I was at the local hardware store looking for some spring or threaded links for putting up a hammock. Spring would be more convenient, but not as strong.
They have 3/8 inch threaded links, rated at 2200 lbs like this:
"Do not use for overhead lifting of a load, support of human weight, athletic or playground equipment".
So, what do people use for hanging up a swing o hammock? Sure, this is all legalese to keep the mfg from getting sued and the 2200# stuff will probably hold me just fine. But what do professionals use who might be specing playground equipment? I don't see them ignoring such a warning. So what do they use and end up paying for stuff like this?