3a 2nd end thread class 12 1st end thread quantity per inch machined groove in flared end to accommodate seal ring per KC103 passivate surface treated un 1st end thread series
3a 2nd end thread class fitting shall be polytetrafluoroethylene coated on interal surface only to a distance of 0.220 min 0.270 max in. deep passivate surface treated unjf 2nd end thread series
3 1st end thread class 12 2nd end thread quantity per inch machined groove flared ends to accommodate seal ring per kc 103 passivate surface treated un 2nd end thread series