can a 7x12" import bandsaw use a 1/2" wide blade?

If its the horizontal cutoff type, most likely no...there is a lip that the blades rides against that sets the blades width, with the set of the teeth just barely overhanging the opposite edge , and using a narrower blade would flatten the set on the one side of the blade.

If its a vertical type (7 x 12?_) most vertical types can use various width blades.......but yours sounds like a Horiz>===It came with a 3/4"

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