Status: Out of Production. Date: 1965-72. Thrust: 390 N (80 lbf).
| Stepanov IS/US 16 kgf Stepanov N2O4/UDMH rocket engine. IS/US. Out of Production. |
| Stepanov IS/US 1 kgf Stepanov N2O4/UDMH rocket engine. IS/US. Out of Production. |
| Stepanov LK/LOK 10 kgf Stepanov N2O4/UDMH rocket engine. LK/LOK attitude. Out of Production. |
| Stepanov LK/LOK 40 kgf Stepanov N2O4/UDMH rocket engine. LK/LOK attitude. Out of Production. |