ISO 13921:1996

ISO 13921:1996 Aerospace - Screws, 100 degrees reduced countersunk head, internal offset cruciform ribbed or unribbed drive, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa - Dimensions

standard by International Organization for Standardization, 08/01/1996