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((Short description|Tactical, Free fall, Nuclear Weapon))((More citations needed|date=September 2014))
[[File:Device_assembly_facility_inside_crop.jpg|right|thumb|300px|B57 nuclear bomb]]
The '''B57''' [[nuclear bomb]] was a [[tactical nuclear weapon]] developed by the United States during the [[Cold War]].

Entering production in 1963 as the '''Mk 57''', the bomb was designed to be dropped from high-speed tactical aircraft. It had a streamlined casing to withstand [[supersonic]] flight. It was 3 m (9&nbsp;ft 10 in) long, with a diameter of about 37.5&nbsp;cm (14.75&nbsp;in). Basic weight was approximately 227 [[kilograms]] (500&nbsp;lbs).

Some versions of the B57 were equipped with a parachute retarder (a 3.8 m/12.5&nbsp;ft diameter [[nylon]]/[[kevlar]] [[ribbon parachute]]) to slow the weapon's descent, allowing the aircraft to escape the blast (or to allow the weapon to survive impact with the ground in [[laydown]] mode) at altitudes as low as 15&nbsp;m (50&nbsp;ft). Various [[fuze|fuzing]] modes were available, including a [[hydrostatic pressure|hydrostatic]] fuze for use as a [[depth charge]] for anti-[[submarine]] use.

The B57 was produced in six versions (mods) with explosive yields ranging from 5 to 20 [[kiloton]]s. '''Mod 0''' was 5&nbsp;kt, '''Mod 1''' and '''Mod 2''' were 10&nbsp;kt, '''Mod 3''' and '''Mod 4''' were 15&nbsp;kt, and '''Mod 5''' was 20&nbsp;kt. The depth bomb version of the B57, for the [[U.S. Navy]], replaced the [[Mk 101 Lulu]] and had selectable yield up to 10&nbsp;kt.

The B57 used the [[Tsetse primary]] design for its core design, shared with several other mid- and late-1950s designs.

The B57 was produced from 1963 to 1967. After 1968, the weapon became known as the '''B57''' rather than the '''Mk 57'''. 3,100 weapons were built, the last of which was retired in June 1993.

The B57 could be deployed by most U.S. [[Fighter aircraft|fighter]], [[bomber]] and Navy antisubmarine warfare and patrol aircraft ([[S-3 Viking]] and [[P-3 Orion]]), and by some [[U.S. Navy]] [[helicopter]]s including the [[SH-3 Sea King]].<ref>((cite journal |last=Polmar |first=Norman |year=1983 |title=Tactical Nuclear Weapons |journal=[[Proceedings (magazine)|Proceedings]] |volume=109 |issue=7 |page=125 |publisher=[[United States Naval Institute]] ))</ref>  The B57 was also deployed with Canada's [[Canadair CF-104|CF-104s]] in Germany, and the [[Royal Air Force]]'s [[Hawker Siddeley Nimrod|Nimrod]] from [[RAF St Mawgan]] and [[RAF Kinloss]] in the United Kingdom and [[Malta]] in the Mediterranean.

==See also==
* [[Tsetse primary]]
* [[List of nuclear weapons]]

==References==
((reflist))

==External links==
* [http://nuclearweaponarchive.org/Usa/Weapons/Allbombs.html Allbombs.html list of all US nuclear weapons] at [http://nuclearweaponarchive.org nuclearweaponarchive.org]
* [http://thebulletin.metapress.com/content/26613570165t2883/?p=bd8073a6a670493e95bcea5c5a939b31&pi=14 Beware the old story] by Chuck Hansen, [http://www.thebulletin.org ''Bulletin of the Atomic Scientists''], March/April 2001 pp.&nbsp;52–55 (vol. 57, no. 02)
* [http://nuclear-weapons.info/o.htm A guide to British nuclear weapons] by Brian Burnell
*[https://www.youtube.com/watch?v=JH7T2dvcUmM Video showing shipboard handling procedures for the B57 bomb]

((United States nuclear devices))


[[Category:Cold War aerial bombs of the United States]]
[[Category:Cold War anti-submarine weapons of the United States]]
[[Category:Tactical nuclear weapons]]
[[Category:Nuclear bombs of the United States]]
[[Category:Depth charges]]
[[Category:Nuclear weapons of Canada]]
[[Category:Military equipment introduced in the 1960s]]

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