M42

All you want to know about M42

M42 or M-42 may refer to:

In science:

Messier 42 (M42), 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 Yorks Grand Central Station 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
M42 Stahlhelm, a type of German WWII helmet
M42, a Smith & Wesson hammerless revolver

In manufacturing:

M42 grade of high speed steel with cobalt

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