But since you mention it, I have seen homes with big, thick bars over the windows that the fireman's ax wouldn't be able to cut through. It would take the jaws-of-life to pry them off.
I haven't seen those many times, but you're right, there are houses like that. Good luck breaking through those easily.
Still, even with a 1" throw, I can install a metal door and a metal frame bolted to my metal stud walls, all legally. No way they are just kicking that door down.
Actually, it's still easy to break down that door. The Achilles' Heel you're missing is the hinges. But first, are your metal stud walls the typical commercial steel studs? Those things are paper thin and easily bent; they're only meant for holding up drywall, not for any great strength. What's important is what the door framing is made of. Commercial-grade doors have heavy steel frames, and those would indeed be hard to bust through (regardless of what your wall is made of). However, again, the weak point is the hinges. You can get door-breaching rounds for a shotgun and shoot out the hinges with them. Or you can break down the door with a battering ram, by concentrating on the hinges side rather than the deadbolt side. The deadbolt is a thick, 1" long piece of steel, usually going into an anchor plate or pocket held in with some very long screws. The hinges, OTOH, are usually held in with some very short screws.
>Also, just to be precise, I believe the 1" limit depends on the jurisdiction - my state limits deadbolts to 1" but your mileage may vary.
I don't think I've seen any longer. It's very unlikely a big lock company like Kwikset or Schlage would bother making different-length deadbolts for sale in different states; it's much easier just to manufacture to the lowest common denominator. It's just like cars; once California makes something a mandate, all the automakers just adopt that for all cars sold nationwide.