The following information was copied from: Nuclear ABMs of the USA
Nike Zeus B was a far more capable missile than the A version due to a number of factors. It had a greater range, it was a three stage missile and it was designed to intercept targets outside the atmosphere. The main reason for this missile being developed was due to the dropping of the range restriction that had been imposed during 1956/7. By increasing the range, the missile could defend a much larger area which meant that fewer installations were required which provided some cost savings while still maintaining a defence.
The first stage was the same as that of Zeus A, but everything after that was new. The second stage had a slightly smaller diameter than the booster, while the third stage was slightly smaller again. The large fins that were so prominent on the Zeus A sustainer were gone, and replaced with small vanes at the top of the missile which provided some control while in the atmosphere. Once the missile had left the atmosphere control was obtained through the 3rd stage motor. Target destruction was obtained through the use of a nuclear warhead. This warhead was tested during 1962 at Christmas Island in the Pacific Ocean.
With the Nike-X ABM system, studies went into an extended range version of the Zeus B, and that missile was called Nike Zeus EX. It was renamed as Spartan when Nike-X was renamed as Sentinel in 1967.
U.S. Army
Dimensions
Length: 14.73m (48ft 4in)
Diameter: 0.91m (3ft)
Span: 2.44m (8ft)
Weight: 10,350kg (22,800lb)
Range: 400km (250 miles)
Ceiling: 280km (174 miles) - altitude obtained during ASAT test
1st Stage Motor: Thiokol TX-135 450,000lb thrust
2nd Stage Motor: Thiokol TX-238
3rd Stage Motor: Thiokol TX-239
Guidance: Radio command
Warhead: W-50 Thermonuclear, 400kt
First Firing: 28 April, 1960