American 21-inch torpedo

21 inch (533 mm)21 inAmerican 21 inch torpedo21 in (533 mm)21-inch (533 mm)2121 in (63 cm)21 in.
There have been a number of 21 inch torpedoes in service with the United States.wikipedia
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Bagley-class destroyer

BagleyBagley''-classBagley class
Their layout was based on the concurrently-built Gridley class destroyer design and was similar to the Benham class as well; all three classes were notable for including sixteen 21 inch (533 mm) torpedo tubes, the heaviest torpedo armament ever on US destroyers.

Benham-class destroyer

BenhamBenham'' classBenham''-class
The Benhams had the same armament as the Gridleys and Bagleys: four 5-inch/38 caliber dual purpose guns (anti-surface and anti-aircraft (AA)) in single mounts and sixteen 21 inch (533 mm) torpedo tubes in quadruple mounts. The Mark 15 torpedo was equipped. This was the heaviest armament in torpedoes ever on US destroyers. Compared with the Mahans, they sacrificed one gun for four additional torpedo tubes. It was suggested that these ships could use "curved ahead fire", using the adjustable post-launch gyro angle of their torpedoes to launch a sixteen-torpedo spread ahead of the ship. One reason for the heavy destroyer torpedo armament was that, alone among the major navies, the last nine of the seventeen US Treaty cruisers built in the 1920s and 1930s lacked torpedoes; eventually all of the US Treaty cruisers' torpedoes were removed in 1941 in favor of additional heavy AA guns.

Mark 35 torpedo

Mark 41 torpedoMark 35Mark 41
*American 21 inch torpedo

Chester-class cruiser

Chester''-class cruiserChesterChester'' class
The as-built armament included two 5 in/50 caliber Mark 6 guns, six 3 in/50 caliber rapid fire (RF) guns, and two 21 inch (533 mm) torpedo tubes.

Mark 45 torpedo

Mark 45 nuclear torpedoMark 45Mk 45 ASTOR
*American 21 inch torpedo

O'Brien-class destroyer

O'Brien'' class
As built, they were armed with four 4 in guns and had four twin 21 inch (533 mm) torpedo tubes with a load of eight torpedoes, but all were later equipped with depth charges.