It is difficult to define the hardness of a chain at a popular level in which the loads supported can say a lot and not understand anything.
So my measurement system is colloquial and so that we all understand each other. "Easy" The test consists of hooking the chain with a carabiner to the belt loop of a pair of jeans (Everyone knows that this does not break easily) and stretch until you see which one breaks first.
What do you prefer? a chain that breaks your pants or breaks the chain first... It's not clear, of course, so you decide.
* Break the chain
** Depends... on the pants
*** Sure, don't hesitate, the belt loop of the pants breaks