Active , Reaffirmed Standard
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UNE-EN 3543:1997 (R2018)

AEROSPACE SERIES. SCREWS, 100º COUNTERSUNK NORMAL HEAD, OFFSET CRUCIFORM RECESS, CLOSE TOLERANCE NORMAL SHANK, SHORT THREAD, IN HEAT AND CORROSION RESISTING STEEL, PASSIVATED. CLASSIFICATION: 1 100 MPA (AT AMBIENT TEMPERATURE)/425 ºC.