Since the metal bed frame dimensions are set for a full size mattress you will need to loosen the fasteners and make the bed frame 6 inches wider and 5 inches longer so the queen size mattress fits.
Can you put a full mattress on a queen bed frame.
If you are okay with a three inch overhung then it s okay to put a queen mattress onto a full platform bed.
To put a queen size mattress on a double sized iron bed with a frame that is welded onto the headboard and footboard install a set of 4 l shaped brackets to the metal side rails allowing a.
Other beds have a four sided metal mattress support frame that adjusts to different widths to support a twin full or queen size bed.
For the bed with a wooden headboard and foot board and two metal mattress support bars check to see if the support bars are adjustable and can adjust from 80 inches for a queen size bed to the 75 inches for a full size bed.
Plus many of the full platform beds can easily accommodate a standard queen size bed box which is great.
You do not have to adjust the bed frame very much.
Only a queen bed frame that uses extensive cross support such as a frame that uses a large number of wooden slats would be able to support a full sized mattress.
The platform also provides excellent support to the mattress so you will not have to worry about it sagging.
Some beds have two metal mattress support bars on both sides that connect to the headboard and foot board.