Hi David,
.. no I'm sorry, but I don't know any Creo library with this function - I know what you mean, but with Creo library do you need to know type and dimension for your models (bolt, nut, gear, bearing, etc.)
I'm using this library: http://www.ipmsolutions.sk/prolibrary/
Regards,
Vladimir
Note: program is in English but for web page try to use Google translate (Slovak to English) - or I can send for you direct contact 