Staff at the Solihull plant of a supplier to Jaguar Land Rover are being balloted for strike action.
Nearly 250 workers at International Automotive Components (IAC) are set to take part in the vote in a row over pay.
The factory, on Elmdon Trading Estate next to Birmingham Airport, produces dashboards and door, roof and boot interiors and is a major supplier to Jaguar Land Rover while BMW and chemical firm Ineos are also clients.
Trade union Unite is leading the ballot which closes on 25 September.
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Unite claimed most of the workers were paid the minimum wage and had previously rejected a six per cent pay increase which would have taken their hourly rate to £11.11.
Other staff, who Unite say are paid little more for their roles, have also rejected staggered offers of six, seven and eight per cent.
General secretary Sharon Graham said: "IAC pays its Solihull staff the bare minimum while bringing in hundreds of millions.
"It has the money to put forward a fair pay offer and that is what it needs to do. Our members at IAC have Unite's full backing and they will receive all the support they need."
Unite's regional officer Jason Richard added: "JLR, BMW and Ineos will not be pleased that they are facing disruption because IAC is paying staff poverty wages. The impact of any strikes will be particularly severe for JLR as IAC's main client.
"The dispute can be resolved without the need for industrial action but, for that to happen, IAC needs to put forward an offer our members can accept."
IAC, whose global headquarters is in Luxembourg, has been approached for comment.
