Used on 16n aircraft, viking s-3a. 3a 1st end bulkhead thread class 20 all ends thread quantity per inch anodize inside surface treated unjf all ends thread series
Used on 41n helicopter, ch-53a/d/e. 3a 1st end bulkhead thread class 12 1st end thread quantity per inch passivate inside surface treated unj 1st end thread series
Used on 05a helicopter, chinook, ch-47. 3a 1st end bulkhead thread class 12 1st end bulkhead thread quantity per inch anodize surface treated unj 1st end bulkhead thread series