CSN EN 6105 This European Standard specifies the dimensions, tolerances, required characteristics and mass of a stud for use in fuselage interior equipment and structural applications. This standard shall be used in conjunction with retaining washer per EN6090A01 (conform to EN 6090) and receptacles per EN 6092 or EN 6093. Original English text of CSN EN Standard. The price of the Standard included all amendments and correcturs.