Creating M14 Bolts via toolbox. You may add nuts with same way.
Go to "C:\SolidWorks Data\lang\English" (or location you'd chaged while installation) and open SWBrowser.mdb file with MS Access
Find Table "ISO_DATA_BS_HBOLT4017" or any table for other standarts and add a new line for new size with the values* shown.
* CBORE_DIA value found in Matlab with curvefit toolbox using existing values because I cound find any information about Counterbore Diameter in standart tables.
Find table "ISO_DATA_BS_HBOLT4017_LENGTHS" and bolt lenghts for new size.
Now you may generate M14 bolt from toolbox.
Checking dimensions of bolt.
Creating Counterbore Hole via Hole Wizard.
Checking Conterbore and Bolt in an assembly.