Hundreds of workers at the area's naval bases are being balloted on potential strike action over pay.
Unite the Union confirmed on Monday they are asking about 600 members working for Babcock Marine (Clyde) Ltd at Coulport and Faslane naval bases about industrial action.
Babcock offered a 7% pay increase, backdated to August 2023, and 3% for the next pay round from August 2024, said the union.
Unite said their members "emphatically rejected" the two-year pay offer by 99%. They said it amounted to a "substantial pay cut" compared to the rate of inflation of 9.1% last year.
The ballot for industrial action runs until June 11.
Unite general secretary Sharon Graham said: “Unite’s membership at Coulport and Faslane fully deserve a fair pay increase.
"Babcock Marine is a wealthy company that can easily afford to make a decent offer to its workers.
“Pay offers which in real terms amount to sizeable pay cuts, just won’t cut it. We will support our members’ fight for better jobs, pay and conditions all the way.”
In a statement, the union pointed out that Babcock Marine had raked in millions in profits in recent years.
James O’Connell, Unite industrial officer, added: “Babcock Marine need to get serious about its pay offer or face significant disruption as a result of industrial action.
“Babcock Marine must take the opportunity to make a decent offer, but they should be under no illusions as to the determination of our members to get what they deserve.”
A spokesperson for Babcock said: “We are disappointed that we have been unable to reach an agreement at this stage, however, we remain committed to ongoing engagement with Unite representatives to find a mutually acceptable resolution.”
The MOD has also been approached for comment.
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