Nine craft workers at the Central Bank's Mint, where bank notes and coins are produced, will begin a work-to-rule on Monday in a dispute over pay.

They have threatened to escalate their action to an all-out strike if the row is not resolved. 

The workers, who do electrical and mechanical maintenance, belong to Unite and the Technical Engineering and Electrical Union. 

It is understood that the dispute arose when the Central Bank appointed two new employees who already met experience criteria without putting them on a lower starter rate.

Other more experienced technicians are now seeking an increase estimated at around 7% to maintain the pay differential between the new appointees and the longer-serving staff. 

Members of Unite and the TEEU are set to begin their work to rule on Monday 27 June, because they allege that the Central Bank has refused to engage meaningfully on their pay claim. 

However, Unite has warned that if the dispute is not resolved, the members will hold one-day strikes on 11 and 12 July, and will commence an all-out strike on 18 July. 

Unite official Willie Quigley said members were frustrated and felt they had no alternative but to go the industrial action route. 

It is understood that talks will take place at the Workplace Relations Commission in the morning in a bid to head off the industrial action. 

In a statement, the Central Bank said it "confirms that it has been advised of proposed industrial action by nine staff who work in the Bank’s Sandyford site, represented by the TEEU and Unite trade unions.

"The Workplace Relations Commission have responded to the Central Bank’s request for an urgent conciliation conference with Unite and the TEEU. This will take place tomorrow Friday 24th June," it added.