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@Dutch_Cheese
These are nominal sizes and don't give too much precise bicycle related information.
Nearly all bike chains are 1/2" (pitch) and 3/32" (roller width).
Except 10mm pitch Shimano Dura Ace 10 chains and very, very old 1" pitch "block"chains, all bike chains have 1/2" pitch.
Typical single speed chains are 1/8" wide, although many single speed bikes use a 3/32" wide chain (roller width).
Derailleur bikes typically use 3/32" wide chains, but this is a nominal size. This used to be the correct specification for use with 5 and 6 speed freewheels. For derailleur chains, we speak about overall width (pin length) now. Chains have become more narrow when the number of sprockets increased. A bit over 7 mm => 7mm => less than 7 mm => 5.9 mm => ...
It really depends on the brand and number of gears they've designed it for.
So, the the specs of the developers of the gear components and the chains.