sheet metal screws
Metal studs are thin sheet metal. Sheet metal screws are made for this purpose. They are self-tapping.
Use a stud finder that works for metal and wood, mark both edges, drill in the middle.
Your drill (drill bit) needs to be smaller than the threads - preferably about the same diameter as the solid part of the screw (can be eyeballed).
Don't over tighten, just snug - you can yank a hole in the sheet metal or break the screw from you know where.
You can start by drilling a smaller hole, then the final one. Makes drilling easier.
10 or 12 gauge screws will easily handle 10 or so pounds each. 8 gauge a little less.
TVs? Plug type will handle more weight, but you need good drills to make a clean hole that large.
(don't use the expanding rubber type. they're not made to go thru sheet rock and metal, just metal, nor really heavy loads. they'll oooze outa the hole over time.)
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