We don't have synonyms for pop rivet yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are po river and lap rivet.
(n) :
(metalworking, construction) A blind rivet; a rivet which can be fixed with access only to the factory head end; after passing the bucktail through the items to be secured, the rivet gun is attached to a frangible mandrel through the centre of the rivet, which upsets the bucktail to form the field head and breaks off when the correct pressure has been achieved.
(n) :
(metalworking, construction) A blind rivet; a rivet which can be fixed with access only to the factory head end; after passing the bucktail through the items to be secured, the rivet gun is attached to a frangible mandrel through the centre of the rivet, which upsets the bucktail to form the field head and breaks off when the correct pressure has been achieved.