Ropes & Gray and Big Four Japanese firm Nishimura & Asahi are advising Bain Capital on its $634 million purchase of Japanese aircraft component manufacter, JAMCO Corporation, according to a person with knowledge of the deal.

JAMCO is being represented by another Big Four Japanese practice, Mori Hamada, with partners Katsumasa Suzuki, Takafumi Goto and Yusuke Kobayashi leading the deal team.