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M42 or M-42 may refer to: In science: * Messier 42, a nebula also called the Orion Nebula * the 42nd Mersenne prime, 225964951-1, discovered in 2005 *an Y-chromosomal mutation, see Haplogroup B-M42 In transportation: * M-42 (Michigan highway), a state highway in Michigan * M42 motorway, a motorway in the United Kingdom * BMW M42, a 1989 automobile piston engine * Grand Central Terminal level M42, a World War II era sub-basement and power station * M42 (New York City bus), a New York City Bus route in Manhattan In photography: * M42 lens mount, a standard for cameras In firearms and military equipment: * Ag m/42, a Swedish semi-automatic rifle which saw limited use by the Swedish Army from 1942 until the 1960s * M42 Duster, a United States Army self-propelled anti-aircraft gun * M42 (gas mask), a United States military gas mask * M/42 (bicycle), a Swedish military bicycle * 45 mm anti-tank gun M1942 (M-42), a Soviet anti-tank gun (Motovilikha Plants) * Duperite M42 helmet, an Australian WWII helmet * M42 Stahlhelm, a type of German WWII helmet * M42, a Smith & Wesson hammerless revolver * M42 United Defense submachine gun, an American weapon used in World War II In manufacturing: * M42 is the Unified numbering system code ("miscellaneous nonferrous metals and alloys") for a grade of high speed steel with cobalt ==See also== * M1942 (disambiguation) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「M42」の詳細全文を読む スポンサード リンク
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