I need a chain for my vintage build-- I'm using a Suntour Perfect 6 speed freewheel and Suntour Seven derailleurs. Crankset is a SR Royal 52/45. Do I need just a standard 1/2 x 3/32 chain? 114 links? I see all kinds of chains out there.

Any recommendations for a chain?

Thanks

The chain you describe will be fine. (Chains are also designated as 6-7 speed. 8-9 speed, etc., but your bike takes a 3/32.) You will also need a chain breaker tool and some kind of quick link or master link. If it's a Shimano chain, you need one of their master pins. These connecting devices vary according to the make and width of the chain. Many chains come with the appropriate repair link. There are special tools for opening and closing these links, but I have successfully used various no-tool tricks described on the internet.

Most chains i have seen are 6-7-8 speed chains then 9,10,11. So your correct about the 3/32 sizeing and 114 links unless you have some super range freewheel where you might need 116

Any "8-speed" chain will work fine. Back when your Schwinn was new (and I was working in bike shops) derailleur chains had 112 links and then we shortened them to appropriate length. Here's several techniques for determining the correct length: Park Tool Co. » ParkTool Blog » Chain Length Sizing

I like SRAM PC-850 myself. Good longevity for the buck.