Also, when people say “standard” 1/2” pitch chain, that means 1/8” width, (sometimes identified as single speed chain or 3-speed); and that there is another smaller 3/32” width chain for derailleur bikes and some BXM bikes (too small).
And then there is a wider (sometimes called heavy duty) size at 3/16” width (too fat). The heavy “duty” (or service) may actually be independent of the interface size, but have thicker side plates; (i.e., HD 1/2” x 1/8”).