Members of the Prospect civil service workers union at Babcock’s Rosyth dockyard have voted overwhelmingly in favour striking in their dispute over pension cuts.
The 550 workers voted 73 percent in favour of strike action.
Prospect was set to call the first of a series of strikes in early August, followed by a work-to-rule and further strike action later in the month.
The GMB, Ucatt, and the Amicus and T&G sections of the Unite union are the other unions at the yard.
They have also been balloting and are also expected to take part in the action.
The dispute is over Babcock’s imposition of a series of changes to the dockyard pension scheme, including a 4.5 percent increase in pension contributions, cuts in pensionable pay and an increase in the retirement age to 65.
Workers held an unofficial walkout over the attacks in June.