A strike threat to Rosecroft Raceway ended last night and the harness track will open as scheduled at 8 o'clock tonight.

Members of the Retail Clerks Union, Local 692, voted, 124-61, to accept a contract similar to the one they rejected, 112-22, about two weeks ago.

The primary difference between the two contracts, according to sources, were pay equilization for security guards and management's agreement to pay a premium on weekdays if the 10-race card is not completed in 3 hours 10 minutes.

The one-year contract calls for an across the board pay increase of 10 percent or $3.25, whichever is greater.

Local 692 represents mutuel clerks, parking personnel and security guards at the track. The base pay of mutuel clerks had been $33 a night.

The Oxon Hill track's 85-night meeting is scheduled to run through June 21, with 10-race cards beginning at 8 p.m.

Meanwhile, federal mediator Donald Brodsky said tentative agreement had been reached between striking racetrack technicians and the American Totalisator Co., which services Bowie and other tracks. Bowie has continued to operate.

He said officials of the International Brotherhood of Electrical Workers, Local 1501, will recommend ratification of the three-year tentative pact.