bottom plate screws: all the same?

[DDXdesign]

So I'm making a new accessory thing and am curious how many different sorts of bottom-plate screws/bolts there are, though I have a limited amount of different pedals to check firsthand at the moment. They seem to be all about the same diameter at about an M3 or 1/8"-ish, but some have countersunk heads and some have pan heads and some, like a couple of my MXRs, have boxy allen-wrench heads - not to mention differing lengths and such. Is there a universal, or near-universal diameter+pitch+thread here, with the 'style' just being manufacturer's preference?

TIA
Dave

 

[theunknowndude]

So I'm making a new accessory thing and am curious how many different sorts of bottom-plate screws/bolts there are, though I have a limited amount of different pedals to check firsthand at the moment. They seem to be all about the same diameter at about an M3 or 1/8"-ish, but some have countersunk heads and some have pan heads and some, like a couple of my MXRs, have boxy allen-wrench heads - not to mention differing lengths and such. Is there a universal, or near-universal diameter+pitch+thread here, with the 'style' just being manufacturer's preference?

TIA
Dave

I’ve only taken a few apart (change a few dip switches or try to fix a broken one… I don’t use battery) from various brands like boss, mxr and solid gold fx… they all seem different yet similar diameter like you found?
Maybe @johnk_10 or some other builders can confirm…

 

[agedhorse]

There are a variety of sizes used, including M3, M3.5, 4-40 and 6-32