The inside link inner width of any 3/32 chain meant for multi-speed systems in nominally 3/32" but the total outer width varies between 6-8, 9 and 10 speed chains, because the freehub cogs are spaced differently depending on the number of sprockets. So a 10 speed chain is narrower overall than a 6-8 speed chain. None of this really matters on a single speed setup with a 3/32 chainring and cog. You can always use a 1/8 chain, regardless. I have never tried to use a 10 speed chain on a SS/FG, but I have used a 6-8 speed chain without any problems.