Do I need to do anything other than wire grommets to protect electrical wiring in a 2 1/2 inch steel stud?
The NEC language for metal studs is different, it doesn't actually say 1.25&quot;, but enforced much the same.

300.4(B) Nonmetallic-Sheathed   Cables  and Electrical  Nonmetallic Tubing  Through Metal   Framing
Members.
(1)  Nonmetallic-Sheathed    Cable. In both    exposed and concealed   locations   where  nonmetallic-sheathed cables  pass    through either  factory-
or    field-punched,  cut,    or
drilled   slots   or  holes   in  metal   members,    the cable   shall   be  protected   by  listed  bushings
or    listed  grommets    covering    all metal   edges   that    are securely    fastened    in  the opening
prior to  installation    of  the cable.
(2) Nonmetallic-Sheathed    Cable   and Electrical  Nonmetallic Tubing.
Where nails   or screws   are likely  to  penetrate   nonmetallic-sheathed    cable   or  electrical  nonmetallic tubing, a   steel   sleeve, steel   plate,  or  steel   clip    not less    than    1.6 mm  (1∕16   in.)
in thickness  shall   be  used    to  protect the cable   or  tubing. Exception:
A listed  and marked  steel   plate   less    than    1.6 mm  (1∕16   in.)    thick   that    provides    equal
or    better  protection  against nail    or  screw   penetration shall   be  permitted.

Sometimes you can drill an extra 1/4&quot; hole to use a zip-tie to pull the cable against one edge to require just one plate or zip-tie toward concrete wall if stud if stud is just furring.
The wording of the previous paragraph that covers wood leaves no wiggle room to not use nail plates on edges not likely to get nailed or screwed to like double walls or furring.