Belgian brewing company Duvel Moortgat and Firestone Walker Brewing will combine their operations in the US, while operating independently.
The companies have signed an agreement to this effect earlier this week.
Firestone Walker co-founders David Walker and Adam Firestone said: "The Firestone Walker and Duvel Moortgat families have combined forces to broaden their capacity and scope as brewers.
"The partnership will allow Firestone Walker to develop our capacity across the US in a conservative and thoughtful way by consummating a life long tie with this family-owned international craft brewer, who continue their commitment to participating in the American Craft Revolution."
The full-scale partnership between the companies will allow Firestone to increse its capacity in the US.
The estimated production capacity of Duvel Moortgat in the US will be 270,000 barrels this year, of which 200,000 will be brewed through Boulevard Brewing, which was bought by Duvel in 2013.
Meanwhile, Firestone Walker is expected to produce 275,00 barrels of beer this year.
The transaction is expected to be completed later this year.
