Terms for subject Chemistry containing threads

English	Italian
screw with constant depth of thread	vite a passo costante
screw with decreasing depth of thread	vite a nocciolo crescente,vite a profondita di filetto decrescente
single-thread	vite ad un principio
single-thread	filettatura ad un principio
thread-forming insert	bussola filettata per stampare filettature esterne
thread-forming insert	tassello filettato