In the 2nd half of 1957 at the suggestion of Chief the Armored troops of the Soviet Army Colonel General P.P. Poluboyarova suggested that a new tank be developed on the basis of the Object 140 but uses the chassis of the T-54B to ensure maximum part compatibly. The tank was designed at factory №183 under the leadership of Leonid Karcev. One prototype was built and underwent testing in the fall of 1958.
The Object 142 was armed with the 100mm D-54TS. The tank contained 50 rounds of ammunition for the main gun. The D-54TS was two plane stabilized with the “Blizzard” stabilizer. The gun was aimed with a TSH2A telescopic sight while night sighting was used with the TPN-1. Gun traverse of the main gun was -5 to 16 degrees. Unlike the Object 140 the Object 142 lacked a mechanism for spent shell ejection. Due to removing the AA gun that was on the Object 140 spaced was freed up for more ammunition (3,500 rounds) for the 7.62mm SGMT machine gun. The armor layout was mostly the same as the Object 140.
The Object 142 was powered by the 580hp B-55. Top speed was 50km/h. The transmission was essentially that of the T-54B. Most of the parts from the Object 142 power system were taken from the Object 140 except for the heater and fuel tanks. The Object 142 carried 715 liters of fuel plus 285 on external tanks. This gave the Object 142 a range of 500km.
The Object 142 was canceled with the start the start of production of the T-55 at Factory №183 and research being undertaken to improve the fighting capability of the T-55.While the Object 142 was short lived it did form the basis for the T-62A and thus the T-62. The Object 142 would mark the start of Nizhny Tagil's move to improve tank capability of it's future tanks with older ones. It should be noted that the Object 142 is commonly misidentified as the T-62A, you can tell the difference by seeing if it has a Object 142 turret and hull.