STAINLESS STEEL Lock Jam Nut -CASTED. NPT THREAD. -MEETS NPT SPECIFICATIONS ANSI B1.20.1 --TEMP RANGE -60 - 250 FAHRENHEIT. -Rated WOG Water ,Oil and Gas. -Listed picture details quality finish and type. -please reference NPT sizing chart when ordering to verify, the correct size needed is being ordered. FAST SHIPPING