A Queens prisoner bolted from police custody — with handcuffs dangling from his wrist, cops said.

Police were arresting Alberto Sanchez around 8:30 p.m. Thursday for a domestic assault at 94th Street and 37th Avenue in Jackson Heights when he started resisting the officers, authorities said.

Suddenly, he took off, with the handcuffs latched onto only his right wrist, police said.

He remained at large Saturday, cops said. Police have launched an Internal Affairs investigation into how Sanchez managed to get away.