Used on aircraft application. 3a 3rd end bulkhead thread class 12 3rd end bulkhead thread quantity per inch connection style flared all ends; material: steel comp 12L14 or steel comp 1010 cadmium surface treated unj 3rd end bulkhead thread series
2a all ends thread class 20 all ends thread quantity per inch differentiated by: sleeve style (b) MS51825 passivate surface treated unf all ends thread series