UNI 5546-1965 Iso metric threads with triangular profile. Limits of size of the coarse class threads with 7h/8g tolerance, for bolts, screws and nuts.
UNI 5544-1965 Iso metric threads with triangular profile. Limits of size of the close class threads with 4h5h/4h tolerance, for bolts, screws and nuts.
UNI 5927-1967 Viti senza testa con esagono incassato ed estremità conica
Filettatura metrica ISO a passo grosso
Con UNI 5923-67, 5925-67 e 5929-67 sostituisce UNI 2384(2<(UP)n>Ed.) Categoria A