rivetto = s.m. (mecc.) rivet: - a testa svasata, countersunk rivet; - filettato, screw (o stud) rivet; - spaccato, split rivet; - tubolare, tubular rivet.

riv·et (r¹v“¹t) = n. 1. A metal bolt or pin having a head on one end, inserted through aligned holes in the pieces to be joined and then hammered on the plain end so as to form a second head.
--riv·et tr.v. riv·et·ed, riv·et·ing, riv·ets. 1. To fasten or secure with or as if with a rivet. 2. To hammer the headless end of so as to form a head and fasten something. 3. To fasten or secure firmly; fix.

Vedi il sito già menzionato.