The serial knife-wielding bandit struck again Monday — for the seventh time in Queens and the 24th time overall since March 1 — making off with $600 from a Subway restaurant in Far Rockaway, police said.

NYPD said the suspect, who is also wanted by police in Nassau and Suffolk counties, entered the fast-food sandwich shop at 233 Beach 20th St. at about 9:30 p.m. and took $600 from the cash register.

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Six other similar robberies have been committed in Queens since May 11, including another Subway on Sunday in Oakland Gardens, at 61-13 Springfield Blvd.

NYPD and local detectives think the same man has committed 17 such robberies on Long Island — 13 in Nassau and four in Suffolk. The FBI is assisting in the investigation.

The suspect in the pattern has been described as 25 years old, about 6 feet tall with a medium build, most often wearing a dark hooded jacket, blue jeans and tan work boots. He usually covers his face with dark sunglasses and a dark cloth, police said.

Witnesses have described him carrying a large butcher knife, which police have said is uncommon in this type of crime.

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The NYPD has dubbed the string of robberies citywide crime pattern 90, which began in Nassau County.