I have a bunch of 304 stainless steel shelf L brackets, they are thick brackets, ~6 gauge steel (5mm). They have 5 holes, long side has 3, and the short side has 2. All are 5mm in diameter, though they came with no fasteners.
The problem is that a screw should be 2 3/4 in (2.75 in) minimum length, to be strong in the stud, correct? I have plaster and lath walls, and I think they are slightly thicker than standard drywall.
What the hell can I do? The longest M5 Metric lag is 60mm, (2.3622 inches).
What should I do? How should I secure the the bracket to the stud in the wall? What about securing the bracket to the shelf? Keep in mind this is stainless, so that means using fasteners that won't corrode fastening something stainless.