More than 30 workers at Renold Hi-Tec Couplings, Parkinson Lane, Halifax, walked out for 24 hours due to the imposition of a pay freeze.
They were on strike until 7.30 am today.
The Unite union said that the company, which makes high-tech couplings for the engineering sector, made £7 million profit the year before.
Regional officer Simon Coop said: “Our members don’t believe that the company is in financial difficulties as they are working just as hard and orders are piling up – something does not add up.
“Our members have voted strongly for strike action as they feel a pay freeze for 2013/14 is unjust and unfair.”
He said he hoped the company would talk to union representatives and if necessary involve the conciliation service, Acas.
“But more strikes in the New Year are on the cards, if we can’t resolve this dispute,” said Mr Coop.