3a 1st end bulkhead thread class color yellow; drill no. 7, 0.201 in. dia, 0.562 in. deep, tap 0.250-20unc-2b thsd size, 0.438 in. deep per mil-s-7742 unjf all ends thread series
3a all ends thread class color yellow; threaded 0.250-unc-2a thd size; 0.250 in. dia, 0.250 in. lg passivate surface treated flared w/ center wrenching facility unjf all ends thread series
Used on torpedo, mk-48. right-hand external 0.710" overall length 20 external thread quantity per inch weapon system essential plug, tube fitting flareless (note: drilled hole is optional should not be considered as a separating characteristic unf external thread series