Note for "standard" parts (e.g. nuts/bolts/washers) you can "pre-define" assembly constraints in the component part. (if part families, this can be done in the part family master)
Then you only have to choose geometry on part it is being constrained TO.
For nuts/bolts/washers, a "concentric" constraint seems to be the least picks, but you may prefer something else.
Production: NX10.0.3.5 MP5 + patch/TC11.2
I'd rather be steemed than diseaseled