I got used to inserting hardware using Toolbox where I just need to hover over the hole in the part and the hardware would mate automatically.  Now that downloading hardware from sites like mcmaster carr is so easy, I have been doing it more often.  The only problem is that it takes a lot of time to mate them into the assembly. 

How can I add mate refferences to the parts so that they will drop into any holes and mate in place, just like toolbox hardware?  Imagine that I have a sheetmental bracket with a 10 holes and one screw that I want to mate into each hole.  My only method now is to manually add 20 mates.  (or use patterns)

My understanding is that Mate Refferences are more for 2 parts that woudl always go together, like connectors.  I shouldn't have to set up mate references on all of my sheetmetal parts.

How do I do this?