M40

M40 or M-40 may refer to:

In transportation:

• M40 motorway, a motorway in England
• M-40 (Michigan highway), a state highway in Michigan, US
• 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

In science:

• Messier 40 (M40), a double star in the constellation Ursa Major
• the 40th Mersenne prime

In 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

See also

• 40M (disambiguation)