 The O 'Brien class was the third of the five classes of " thousand tonners " . The earlier Cassin- ( DD @-@ 43 to DD @-@ 46 ) and Aylwin @-@ class ( DD @-@ 47 to DD @-@ 50 ) ships were about the same length as the O 'Brien ships and all had median displacements in the range of 1 @,@ 020 – 1 @,@ 050 long tons ( 1 @,@ 040 – 1 @,@ 070 t ) ; the later Tucker- ( DD @-@ 57 to DD @-@ 62 ) and Sampson @-@ class ( DD @-@ 63 to DD @-@ 68 ) ships were about 10 feet ( 3 @.@ 0 m ) longer and had median displacements of 1 @,@ 090 – 1 @,@ 100 long tons ( 1 @,@ 110 – 1 @,@ 120 t ) . All five classes were armed with four 4 @-@ inch ( 102 mm ) guns , but the torpedo size and complement varied . All were equipped with four twin torpedo tubes loaded with eight torpedoes except for the Sampsons ( which had four triple tubes carrying twelve torpedoes ) , but the Cassin and Aylwin classes were armed with 18 @-@ inch ( 457 mm ) torpedoes . The O 'Brien ships were the first armed with the new21 @-@ inch ( 533 mm ) Mark 8 torpedoes ; the Tucker and Sampson ships also used the 21 @-@ inch torpedoes . The Sampsons were the only group originally equipped with anti @-@ aircraft guns , a pair of 1 @-@ pounder ( 0 @.@ 45 kg ) guns with a caliber of 37 mm ( 1 @.@ 46 in ) . 
