BS 05/30128680 DC ISO 5856. Aerospace. Screws, 100 degrees normal 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. Dimension

standard by BSI Group, 02/02/2005