Shocking video shows the moment a thug kicks a Bronx hardware store worker in the chest, causing him to fall back, strike his head on the pavement and lose consciousness.

The suspect walked into J and A Hardware at 980 Longwood Ave. about 2:20 p.m. Sept. 25, briefly spoke to the 67-year-old worker and then starting to knock items off the shelves, police said.

The store employee asked the suspect to leave, leading to an argument that turned physical.

In the surveillance footage, the worker – clad in red shirt and blue jeans — is seen struggling with the suspect before an accomplice in a yellow shirt jump-kicks him in the chest.

He instantly blacks out after falling backward and hitting his head as the two suspects take off running east on Longwood Avenue.

The victim suffered a fractured orbital socket and abrasions to the back of the head. He was taken to NYC Health + Hospitals/Lincoln in serious but stable condition.

The owner of a pizza joint next door said the two teens had entered his business earlier and swore at his workers.

“The kids they came here and they start to touch the food and they touching the beef patties and the chips, yeah tried to looking for trouble,” Milton Javier told WABC.

Anyone with information is asked to call the NYPD’s Crime Stoppers Hotline at 1-800-577-TIPS (8477). The public can also submit tips by logging onto WWW.NYPDCRIMESTOPPERS.COM or on Twitter @NYPDTips.