Hardware to mount pcb/prototype board to metal box?

AI Thread Summary
To mount a prototype board to a metal box, stand-offs are recommended, which are hexagonal rods with tapped holes for securing the board. For thicker metal, stand-offs with threads on one end can be screwed directly into the box, requiring precise hole placement. Alternatively, stick-on plastic standoffs can be used for easier installation. Pre-manufactured enclosures with integrated slots or standoffs are also available for convenience. Overall, selecting the right mounting hardware depends on the box's material and design requirements.
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They are called 'stand-offs'
Little hexagonal rods with a tapped hole in each end - you screw through the box into one end and trhough the PCB into the other
Or you can get stick on plastic ones that glue to the inside of the box and have little plastic barbs that go through the hole in the PCB
 
If you have fairly thick metal, you can get stand-offs that have a thread on one end, allowing you to screw it into the bottom of your box. This works best if you have access to a machine shop with a lathe, or someone that's really good with a drill press. You also need to know exactly where your holes are to be located.

If you just have a sheet metal box, well, the ones with tapped holes are probably the way to go, along with some round head screws through the sheet.
 
Nut inserts probably aren't what you'd want for your application but I thought they would be worth mentioning because they come in handy sometimes. For example, when a "backer plate" is desired in the bottom of an enclosure and you want to put standoffs on it to mount PCBs.

http://www.mcmaster.com/#nut-inserts/=qoac3"
 
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