Used on t-58 aircraft engine. 3a 1st end bulkhead thread class 12 1st end bulkhead thread quantity per inch passivate surface treated unj 1st end bulkhead thread series
3a all ends thread class 12 all ends thread quantity per inch 1st end bulkhead, 1.062-12 in. un, cl 3a anodize surface treated un all ends thread series
Used on full-tracked light recovery vehicle. 3a 3rd end bulkhead thread class 12 3rd end bulkhead thread quantity per inch cadmium surface treated unj 3rd end bulkhead thread series
3a 3rd end bulkhead thread class color yellow; filtered restrictor, 0.187 in. dia, 0.550 in. lg passivate surface treated unjf 3rd end bulkhead thread series