IS-4

IS-4
An IS-4 at the Kubinka Tank Museum
Type	Heavy tank
Place of origin	Soviet Union
Service history
Used by	Soviet Union
Production history
Designed	1944
Produced	1946-1949
No. built	200[1]-<250[2]
Specifications
Mass	117,000 lb (53,000 kg) (Combat)
Length	9.70 m (31.8 ft)
Width	3.26 m (10.7 ft)
Height	2.48 m (8 ft 2 in)
Crew	4 (Driver, Commander, Loader, Gunner)
Main armament	1x D-25T 122 mm gun (22 rounds)[3]
Secondary armament	2 x 12.7mm DShK (1,000 rounds) [4]
Engine	V-12[3][2] Diesel 750 hp[2] @2,100 RPM
Power/weight	13hp/ton
Suspension	Torsion bar suspension
Fuel capacity	410 L (90 imp gal; 110 US gal) (295/115 internal)[3] 360 L (79 imp gal; 95 US gal) (4 external tanks)[3]
Operational range	100 km (62 mi)-170 km (110 mi)100 km (62 mi)
Maximum speed	43 km/h (27 mph)
Steering system	Speeds: 6 forward,[2] 2 reverse[2]
References	[5]

The IS-4, also known as the Object 701, was a Soviet heavy tank that started development in 1943 and began production in 1946. Derived from the IS-2 and part of the IS tank family, the IS-4 featured a longer hull and increased armor. With the IS-3 already in production, as well as the decreased need for tanks (particularly heavy tanks) and sluggish mobility, many were sent to the Russian Far East with some eventually becoming pillboxes along the Chinese border in the 1960s. Fewer than 250 were produced.