title: M40
text: # M40
  
  M40 or M-40 may refer to:
  
  ## Transportation
  
  * M40 motorway, a motorway in England
  * M-40 (Michigan highway), a state highway in Michigan, US
  * M40 (Cape Town), a Metropolitan Route in Cape Town, South Africa
  * M40 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa
  * M40 (Pietermaritzburg), a Metropolitan Route in Pietermaritzburg, South Africa
  * Autopista de Circunvalación M-40, a motorway in Madrid, Spain
  * BMW M40, a 1987 automobile piston engine
  * Charomskiy M-40, an aircraft engine
  * Volvo M40 transmission, an automobile transmission
  
  ## Science
  
  * Messier 40 (M40), a double star in the constellation Ursa Major
  * the 40th Mersenne prime
  
  ## Firearms and military equipment
  
  * M40 field protective mask, a United States military gas mask
  * M40 rifle, a sniper rifle
  * M40 Gun Motor Carriage, a United States self-propelled artillery vehicle
  * M40 recoilless rifle, an anti-tank gun
  * M/40 Automatic cannon, a Swedish heavy machine gun
  * Macchi M.40, a prototype 1920s Italian catapult-launched reconnaissance seaplane
  * The incorrect designation for the SSh-40, a Russian infantry helmet
  
  ## Athletics
  
  * M 40, an age group for Masters athletics (athletes aged 35+)
  
  ## Technology
  
  * Samsung Galaxy M40, a smartphone
  