mass at standard gravity. One short ton exerts a weight at one standard gravity of 2,000 pound-force.

United States

In the United States, a short ton is usually known simply as a "ton", without distinguishing it from the tonne, known there as the "metric ton", or the long ton also known as the "imperial ton". There are, however, some U.S. applications where unspecified tons normally mean long tons or metric tons.
Both the long and short ton are defined as 20 hundredweights, but a hundredweight is in the US system and in the imperial system.
A short ton–force is.