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Thor DM-21
Part of Thor DM-19
LOx/Kerosene propellant rocket stage. .
 Status: Retired 1969. Thrust: 760.64 kN (170,999 lbf). Gross mass: 48,354 kg (106,602 lb). Unfuelled mass: 2,948 kg (6,499 lb). Specific impulse: 285 s. Specific impulse sea level: 250 s. Burn time: 164 s. Height: 18.41 m (60.40 ft). Diameter: 2.44 m (8.00 ft). Span: 2.44 m (8.00 ft). 
Cost $ : 7.830 million. 
Country: 
USA. 
Engines: 
MB-3-1. 
Launch Vehicles: 
Thor Delta A, 
Thor Ablestar, 
Thor Agena B, 
Thor Ablestar 2, 
Thor DSV-2D, 
Thor Agena D, 
Thor Delta B, 
Thor Delta C, 
Thor Delta C1. 
Propellants: 
Lox/Kerosene. 
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