If you are in an assembly that contains the bolt you are looking for, you can go to the Select Tools tab and create a query and search for file name or other properties. Once your query is executed, any matches will highlight in the assembly.
You can "query" a bolt all you want, but it won't answer because, well... it's a bolt
All joking aside, I think you need to be more clear as to what you are trying to do. Your question is very ambiguous.
It's probably "3-1/4". But what Kevin showed you was how to search your assembly components in Pathfinder based on their name. If their name does not constain the term exactly as your search term, it will not find it.
The name you gave is the one that goes in the doc number or title or where ever you have set it up to go. There is also a file name that will be different, for one thing will not have the fraction slash. You can find it by right clicking on the part and selecting "file properties".
One other thing you can do is find one bolt and select it then pick "select all identical parts" from the "select parts constrained to" drop-down in the select tab in the home menu.