| M1 155 mm Long Tom | |
|---|---|
 Long Tom in travelling position, US Army Ordnance Museum | |
| Type | Towed field artillery |
| Place of origin | United States |
| Service history | |
| Used by | United States Italy Australia Greece Austria Japan Jordan South Korea Republic of China Turkey Pakistan Croatia South Africa United Kingdom Yugoslavia Netherlands |
| Wars | World War II Korean War Cambodian Civil War Croatian War of Independence |
| Production history | |
| Designed | 1918–1938 |
| Produced | 1940–1945 |
| No. built | 1,882 |
| Specifications | |
| Mass | Travel: 13,880 kg (30,600 lb) |
| Length | Travel: 11 m (36 ft 1 in)[1] |
| Barrel length | 6.97 m (22 ft 10 in) L/45 |
| Width | Travel: 2.5 m (8 ft 2 in)[1] |
| Height | Travel: 2.7 m (8 ft 10 in)[1] |
| Crew | 14 |
| Shell | Separate loading charge and projectile[1] |
| Caliber | 155 mm (6.10 in) |
| Breech | Asbury mechanism |
| Recoil | Hydro-pneumatic[1] |
| Carriage | M1 Carriage |
| Elevation | −2°/+65° |
| Traverse | 60° |
| Rate of fire | 40 rounds per hour |
| Muzzle velocity | 853 m/s (2,799 ft/s) |
| Maximum firing range | 23.7 km (14.7 mi) |
The 155 mm gun M1 was a 155 millimeter caliber field gun developed and used by the United States military. Nicknamed "Long Tom" (an appellation with a long and storied history in U.S. field and naval artillery), it was produced in M1 and M2 variants, later known as the M59. Developed to replace the Canon de 155mm GPF, the gun was deployed as a heavy field weapon during World War II and the Korean War, and also classed as secondary armament for seacoast defense. The gun could fire a 100 lb (45 kg) shell to a maximum range of 14 mi (23 km), with an estimated accuracy life of 1,500 rounds.
The Long Tom was also adopted by a number of other nations, including the United Kingdom, Austria, Israel, and the Netherlands.