Will these work with my factory wheel studs?

Yes—M12x1.25 is a common metric stud size. Verify your vehicle uses this thread pitch before ordering. If unsure, measure an existing lug nut or check your service manual.

Do I need to torque these differently than steel lug nuts?

Follow your vehicle manufacturer's recommended torque spec—it applies regardless of material. Aluminum seats the same way as steel; the knurled surface just makes hand-snugging easier during installation.

Can these be reused or are they single-use?

These are reusable. Remove them cleanly, store in a dry place, and reinstall on future wheel changes. Inspect the threads and acorn cap for damage before reuse.