3a 2nd end thread class 12 1st end thread quantity per inch KC144C12-4; machined groove in flared ends to accommodate seal rings per KC103 passivate surface treated un 1st end thread series
3a 2nd end thread class KC144C6-10; machined groove in flared ends to accommodate seal rings per KC103 passivate surface treated unf 1st end thread series
3a 2nd end thread class KC144C4-10; machined groove in flared ends to accommodate seal rings per KC103 passivate surface treated unf 1st end thread series
3a first fluid end connection thread class 3.672" overall length 14 first fluid end connection thread quantity per inch anodize surface treated coupling assembly unf first fluid end connection thread series