A bolt is a unit of measurement

Measurement

Measurement is the process or the result of determining the ratio of a physical quantity, such as a length, time, temperature etc., to a unit of measurement, such as the metre, second or degree Celsius...

 used as an industry standard

Standardization

Standardization is the process of developing and implementing technical standards.The goals of standardization can be to help with independence of single suppliers , compatibility, interoperability, safety, repeatability, or quality....

 for a variety of materials from wood

Wood

Wood is a hard, fibrous tissue found in many trees. It has been used for hundreds of thousands of years for both fuel and as a construction material. It is an organic material, a natural composite of cellulose fibers embedded in a matrix of lignin which resists compression...

 to canvas

Canvas

Canvas is an extremely heavy-duty plain-woven fabric used for making sails, tents, marquees, backpacks, and other items for which sturdiness is required. It is also popularly used by artists as a painting surface, typically stretched across a wooden frame...

, typically materials stored in a roll. The length is usually either 40 or 100 yards but varies depending on the fabric being referred to, for example, a bolt of canvas is traditionally 39 yards. The width of such a bolt can also vary. Widths may include 35–36”, 39”, 41”, 44–45”, 50”, 52–54", 58–60” and 66”, 72", 96", and 108".

External links

• http://www.unc.edu/~rowlett/units/dictB.html#bolt
• http://convert.web-max.ca/index.php?select=8
• http://www.diracdelta.co.uk/science/source/b/o/bolt%20of%20cloth/source.html