Which type of mechanical fasteners should be used?

This depends on the application. Manufacturers of mechanical fasteners define selection criteria - see there for details.
Parameters that influence the choice are:

  • belt thickness 
  • construction of the belt (a belt with fabric carcass requires a different design than one with PA traction layer)
  • pulley diameters 
  • surface condition 
  • wear on slider beds 
  • tools needed to mount the fastener
  • appearance