Video shows a crew of armed robbers lying in wait as a 64-year-old Bronx resident opens his apartment door — with one of them then bashing him over the head with a metal bar, according to cops. 

The suspects zip-tied and duct-taped the victim — as well as a 60-year-old woman who was in the West Bronx home at the time — while robbing the place before fleeing, authorities said.

The assailants struck at the home at Valentine and East Burnside avenues around 5:45 p.m. Thursday, police said.

Surveillance footage shows the victim opening his door and then getting smashed on the head with the bar before falling to the ground as the suspects rush into the apartment.

The crew also struck the man with a gun, cops said. 

The violent home-invaders then tied up the man and woman, police said. The relationship between the victims was not immediately clear.

The suspects removed a safe, an unspecified amount of cash, a purse and a backpack from the apartment while displaying guns, cops said. 

At least “several” of the suspects then fled the address in a red vehicle while another fled on foot toward East 180th Street and Valentine Avenue.

The man was taken to St. Barnabas Hospital for cuts on his head and face.