The FIAT 2000 was an Italian heavy tank of the First World War. It is considered the most advanced tank design of the period
The FIAT 2000 was a substantial vehicle, of comparable dimensions to the British Mark V tanks, and weighing 40 tons as compared to the Mark V's 28 tons.
The armour was of clean design, being made of riveted steel plates. It was 15 mm thick on the sides and 20 mm on the front.
Armament originally consisted of the turret mounted gun and ten machineguns (three on each side and four in front), but this left the rear of the tank undefended and tended to contaminate the interior with propellant fumes, so it was decided to install a ventilator in the roof and alter the machinegun positions to two on each side, three at the rear, and two in front.
Perhaps the most interesting feature of the tank's weaponry was the turret; apart from the Renault FT-17, this was the first tank to have a rotating turret mounted above the hull. The turret was made of four pieces rivetted together and had room enough for two crew members. Its weapon was a 65/17 howitzer (of 65mm caliber with a barrel 17 calibers long). Thanks to the tall turret and the space available beneath it, the gun's elevation was -10/+75°.