M42

M42 or M-42 may refer to:

In science:

• Messier 42, a nebula also called the Orion Nebula
• the 42nd known Mersenne prime

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 M42, a World War II era sub-basement and power station beneath New York's Grand Central Terminal train terminal

In photography:

• M42 lens mount, a standard for cameras

In firearms and military equipment:

• 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
• 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 grade of high speed steel with cobalt

See also

• M1942 (disambiguation)

This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.