S 5.2     Propellant: Chamber pressure: 67 atm Thrust: 14,918 kgf (v) Thrust: 13,470 kgf (sl) S 5.2 Propellant: Vehicles: Hwasong, Shahab, Qiam, Al-Hussein, Burkan   (1 st.) Vehicles: Paektusan-1   (2 st.)    Nodong    Propellant: Chamber pressure: 89 atm Thrust: 28,440 kgf (sl) Burn time: 120 s Vehicles: Safir   (1 st.) First flight: 1998    Nodong    Propellant: Chamber pressure: 89 atm Thrust: 28,440 kgf (sl) Burn time: 120 s Vehicles: Paektusan, Uha 2   (1 st.) First flight: 2006    Nodong +    Propellant: Chamber pressure: 89 atm Thrust: 33,225 kgf (v) Thrust: 30,407 kgf (sl) Burn time: 120 s Specific impulse: 255 s (v) Specific impulse: 232 s (sl) Vehicles: Uha 3  (1 st.) Vehicles: Safir, Simorgh  (1 st.) First flight: 2012    Pektusan-A1    Propellant: Chamber pressure:82 atm Vehicles: Hwasong-12, -14, -16    Pektusan-B1    Propellant: Chamber pressure:82 atm Vehicles: Hwasong-12A    Pektusan-A2    Propellant: Chamber pressure:82 atm Thrust: 89,836 kgf (sl) Burn time: 120 s Specific impulse: 300 s (v) Specific impulse: 269 s (sl) Vehicles: Hwasong-15, -17 Vehicles: Chollima-1  (1 st.)    LRE-4    Propellant: Chamber pressure: 158 atm Thrust: 1.800 kgf (v) Vehicles: Paektusan    (2 st.) Vehicles: Safir   (2 st.)    LRE-4+    Propellant: Chamber pressure: 158 atm Thrust: 1.804 kgf (v) Vehicles: Uha 2 / 3 (1 st.) Vehicles: Safir, Simorgh  (3 st.)    LRE-15    Propellant: Thrust: 3,399 kgf (v) Thrust: 3,749 kgf (v) Vehicles: Simorgh   (verniers)    LRE-X    Propellant: Thrust: 3,186 kgf (v) Vehicles: Uha 2 / 3   (2 st.)    KRE-75     Propellant: Thrust: 76,274 kgf (v) Thrust: 66,944 kgf (sl) Specific impulse: 298 s (v) Specific impulse: 261 s (sl) Vehicles: KSLV-2    (1 st.) First flight: 2022    KRE-75 vac     Propellant: Thrust: 80,710 kgf (vl Specific impulse: 315 s (v) Vehicles: KSLV-2    (2 st.) First flight: 2022    KRE-07v     Propellant: Thrust: 6,995 kgf (v) Specific impulse: 325 s (v) Vehicles: KSLV-2    (3 st.) First flight: 2022    RD-868    Propellant: Thrust: 249 kgf (v) Specific impulse: 325 s (v) Vehicles: Vega   (4 st.) First flight: 2012    Rutherford-1     Propellant: Thrust: 2,475 kgf (v) Thrust: 2,475 kgf (sl) Specific impulse: 272 s (sl) Specific impulse: 327 s (v) Vehicles: Electron    (1 st.) First flight: 2017    Rutherford-1 vac     Propellant: Thrust: 2,263 kgf (v) Specific impulse: 330 s (v) Vehicles: Electron    (2 st.) First flight: 2017