Over 1,000 workers in the PCS and Unite unions at IT giant Fujitsu were set to strike together on Monday 19 September.
The action will bring together three disputes involving workers providing vital IT support to a large number of projects across the public and private sectors.
PCS members working on contracts for five government departments are striking over a below-inflation pay offer.
They are also fighting the failure of Fujitsu to implement previous pay agreements.
Some workers receive just £13,500 a year.
Mark Serwotka, PCS general secretary, said, “Our members may work for Fujitsu but they are supporting essential public services.
“Ministers must recognise they have a responsibility for what happens on behalf of their departments.”
The strike will affect the Driver and Vehicle Licensing Agency, HM Revenue and Customs, Home Office, Ministry of Defence and Office for National Statistics.
Workers are expected to walk out at sites across Britain, including large workplaces in Telford, Merseyside and Swansea.
In Manchester workers voted to strike over a breakdown in industrial relations, breaches of agreements and victimisation of union reps.
Unite says that the company is breaking agreements covering issues including union recognition, pay, benefits, pensions, redundancy and redeployment.
Workers in Crewe are also set to strike again to defend victimised Unite rep Alan Jenney.
They previously struck for Alan’s reinstatement on 30 June, and marched with the hundreds of thousands striking to defend pensions on the day.
Fujitsu provides vital IT related services to many
organisations in both the public and private sector.
Some of these contracts include heavy financial penalties if agreed levels of service are not met.
Workers have the power to cause serious disruption—and coordinating their action will maximise its impact. If bosses refuse to back down, more strikes will be needed.
PCS and Unite have signed an agreement to cooperate.
This should include coordinating further action at Fujitsu alongside mass strikes in defence of public sector pensions.
To find out how you can support Fujitsu workers go to www.ourunion.org.uk