| Official name | SL-4 R/B |
| Alternative name | Blok-I (Soyuz SL-4 (A-2)) |
| Cospar ID | 1972-099B |
| Norad ID | 6312 |
| Launch date | 1972-12-14 |
| Launch site | PKMTR |
| Launch vehicle | Voskhod |
| RCS size | UNKNOWN |
| Decay date | 1972-12-22 |
| Shape | Cyl |
| Mass (kg) | 3221.01 |
| Diameter (m) | 2.66 |
| Height (m) | 8.99 |
| Span (m^2) | 8.99 |






