UNI 5737-1977
Metric hexagon head bolts
UNI 5739-1965
Hexagon head screws threaded up the head
UNI 5712
Hexagon bolts with large width across flats for high strength structural bolting
UNI 5740
Hexagon head bolts with fine pitch thread
UNI 5725
Hexagon head bolts-Full thread
UNI 5738
Hexagon head bolts with fine pitch thread