T-54-1 (Ob'yekt 137) or T-54 Model 1946 Produced 1946–1948.
With a streamlined turret and wide gun mantlet, similar to T-44, new V-54 engine, unstabilized D-10T 100 mm main gun, and two SG-43 machine guns in bins on the fenders.
Only a small number was built for trials that were a fiasco; as a result, the production of the T-54 series was halted until the implementation of modifications.

T-54-2 (Ob'yekt 137R) or T-54 Model 1949 – Produced 1949–1952.
It incorporated a number of improvements to the turret, as well a wider track (580 mm) and modernized transmission.
The turret is dome-shaped with flat sides (inspired by the IS-3 heavy tanks), similar to later T-54s but with a distinctive overhang at the rear.
The hull machine gun replaced the fender bin mounted ones.
It also had a shorter bustle.

T-54-3 (Ob'yekt 137Sh) or T-54 Model 1951 – Produced 1952–1954, in Poland 1956–1964.
Adopted the familiar, fully egg-shaped turret and new TSh-2-22 telescopic gunner's sight instead of the TSh-20.
Also, early T-54's lacked a snorkel.
The tank is also able to use its engine exhaust smoke system to create smokescreen by injecting vaporized diesel fuel onto the exhaust system.
This feature was continued throughout the entire T-54/T-55 series and was used in the T-62 series.

T-54A (Ob'yekt 137G) – Produced 1955–1957, in Poland 1956–1964, in Czechoslovakia 1957–1966, and in China as the Type 59.
Added STP-1 "Gorizont" vertical-plane gun stabilizer to D-10T tank gun and this new weapon was designated D-10TG.
Originally had a small muzzle counter-weight, which was later replaced with a fume extractor.
Also introduced were the OPVT wading snorkel, the TSh-2A-22 telescopic sight, the TVN-1 infrared driver's periscope and IR headlight, the new R-113 radio, a multi-stage engine air filter and radiator controls for improved engine performance, an electrical oil pump, bilge pump, automatic fire extinguisher and extra fuel tanks.

T-54B (Ob'yekt 137G2) – Produced from 1957 to 1958.
It is armed with the D-10T2S tank gun with STP-2 "Tsyklon" 2-plane stabilization.
From 1959, infrared night-fighting equipment was added: L-2 "Luna" infrared searchlight, TPN-1-22-11 IR gunner's day-and-night sight, OU-3 IR commander's searchlight.
NATO code: T-54(M).

T-54K1, T-54K2, T-54AK1, T-54AK2, T-54BK1, T-54BK2, T-54MK1, T-54MK2 were command tanks corresponding to the main production models, with extra communications equipment at the expense of 5 tank rounds.
K1 version had a second R-113 (or R-123) radio for company commanders, K2 version had 10 m semi-telescoping antenna mast, for battalion and regimental commanders, and regimental chiefs-of-staff.
They were also equipped with the TNA-2 navigational system and AB-1-P/30 reloading device.
T-54-1 (Ob'yekt 137) or T-54 Model 1946 Produced 1946–1948. With a streamlined turret and wide gun mantlet, similar to T-44, new V-54 engine, unstabilized D-10T 100 mm main gun, and two SG-43 machine guns in bins on the fenders. Only a small number was built for trials that were a fiasco; as a result, the production of the T-54 series was halted until the implementation of modifications.
T-54-2 (Ob'yekt 137R) or T-54 Model 1949 – Produced 1949–1952. It incorporated a number of improvements to the turret, as well a wider track (580 mm) and modernized transmission. The turret is dome-shaped with flat sides (inspired by the IS-3 heavy tanks), similar to later T-54s but with a distinctive overhang at the rear. The hull machine gun replaced the fender bin mounted ones. It also had a shorter bustle.
T-54-3 (Ob'yekt 137Sh) or T-54 Model 1951 – Produced 1952–1954, in Poland 1956–1964. Adopted the familiar, fully egg-shaped turret and new TSh-2-22 telescopic gunner's sight instead of the TSh-20. Also, early T-54's lacked a snorkel. The tank is also able to use its engine exhaust smoke system to create smokescreen by injecting vaporized diesel fuel onto the exhaust system. This feature was continued throughout the entire T-54/T-55 series and was used in the T-62 series.
T-54A (Ob'yekt 137G) – Produced 1955–1957, in Poland 1956–1964, in Czechoslovakia 1957–1966, and in China as the Type 59. Added STP-1 "Gorizont" vertical-plane gun stabilizer to D-10T tank gun and this new weapon was designated D-10TG. Originally had a small muzzle counter-weight, which was later replaced with a fume extractor. Also introduced were the OPVT wading snorkel, the TSh-2A-22 telescopic sight, the TVN-1 infrared driver's periscope and IR headlight, the new R-113 radio, a multi-stage engine air filter and radiator controls for improved engine performance, an electrical oil pump, bilge pump, automatic fire extinguisher and extra fuel tanks.
T-54B (Ob'yekt 137G2) – Produced from 1957 to 1958. It is armed with the D-10T2S tank gun with STP-2 "Tsyklon" 2-plane stabilization. From 1959, infrared night-fighting equipment was added: L-2 "Luna" infrared searchlight, TPN-1-22-11 IR gunner's day-and-night sight, OU-3 IR commander's searchlight. NATO code: T-54(M).
T-54K1, T-54K2, T-54AK1, T-54AK2, T-54BK1, T-54BK2, T-54MK1, T-54MK2 were command tanks corresponding to the main production models, with extra communications equipment at the expense of 5 tank rounds. K1 version had a second R-113 (or R-123) radio for company commanders, K2 version had 10 m semi-telescoping antenna mast, for battalion and regimental commanders, and regimental chiefs-of-staff. They were also equipped with the TNA-2 navigational system and AB-1-P/30 reloading device.
T-54/T-55 operators and variants