3a 2nd end thread class first end is accordance with MS33656 style g, second is accordance with MS33514 style g third end is accordance with MS24385 style g unjf 2nd end thread series
3a 1st end thread class 12 1st end thread quantity per inch machined groove in flared ends to accommodate seal rings per KC103 passivate inside surface treated un 1st end thread series
3a 2nd end thread class 12 1st end thread quantity per inch 1st end bulkhead, 1.062-12 in. unj, cl 3a anodize surface treated unj 1st end thread series