It depends on the DOT cylinder type (for U.S. tanks) not the manufacturer. A 5# aluminum cylinder should be a 3AL2015 and is supposed to weigh 7.6 lbs plus the valve weight. A 10# aluminum weighs 12.9 lbs.
It should also be approx 800 psig when full.
A 5# steel tank weighs 12lbs.
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