M46

M46 or M-46 may be:

M46 Patton tank, circa 1949
Open Cluster M46, a Messier object and open cluster in the Puppis constellation discovered in 1771
Volvo M46 transmission, a four-speed gearbox with electric overdrive, used in new cars from 1975 through 1991. Gear ratios were: 4.03:1, 2.16:1, 1.37:1, 1.00:1, 0.79:1 (overdrive).

M46 motorway, a hypothetical new motorway between the M1 and the M5 in the United Kingdom, roughly following the line of the A46
Michigan State Highway 46