St Marys and Mount Druitt teachers will protest for two hours outside Chifley College's Mount Druitt campus this Thursday after the department blocked a teacher's right to a service transfer.

Darija Egic, who is six months pregnant, has been told not to apply for a Cumberland High School job, which would be closer to home, despite clocking up priority transfer points.

She has taught at the Mount Druitt campus for six years.

The department previously stated that priority transfers will be protected under the new agreements.

But teachers say the priority transfer system has been abolished and provides little incentive for teachers to work in hard-to-staff areas such as Mount Druitt.

It comes after threats of a strike at Whalan Public School last Thursday when the department blocked the school's deputy principal from a vacancy post at Samuel Gilbert Public School, in Castle Hill.

The department overturned its original decision after threats of industrial action.

NSW Teachers Federation organiser Henry Rajendra has high hopes for next Thursday's strike.

``I'm getting the feeling from schools that this strike will be well-supported,'' he said. ``Hundreds of teachers are expected to converge outside Mount Druitt Campus. This will be a strong show of commitment, support and solidarity. We'll put the new education minister [Verity Firth] on notice.''

Meanwhile, almost 50 Mount Druitt TAFE teachers expressed their concern about pay and staffing conditions when they blocked traffic from entering the campus for an hour last Wednesday.

They were angry about current pay conditions and the drop of teacher qualification standards. Teachers fear the downgrade of TAFE teaching qualifications will be passed onto primary and secondary schools.