I started an assembly with two different parts and using "hole feature" i created a hole with fastener through all the two parts, i creat a new study converting the toolbox fasteners to simulation bolt connectors, i set the connection to "no penetration",the fixation and the force to apply on the assembly, everything is done correctely.

I run the study, the results showed that i have penetration between the two parts together ! i found this weird even though i set the connection of the whole assembly to "no penetration" !