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UNE 38302:1971 ALUMINIUM AND ITS ALLOYS FOR FORGING. COMMERCIAL EQUIVALENCES.
UNE 25166:1971 SELECTIVE LIST OF COUNTERSUNK HEAD SCREWS WITH SET BOLT (RUGGED OR WITH SUPERFICIAL PROTECTION).
UNE 25172:1971 SELECTIVE LIST SCREWS OF COUNTERSUNK HEAD, FLATHEAD OR TELLOW DROP, WITH SUPERFICIAL PROTECTION OR WITHOUT IT.