Any stud in an exterior wall or bearing partition shall be permitted to be cut or notched to a depth not exceeding 25 percent of its width. Studs in nonbearing partitions shall be permitted to be notched to a depth not to exceed 40 percent of a single stud width.

Can U drill into a stud?

You most certainly can drill into metal studs, you may not be able to with a very low end drill as proper metal drilling bits are a definite necessity, bits for drilling wood simply won’t get the job done.

Why can't I drill into a stud?

The reason why you can’t drill through a stud could be a dull drill bit, failed drill battery, wrong drill rotation direction or an impenetrable metal/steel member of the wall structure.