Long March 12B
| Function | Medium-lift to heavy-lift launch vehicle |
|---|---|
| Manufacturer | China Aerospace Science and Technology Corporation Commercial Rocket Co., Ltd. |
| Country of origin | China |
| Size | |
| Height | ~72 m (236 ft 3 in) |
| Diameter | 4.37 m (14 ft 4 in) |
| Mass | > 437,000 kg (963,000 lb) |
| Stages | 2 |
| Capacity | |
| Payload to LEO | |
| Altitude | 200 km (120 mi) |
| Mass | ~20,000 kg (44,000 lb) expendable, 12,000 kg (26,000 lb) reusable |
| Payload to SSO | |
| Altitude | 500 km (310 mi) |
| Mass | ~12,000 kg (26,000 lb) expendable |
| Associated rockets | |
| Family | Long March |
| Comparable | |
| Launch history | |
| Status | Active |
| Launch sites | Jiuquan, CZ-12 pad |
| Total launches | 1 |
| Success(es) | 1 |
| Failure | 0 |
| First flight | 1 June 2026 |
| First stage | |
| Powered by | 9 × YF102R |
| Maximum thrust | 7,515 kN (1,689,000 lbf) |
| Specific impulse | 275.3 seconds (2.700 km/s) |
| Propellant | RP-1 / LOX |
| Second stage | |
| Powered by | YF-102RV |
| Maximum thrust | 835 kN (188,000 lbf) |
| Propellant | RP-1 / LOX |
The Long March 12B (Chinese: 长征十二号乙运载火箭; pinyin: Chang Zheng 12B, abbreviated LM-12B or CZ-12B), is a Chinese two-stage reusable medium-lift to heavy-lift launch vehicle, a commercially-oriented variant of the Long March 12. Its maiden flight in June 2026, from Jiuquan Satellite Launch Center, was successful, while booster recovery was not attempted.
Both CZ-12B stages are kerolox-fuelled and four meters in diameter. The first stage, powered by nine YF-102R engines, is designed to be reused after stage-recovery via propulsive landing. The second stage is powered by a single YF-102RV engine. The rocket is being developed by the China Aerospace Science and Technology Corporation Commercial Rocket Co., Ltd. (CACL), operating under the state-owned China Aerospace Science and Technology Corporation (CASC).