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Steel weighs .283 lbs./ cu. in. One of the most useful numbers is: one square foot of 1" steel weighs 40#

(really 40.8#)

So, quick math says a square 1/4" thick being on quarter the dimension, is 10 #,1/8" is 5#, etc.

A 1" square bar 12' long is 40#, or 3.3# foot x 20'= 66#

A 3" square tube with 1/4" wall one foot long is nothing but a one square foot piece folded up, it's 10# also.

(On the site: http://www.weldingweb.com/showthread.php?t=5463)

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