Short ton

The Wire Bridge in New Portland, Maine, United States, with a 3-ton gross weight limit. The short ton is primarily used in the US.

General information
Unit system| United States customary units
Unit of| Mass
In base units| 2,000 lb
Conversions
1 short ton in ...| ... is equal to ...
SI base units|  907.18 kg
Metric tons|  0.90718 t
Long tons|  0.893 long tons

The short ton (abbreviation: tn[1] or st[2]), also known as the US ton,[3] is a measurement unit equal to 2,000 pounds (907.18 kg). It is commonly used in the United States, where it is known simply as a ton;[1] 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.[4] They are sometimes used as units of weight, the force exerted by a mass at standard gravity (e.g., short ton-force). One short ton exerts a weight at one standard gravity of 2,000 pound-force (lbf).

## United States

In the United States, a short ton is usually known simply as a "ton",[1] without distinguishing it from the tonne (1,000 kilograms or 2,204.62 pounds), known there as the "metric ton", or the long ton also known as the "imperial ton" (2,240 pounds or 1,016.05 kilograms). There are, however, some U.S. applications where unspecified tons normally mean long tons (for example, naval ships)[5] or metric tons (world grain production figures).[citation needed]

Both the long and short ton are defined as 20 hundredweights, but a hundredweight is 100 pounds (45.36 kg) in the US system (short or net hundredweight) and 112 pounds (50.80 kg) in the imperial system (long or gross hundredweight).[1]

A short ton–force is 2,000 pounds-force (8,896.44 N).

## See also

* Tonnage, volume measurement used in maritime shipping, originally based on 100 cubic feet (2.83168 m3).

## References

1. ↑ 1.0 1.1 1.2 1.3 "NIST Handbook 44 Specifications: Handbook 44 – 2023 Appendix C – General Tables of Units of Measurement". November 18, 2022. p. C-7. https://www.nist.gov/system/files/documents/2023/01/30/appc-23-HB44.pdf. "20 hundredweights = 1 ton"
2. ↑ "What is a short ton vs long ton? – Sage-Answers". https://sage-answers.com/what-is-a-short-ton-vs-long-ton/.
3. ↑ AME (2018-04-03). "Ton vs Tonne, what's the difference? Which one is heavier?" (in en). https://www.asseteng.com.au/blog/whats-difference-ton-tonne-one-heavier/.
4. ↑ Butcher, Crown and Gentry, NIST Special Publication 1038, The International System of Units (SI) – Conversion Factors for General Use, 2006
5. ↑ "Naval Architecture for All". United States Bureau of Transportation Statistics. http://ntl.bts.gov/DOCS/narmain/narmain.html.

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